IM 660-3.book - McQuay International Home Page
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1. Document number WSHP unit model IM 407 Vertical WSHP 007 to 060 IM 439 Large Vertical WSHP 070 to 290 IM 447 Console Units WSHP IM 494 WMH CWH 007 to 019 IM 526 Horizontal WSHP 007 to 120 IM 544 CCH HWH 006 to 060 IM 656 Horizontal WSHP 019 to 060 IM 742 Enfinity Horizontal WSHP 007 to 060 IM 778 Enfinity Vertical WSHP 007 to 060 50 Hz only Electric shock hazard Can cause equipment damage personal injury or death Properly ground equipment Connections and service to the MicroTech WSHP controller control panel must be performed only by personnel knowledgeable in the operation of the equipment being controlled Moisture in the control panel can cause personal injury and improper equipment operation When servicing this equipment during rainy weather or high humidity conditions protect the electrical components in the main control panel Temperature hazard Can cause damage to system components The controller is designed to operate in ambient temperatures from 32 F to 140 F O C to 60 C and in relative humidity up to 95 noncondensing The controller can be stored in ambient temperatures from 40 F to 176 F 40 C to 80 C and in relative humidity up to 95 noncondensing Z CAUTION Properly commission page 6 the water source heat pump before using for temporary heating or cooling Failure to properly commission can cause equipment damage not covered by2. 00 0 een 3 Diagnostic Service 10 Brownout Alarm 0 eA 3 A PEE Unit Identification Wink Command s s 10 High Pressure Refrigerant Alarm 0005 3 Alarm Monitoring and Control 10 Low Temperature Refrigerant Alarm liuius 3 qm ME MEME NIRE 10 Low Pressure Refrigerant Alarm l l esses 3 Alarm Fault Descriptions C gap ew gt ge DEL dE 10 Chess Fitar Natiiestion neni ile Phy a een 3 E Configurable Relay Outputs 4 Low Temperature Fault o n nuenian 10 Boilerless System Auxiliary Heat Relay LonWorks only 4 Low Pressure Faults 00 eee eeeeuee 11 Boilerless System Auxiliary Heat Relay LonMark only 4 Condensate Overflow Fault 4 11 MotorizeD Valve Relay 0 0 0 0 0c eee nenn 4 Brownout Fault is su savy ety ewan vanes nea ay 11 Fresh Air Damper Relay 0 0 0 0 e eee ee 4 Change Filter Notification network units only 11 Timed Output Relay LonWorks only sus gi eat es dod Service Information ooo cocos 12 Interface Features Luuueuues 5 Inputs and Outputs 22222222 sense 12 MicroTech Network sleseeeee eh 5 Analog Inputs e eher 12 Wall Mounted Sensor 000 cece eee eee eee 5 Digital Outputs 0 2 EA yA 12 Remote Room Set Point Adjustment 5 Input Output Tables llis eee eee 12 Tena
3. Installation and Maintenance IM 660 3 Group WSHP Part Number 106018961 Date May 2005 MicroTech 2000 Water Source Heat Pump Unit Controller 2 ce EXT 59s Alice l f err N 2 Ai 23 Tries u a Tie Jum LS 5 Mos 2005 McQuay International Air Conditioning Contents Introduction ssuuu usse 1 Description of Operation 8 General Information sss 2 Fan Operation rres hoai mi ag ae ne 8 Component Data sss eee 2 Unoccupied Operating Mode cene aama iiine gies meane 5 Microprocessor 2 Cooling Operation 0 0 eee eese 8 Yolow Slate LED LLL Heating Operation iss eee 8 Savice A 2 Occupied Operating Mode lisse eee eee eee 8 Red Service LED yo file Rg hod ee PU ER 2 Cooling Operation 0 cee eee eee 8 Temperature Sensing did M ae te wg BEN 2 Heating Operation lssleeeele esee 8 TRUE TATE aie Pai e as Vi ELE Holding Mode 06 ese see RR Rer ea 9 Standard Control Features 3 Tenant Override Mode n n aaan 0c cece cece eee ee 9 Compressor Short Cycle Protection 3 Load Shed Mode LonWorks only 0 000 eee 9 Random Start Zu obo ERR ee 3 Optimal Start LonWorks only o ocoococococoo oo 9 Delayed Reversing Valve De energization 3 ao E HOD Sa ee ED ie co ee ed 9 Condensate Overflow Alarm
4. The software disables normal unit operation until the fault condition is manually corrected Condensate Overflow Fault The Condensate Overflow fault indicates that the condensate overflow sensor J4 14 sensed a grounded signal while the controller was calling for the compressor to run For information on troubleshooting analog input faults see Test Procedures on page 12 Effects The compressor immediately de energizes The software disables normal unit operation until the fault condition is manually corrected Brownout Fault The Brownout fault indicates the water source heat pump is sensing low voltage levels It is designed to protect the compressor and contactors from low line voltage or brownout conditions Diagnostic Service The controller is programmed with a brownout set point that corresponds to 8246 of the water source heat pump s nameplate line voltage value If the water source heat pump controller senses a voltage level less than its set point for more than 1 second it triggers the brownout fault The fault resets automatically when the sensed voltage remains at or above a level corresponding to 90 of the nameplate value for a period of 1 second For information on troubleshooting this alarm see Test Procedures on page 12 Effects as applicable The compressor immediately de energizes Change Filter Notification network units only The Change Filter notification
5. Auto manual and occupied unoccupied fan control Mode fault system schedule and set point operation Compressor starts and fan run hours Load shed level LONWORKS only Tenant override status In addition the following unique operation and maintenance parameters can display for each unit Leaving water temperature Return air temperature set point wall sensor adjustment Adaptive optimal start LONWORKS only Occupied unoccupied on cycle fan mode Room temperature warning Filter changes from fan hours Compressor management on off differential minimum off time minimum on time Communications Failure LONWORKS If the network communication link fails for any reason the affected WSHP controller remains operational Its operating mode will be the last received over the network unless power is cycled and then it defaults to occupied Its minimum position heating and cooling set points will be those last received over the network regardless of whether power is cycled Communications Failure LONMARK If the network communication link fails for any reason the affected WSHP controller remains operational The status of its heating and cooling set points as well as its occupancy and other network adjustable settings depends upon whether the BAS is using LONWORKS bindings with associated heartbeats Wall Mounted Sensor There are four optional wall sensor packages available All include a remote s
6. section terminals J41 and J42 see unit wiring diagram If the voltage at these terminals is less than 19 68 VAC for at least 1 second the brownout fault occurs The fault automatically clears if the voltage at the terminals remains greater than 21 6 VAC for at least 1 second If a brownout fault occurs check the line voltage to the water source heat pump If it is less than 82 of the nameplate value contact the power company If the line voltage remains greater than 90 of the nameplate value for more than 1 second but the fault does not reset perform the following procedure 1 Measure the voltage between terminals J41 and J42 on the WSHP controller If the voltage is low or fluctuates around 19 68 VAC the WSHP controller is functioning properly Go on to step 2 If the voltage remains above 21 6 VAC for 1 second but the fault does not reset the WSHP controller is defective N A Check the primary and secondary voltages of the power supply transformers al Check for faulty wiring or connections throughout the power supply circuit WSHP Controller Replacement Data relating to the water source heat pump controller configuration and characteristics are stored at the factory when each unit is built and tested If a WSHP controller is defective and must be replaced its unit specific software defined by the above data must be loaded into the replacement controller at the factory To do this the factory needs th
7. 162 27 0 9165 81 73 0 1584 163 14 McQuay IM 660 3 McQuay IM 660 3 McQuay IM 660 3 McQuay Training and Development Now that you have made an investment in modern efficient McQuay equipment its care should be a high priority For training information on all McQuay HVAC products please visit us at www mcquay com and click on training or call 540 248 9646 and ask for the Training Department This document contains the most current product information as of this printing For the most up to date product information please go to www mcquay com McQuay Air Conditioning 2005 McQuay International e www mcquay 800 432 1342 05 05
8. 24 V ground 6 4 464 21 40 0 5326 104 J4 2 24 VAC 5 4 234 23 41 0 5116 106 J4 3 Fan relay output 4 4 017 25 42 0 4916 108 J4 4 Fan relay common 3 3 812 27 43 0 4725 109 J4 5 Compressor contactor output 2 3 620 28 44 0 4543 111 J4 6 Compressor contactor common 1 3 438 30 45 0 4368 113 J4 7 Reversing valve solenoid output 0 3 266 32 46 0 4201 115 J4 8 Reversing valve solenoid common 1 3 104 34 47 0 4041 117 J4 9 High pressure switch signal 2 2 951 36 48 0 3888 118 J4 10 Low pressure switch source 3 2 806 37 49 0 3742 120 J4 11 Low pressure switch signal 4 2 669 39 50 0 3602 122 J4 12 Low temperature switch signal 5 2 540 41 51 0 3468 124 J4 13 Low temperature switch source 6 2 418 43 52 0 3340 126 J4 14 Condensate overflow sensor 7 2 302 45 53 0 3217 127 J5 8 Leaving water temperature sensor input 8 2 192 46 54 0 3099 129 J5 9 Leaving water temperature sensor common 9 2 089 48 55 0 2987 131 J5 10 Discharge air temperature sensor input 10 1 990 50 56 0 2878 133 J5 11 Discharge air temperature sensor common 11 1 897 52 57 0 2775 135 J6 1 7 Auxiliary module connections 12 1 809 54 58 0 2675 136 13 1 726 55 59 0 2580 138 14 1 647 57 60 0 2489 140 15 1 571 59 61 0 2401 142 16 1 500 61 62 0 2317 144 17 1 432 63 63 0 2236 145 18 1 368 64 64 0 2158 147 19 1 307 66 65 0 2084 149 20 1 249 68 66 0 2012 151 21 1 194 70 67 0 1944 153 22 1 142 72 68 0 1878 154 23 1 092 73 69 0 1814 156 24 1 045 75 70 0 1753 158 25 1 000 77 71 0 1695 160 26 0 9572 79 72 0 1638
9. holding the tenant override button for 1 0 to 6 0 seconds puts the unit into tenant override mode for a set time period default 60 minutes Press the tenant override button again for 1 0 to 6 0 seconds and the unit returns to unoccupied mode by default A separate configuration property is available that allows users to extend the tenant override period up to 60 minutes with a second button press Except for the fact that it is temporary the Tenant Override operating mode is identical to the Occupied operating mode LONWORKS only Pressing and holding the tenant override button for at least 6 0 seconds but not more than 10 seconds activates the network query address mode indicating the unit address in question at the MicroTech gateway panel LONWORKS only Pressing and holding the tenant override button more than 10 seconds activates the network self configure mode requesting the assignment of the next sequential address from the MicroTech gateway panel LONMARK only Similar to pressing the service pin pressing and holding the tenant override button for more than 10 seconds causes the Neuron chip to broadcast a message over the Lon network containing its unique 48 bit Neuron ID This is useful during network commissioning Description of Operation Load Shed Mode LoNWoRks only When the network load shed level is less than or equal to the load shed threshold setting in the unit load shedding is activated The amount the con
10. in Table 9 on page 12 The discharge air temperature sensor is located at the inlet to the fan The leaving water temperature sensor is located in the leaving water line McQuay IM 660 3 Standard Control Features Standard features of the MicroTech 2000 WSHP control include Heating and cooling control from a room sensor Monitoring of all equipment protection controls Fan and compressor operation Monitoring of discharge air temperature Monitoring of leaving water temperature e Status of all vital unit functions Optional control outputs Additional standard features of the MicroTech 2000 control are provided below Compressor Short Cycle Protection When a compressor is energized it remains energized for at least 2 minutes before the temperature control sequence is allowed to de energize it An alarm condition can override this minimum on timer and stop the compressor if necessary When a compressor is de energized it remains de energized for at least 5 minutes before the temperature control sequence is allowed to energize it again Random Start The random start feature prevents simultaneous compressor startup that could otherwise occur after the following events Unit powerup Unoccupied to occupied changeover Brownout condition The compressor start delay can be from 5 to 37 seconds and is determined by the unique 48 bit Neuron chip ID Delayed Reversing Valve De energization This feat
11. outputs The MicroTech 2000 WSHP auxiliary board typically is factory mounted only in 2 compressor circuit WSHP units Only three relay outputs are available for use as configurable relay outputs in 2 circuit WSHP units All configurable relay outputs are set to no function by default and must be field configured A description of the four relay options follows Boilerless System Auxiliary Heat Relay LONWORKS only The relay receives loop water temperature input from the MicroTech Loop Water Controller through the gateway panel and provides relay output to electric heat on a call for heat after loop temperature falls Boilerless System Auxiliary Heat Relay LoNMARK only The relay output energizes when the space temperature reaches the heating set point and de energizes when the space temperature exceeds the heating set point plus a configurable differential set point defaulted to 3 F Motorized Valve Relay The relay provides output to the motorized valve to shut off water through the unit when the compressor is not operating Fresh Air Damper Relay The relay provides output to the open damper whenever the fan is operating in the occupied cycle Timed Output Relay LONWoRks only The relay provides output to an auxiliary load to control its operation based on a specific time schedule different from that of the heat pump unit Figure 1 First control signal output Terminal boards located externally on the WSHP chas
12. warranty Static sensitive components Static discharge while handling electronic circuit boards can cause damage to the components Discharge any static electrical charge by touching the bare metal inside the main control panel before performing any service work Never unplug cables circuit board terminal blocks relay modules or power plugs while power is applied to the panel This equipment generates and uses radio frequency energy If not installed and used in accordance with this manual it can cause interference to radio communications It has been tested and found to comply with the limits for a Class B digital device pursuant to part 15 of the FCC rules Operation is subject to the following conditions 1 This device may not cause harmful interference 2 This device must accept any interference received including interference that may cause undesired operation These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment Operation of this equipment in a residential area is likely to cause harmful interference in which case users are required to correct the interference at their own expense McQuay International disclaims any liability resulting from any interference or for the correction thereof McQuay IM 660 3 General Information The MicroTech 2000 WSHP unit controller provides control of McQuay and AAF wa
13. Cooling Operation The fan energizes and the reversing valve de energizes when the space temperature rises to the UCS set point see note below If the reversing valve was previously energized the compressor energizes after a 10 second delay If the reversing valve does not change state the compressor is energized immediately Once the compressor energizes the start to stop minimum timer overrides normal temperature control and keeps it energized for at least 2 minutes fixed The compressor de energizes when the space temperature falls below the UCS set point to a minimum temperature of UCS DIFF The fan also de energizes when the space temperature falls below the UCS set point however controller code prevents the fan from stopping until 12 seconds after the compressor stops Note During normal non alarm operation the compressor is disabled if the stop to stop minimum off timer has not expired 5 minutes fixed Heating Operation The fan and reversing valve energizes when the space temperature falls to the UHS set point see note below If the reversing valve was previously de energized a time delay of approximately 10 seconds must expire before the compressor energizes Once the compressor energizes the start to stop minimum on timer overrides normal temperature and keeps it energized for at least 2 minutes fixed The compressor de energizes when the space temperature rises above the UHS set point to a maxim
14. Electrical Shock Hazard Can cause severe injury or death Failure to bond the frame of this equipment to the building electrical ground with the grounding terminal provided or other acceptable means can result in electrical shock Service must be performed only by qualified personnel ZA CAUTION Before applying power to any unit closely follow the pre start procedures in the model specific installation literature See Table on page 1 Pre Start Required tools and literature The following tools and additional literature may be required to properly commission a MicroTech 2000 Water Source Heat Pump Controller Tools Digital voltmeter Digital ohmmeter Digital thermometer General technician s tools PC equipped with Monitor software Network Water Source Heat Pumps only Literature Model specific water source heat pump installation bulletin See Table 1 on page 1 Program specific sequence of operation bulletin MicroTech Monitor Program User s Manual if PC is used Water Source Heat Pump Identification Although the water source heat pumps look similar there are significant internal differences that are defined by the model number code string In addition to the basic heating and cooling equipment the model number code string specifies which factory configured options are provided These options determine the internal wiring configuration and the field wiring requirements It is
15. d heating set point 60 F 16 C 35 F to 120 F 1 7 C to 49 C Unoccupied cooling set point 85 F 29 C 35 F to 120 F 1 7 C to 49 C Fan unoccupied Cycle On cycle Tenant override 1st press 1 00 Off 0 30 to 8 00 Tenant override 2nd press Off Off 0 30 to 8 00 Differential 2 1 2 C 1 F to 10 0 6 C to 5 6 C Auto Manual Auto Manual occupied unoccupied fan only off Next filter change hours 600 100 to 5000 Clock schedule 1 Up to 32 Load shed start level Off Off 1 to 7 Tenant set point adjustment Off OF 0 C Off on 3 F to 1 7 C Low temperature warning 55 F 13 C 35 F 1 7 C high not used High temperature warning 95 F 35 C 120 F 49 C low not used McQuay IM 660 3 7 Description of Operation Fan Operation When the unit is in heating or cooling mode the fan is on When a compressor is running the fan is on In the unoccupied mode if the fan unoccupied set point is on not cycle or if a compressor is running the fan remains on In the occupied mode if the fan occupied set point is on not cycle the fan is always on If the set point is heat cycle cool on the fan cycles with the compressor in heating and is on continuously in cooling Unoccupied Operating Mode The descriptions below assume that the factory default unoccupied fan setting is used and the fan cycles with the compressor If the unoccupied fan setting is adjusted to ON the fan runs continuously
16. disabled if the stop to stop minimum off timer has not expired 5 minutes fixed Heating Operation The reversing valve energizes when the space temperature falls to the OHS set point see note below If the reversing valve was previously de energized the compressor energizes after a 10 second delay Once the compressor energizes the start to stop minimum on timer overrides normal temperature and keeps it energized for at least 2 minutes fixed The compressor is de energized when the space temperature rises above the OHS set point to a maximum temperature of OSHS DIFF The fan is also de energized when the space temperature rises above the OHS set point however the controller code prevents the fan from stopping until 12 seconds after the compressor stops Note During normal non alarm operation the compressor is disabled if the stop to stop minimum off timer has not expired 5 minutes fixed McQuay IM 660 3 Holding Mode If the unit comes out of the heating or cooling modes into the holding mode the compressor de energizes after the 2 minute timer expires The unit must stay in the holding mode with the compressor off for 30 seconds before it is allowed to go into the heating or cooling states During this time the reversing valve is not allowed to switch states Tenant Override Mode A wall mounted tenant override switch is available for use with all MicroTech 2000 WSHP unit controllers Pressing and
17. e following information Full model number Serial number Date code for time of manufacture Software version of code loaded in the controller The unit model and serial numbers are listed on the unit dataplate The date code and software version of code are printed on the MicroTech unit controller adhesive backed label This information must be included with the replacement WSHP controller part order McQuay IM 660 3 Service Information Table 10 Inputs and outputs for WSHP units Table 11 Thermistor chart Connection Component description C 10 k ohm F C 10 k ohm F J1 1 TB 2 E Remote digital source 18 8 654 0 28 0 8777 82 J1 2 TB 2 L Remote digital signal 17 8 173 1 29 0 8408 84 J1 3 TB 2 U Spare relay normally closed 16 7 722 3 30 0 8056 86 J1 4 TB 2 P Spare relay common 15 7 298 5 31 0 7721 88 J1 5 TB 2 C Spare relay normally open 14 6 900 7 32 0 7402 90 J2 6 TB 1 1 Room sensor LED 13 6 526 9 33 0 7098 91 J2 7 TB 1 2 Tenant override 12 6 175 10 34 0 6808 93 J2 8 TB 1 3 Room sensor input 11 5 845 12 35 0 6531 95 J2 9 TB 1 4 Room sensor common 10 5 534 14 36 0 6267 97 J2 10 TB 1 5 LonTalk connection 9 5 242 16 37 0 6015 99 J2 11 TB 1 6 LonTalk connection 8 4 967 18 38 0 5774 100 J2 12 TB 1 7 24 VAC common 7 4 708 19 39 0 5545 102 J41
18. e match the WSHP controller may require factory service or it may be defective 6 If the measured resistance and temperature do not match either there is a wiring problem or the sensor is defective Check the wiring connection and the sensor circuit wiring for defects Digital Input Faults A digital input fault usually is caused by high pressure low pressure or low temperature alarm conditions resulting from mechanical problems in the water source heat pump It also can be caused by a problem in the digital input circuit Below is a procedure to use to check for problems in the digital input circuit If the probable cause of the fault is found using this procedure attempt to clear the fault by cycling power to the WSHP If the probable cause of the fault is not found using this procedure assume that mechanical problems exist and have a qualified technician service the unit before attempting to reset the WSHP Controller 1 Check the voltage at the secondary of transformer it should be approximately 24 VAC 2 Determine the switch s digital input number Refer to the unit wiring diagram or to the input output tables Table 10 3 Check the wiring and connections throughout the digital input circuit 4 Measure the resistance through the switch contacts with at least one wire disconnected The switches normally are closed Service Information Brownout Fault The WSHP controller senses the AC voltage at the power input
19. ech Communications Gateway for Open Protocol MCGOP panel If you choose to upgrade your heat pumps the other application code can be installed in the field Component Data Microprocessor The MicroTech 2000 WSHP unit controller is a preprogrammed microprocessor containing the software required to monitor and control the unit The controller supports a minimum of six analog inputs four digital inputs and five digital outputs including the LED All electrical connections to the board are provided by three mass termination style headers Two of the headers are designated strictly for factory wiring the other for a field wiring harness that terminates to a screw type terminal strip on the unit s exterior The controller uses set points and fixed preprogrammed parameters to maintain unit control many of the set points and preprogrammed parameters can be adjusted with a PC over the network Yellow Status LED A yellow on board status LED aids in diagnostics by indicating the water source heat pump operating mode and alarm conditions The yellow LED indicates the unit operating mode as shown in Table 2 For more information on alarms refer to the Alarm monitoring and control section on page 10 A remote status LED is provided with all optional wall mounted temperature sensor packages It has the same function as the on board status LED If used the remote LED connects to the MicroTech WSHP controller at connection 1 on Te
20. extremely important to correctly locate each water source heat pump according to job requirements The proper location should have been determined during the installation process Nevertheless verify proper location during the commissioning process Field Wiring Check A unit wiring diagram is provided with each unit along with a model specific Installation and Maintenance Guide Before the commissioning process begins refer to this literature and using the following check lists thoroughly check the electrical installation Wall Sensor Packages 1 Check that the cable is twisted and shielded with drain wire Belden 8729 or equivalent N Check that four conductors are available e Check that the conductors are terminated at the unit and at the wall sensor package to screw terminal board 1 in accordance with the field wiring diagram on which terminals are clearly labeled Terminal 4 is used for both the room sensor common and the shield wire A Check the cable length between the wall sensor package and its water source heat pump controller See Table 4 on page 5 Network Communication Units 1 Check that the cable is a twisted unshielded pair of copper strand conductors 2 Check that the conductors are terminated properly 3 Check that the conductors are terminated at the MicroTech gateway panel according to the field wiring diagram supplied with the panel Set Points The Water Source Heat Pump set point
21. h immediately shuts down the compressor then unit operation is disabled by the WSHP controller software For information on troubleshooting digital input faults see Test Procedures on page 12 Effects as applicable The compressor immediately de energizes The software disables normal unit operation until the fault condition is manually corrected Low Temperature Fault The Low Temperature fault indicates that the low temperature switch input J4 12 sensed an open circuit while the controller was calling for the compressor to run The low temperature switch opens when the temperature falls below its set point model and size dependent For information on troubleshooting digital input faults see Test Procedures on page 12 Effects Unit changes to cooling for 60 seconds for coil defrost After 60 seconds in cooling the software immediately de energizes the compressor and fan The software disables normal unit operation until the fault condition is manually corrected 10 McQuay IM 660 3 Low Pressure Faults The Low Pressure fault indicates that the low pressure switch input J4 11 sensed an open circuit while the controller was calling for the compressor to run The low pressure switch opens when the temperature falls below its set point For information on troubleshooting digital input faults see Test Procedures on page 12 Effects The compressor immediately de energizes
22. hown in Table 10 on page 14 Test Procedures Microprocessor Problems The status LED indications can aid in WSHP controller diagnostics Approximately 40 seconds after power is applied to the WSHP the status LED should illuminate as shown in Table 2 on page 2 If not either there is a software problem or the WSHP controller is defective Power Supply Problems The WSHP controller requires a 24 VAC power supply It is connected to the board at the section labeled 24V GND and 24 VAC terminals J41 and J42 Refer to the unit wiring diagram If you suspect a problem with the WSHP controller power check the following 1 Verify that the main power switch is at ON 2 Check the voltage at the secondary of the transformer It should be approximately 24 VAC load dependent 12 McQuay IM 660 3 Erroneous Temperature Readings If you suspect that the WSHP controller is operating using erroneous temperature data check the sensors using the following procedure 1 Measure the temperature at the suspect sensor using an accurate thermometer 2 Determine the sensor s analog input number Refer to the unit wiring diagram or to the input output tables Table 10 3 Remove the connector from its WSHP controller terminals and measure the resistance of the sensor through the sensor connections 4 Using the thermistor chart Table 11 compare this value to the measured temperature 5 Ifthe measured resistance and temperatur
23. indicates that the fan has operated longer than the set number of hours Typically this warning is used to alert the building operator to replace the filter To clear the notification reset the filter timer at the network PC Effect Analarm message identifying the water source heat pump network address and time of occurrence is sent to the network printer McQuay IM 660 3 11 Service Information Inputs and Outputs Analog Inputs The MicroTech WSHP unit controller has six standard analog inputs See Table 7 The controller can sense temperatures in the range of 0 to 158 F 18 to 70 C Table 7 Analog inputs Description Location Discharge air temp sensor Inlet to fan Leaving water temp sensor Leaving water line Condensate overflow sensor Condensate drain pan Brownout supply voltage sensor On board Room air temp sensor Remote basic wall sensor Tenant override set point adjust Remote wall sensor Digital Inputs The water source heat pump controller has four standard digital inputs See Table 8 Digital input conditioning includes RC filtering with a time constant of at least 4 7 milliseconds The base module provides additional filtering using software filtering techniques The digital inputs sense the presence or absence of an external 24 VAC 20 power source with a minimum of 10 mA AC current flowing through the following isolated contacts Table 8 Digita
24. l inputs Description Location Refrigerant high pressure N C HP switch Refrigerant low pressure N C LP switch Refrigerant low temp N C LT switch Remote start stop N O Remote switch Refer to the wiring diagram supplied with your unit for specific wiring details Digital Outputs All digital outputs with the exception of the on board and off board status LEDs are capable of controlling electromechanical or solid state relays They switch inductive loads at 24 VAC 20 0 4 pF and at the steady state AC RMS currents listed in Table 9 10x single cycle surge currents are assumed on initial turn on The on board and off board status LEDs are controlled by one of the Neuron s I 0 pins capable of Pulse Width Modulation Table 9 Digital outputs Description Type AC RMS current rating E M pilot duty relay at 300 mA AC Fan poblacion SPST N O contacts E M pilot duty relay at 300 mA AC Compressor contactor SPST N O contacts Reversing valve E M pilot duty relay or SS random turn on Triac solenoid at 600 mA AC SPST N O contacts On board status LED Yellow Off board status LED DC sourced signal current limited to 10 mA DC Multi purpose spare E M pilot duty relay at 300 mA AC isolated E M contacts SPST N O contacts Input Output Tables All WSHP controller input and output connections and their corresponding water source heat pump components are s
25. nd the unit returns to unoccupied mode by default A separate configuration property is available that allows users to extend the tenant override period for up to 60 minutes with a second button press Except for the fact that it is temporary the tenant override operating mode is identical to the occupied operating mode LONWORKS only Pressing and holding the tenant override button for at least 6 seconds but not more than 10 seconds activates the network query address mode indicating the unit address in question at the MicroTech gateway panel LONWORKS only Pressing and holding the tenant override button more than 10 seconds activates the network self configure mode requesting the assignment of the next sequential address from the MicroTech gateway panel LONMARK only Similar to pressing the service pin pressing and holding the tenant override button for more than 10 seconds causes the Neuron chip to broadcast a message over the LONWORKS network containing its unique 48 bit Neuron ID This is useful during network commissioning McQuay IM 660 3 Commissioning The following commissioning procedures pertain to water source heat pumps equipped with the MicroTech Water Source Heat Pump Controller These procedures must be performed in addition to the mechanical and electrical system commissioning procedures outlined in the model specific installation literature listing provided in Table 1 on page 1 Z WARNING
26. nt Override cece eee eee 5 Test Procedures u nn ne GA le ge cos 12 iecinni Microprocessor Problems sess 12 Pu d SUE WAS XY CURT TERR ue CPP DUREE vh AD E Power Supply Problems 0 5 12 EUR ORE HEEL NAT O Y ES Erroneous Temperature Readings 13 Required tools and literature o 6 Digital Input Faults 13 Water Source Heat Pump Identification o a eee eee ee roe Wiss Een s T WSHP Controller Replacement isis 13 Network Communications Units 6 E a a ne ee O 6 Startup a nn es 6 Procedure for WSHP 0 00 e eee eee eee y McQuay is a registered trademark and MlcroTech 2000 is a trademark of McQuay International Copyright 2005 McQuay International All rights reserved throughout the world Introduction This manual provides information about the MicroTech 2000 Water Source Heat Pump WSHP controller and control system used in the McQuay International WSHP product lines The manual describes the controller s components input output configurations and service procedures For network installation or commissioning instructions for new projects refer to the protocol information document ED 14954 For general information on a particular WSHP unit refer to the model specific installation manual see Table 1 Table 1 Model specific water source heat pump installation literature
27. onnecting power to the unit Low Temperature Refrigerant Alarm Upon detection of a low temperature refrigerant alarm the unit controller immediately puts the reversing valve in the cooling position for 60 seconds After 60 seconds the compressor is disabled If the low temperature alarm disappears manually reset the unit controller by disconnecting and reconnecting power to the unit The low temperature alarm occurs only when the unit is in heating mode Low Pressure Refrigerant Alarm Upon detection of a low pressure refrigerant alarm the unit controller immediately disables the compressor If the low pressure alarm disappears manually reset the unit controller by disconnecting and reconnecting power to the unit Change Filter Notification network units only When the water source heat pump fan run time exceeds a network adjustable set point a change filter notification is indicated locally and over the MicroTech network McQuay IM 660 3 Configurable Relay Outputs The MicroTech 2000 WSHP controller provides one relay output that can be configured for the following four options Boilerless system skin heat relay Motorized water valve relay Fresh air damper relay Timed output relay LONWORKS only These options can affect installation requirements and unit control If more than one configurable relay output option is required the MicroTech 2000 WSHP auxiliary board is required to provide the other three
28. re any fault can be cleared the alarm conditions that caused it must have returned to normal When the alarm conditions are gone a fault may be cleared either automatically or manually as follows An auto reset fault immediately clears whenever the alarm conditions that caused it disappear To clear a manual reset fault cycle power to the controller Note Investigate and eliminate the cause of a manual reset fault before placing the unit back into service Alarm Fault Descriptions Table 6 below describes the alarm faults how they are triggered the factory settings that trigger them and how they are reset A detailed discussion of each follows Table 6 Alarm and fault code summary A Fault reset Fault Trigger Factory setting Clear Opens at 395 10 psig High pressure Hardware Closes at 250 25 psig Manual Opens at 7 3 psig Low pressure Hardware Closes at 22 7 psig Manual Condensate Hardware Conductivity trip point Manual overflow 2 5 micro ohms i Lo Brownout Software Hne voltage 82 of Auto nameplate voltage High Pressure Fault The High Pressure fault indicates that the high pressure switch input J4 9 sensed an open circuit while the controller was calling for the compressor to run The high pressure switch HP is wired in series with the compressor relay output J4 5 and the compressor relay coil Therefore if a high pressure condition occurs the switc
29. rminal Board 1 Table 2 Status LED indication Status LED status Mode On continually Occupied Occupied Load Shed On 0 5 sec Off 5 5 sec Unoccupied On 5 5 sec Off 0 5 sec Tenant Override Override Load Shed On 0 1 sec Off 0 1 sec Alarm Condition Condensate Overflow Brownout Compressor Fault Service Pin A service pin button is provided that can be used to cause the Neuron chip to broadcast a message over the LONWORKS network containing its unique 48 bit Neuron ID This ID is useful during network commissioning For another method of forcing the controller to broadcast its Neuron ID see Tenant override on page 5 Red Service LED A red on board service LED provides diagnostics by indicating the Neuron chip status The red LED indicates the Neuron chip status as shown in Table 3 below Table 3 Service LED indication Service LED status Mode Off continually Normal The Neuron has an application and is configured On continually The Neuron does not have an application or is damaged Downloading an application may correct this Blink slowly The Neuron has an application but is unconfigured Temperature Sensing The MicroTech 2000 WSHP unit controller uses negative temperature coefficient NTC thermistors for temperature sensing A thermistor chart which provides voltage to temperature and resistance to temperature conversion data is included
30. sis priest E ETU P C 24 VAC IMPORTANT To use onboard 24VAC Pilot duty relay change the jumper PF1 on the by others MicroTech 2000 controller ho from factory default pins 1 and 2 to f d pins 2 and 3 Figure 2 Second control signal output Terminal located on MicroTech 2000 auxilliary board J6 EEN D e feu pilot duty relay by others Use contacts as needed for option Figure 3 Third control signal output Terminal located on MicroTech 2000 auxilliary board J7 i by others CIFIC Tce anal VAC ee bed pilot duty relay by others Use contacts as needed for option Figure 4 Fourth control signal output Terminal located on MicroTech 2000 auxilliary board J10 by others E apem UJ Num APTE i 24 VAC rr pilot duty relay by others Do Use contacts as needed for option McQuay IM 660 3 Interface Features MicroTech Network Control sequencing stop start equipment protection monitoring and fault resets can be accomplished through a network connection The following unique values and parameters can be accessed for each unit refer to Protocol Document ED15054 for more information Return air and discharge air temperatures Compressor fan and reversing valve status High pressure low temperature brownout and drain pan status Occupied and unoccupied heat and cool set points
31. tatus LED and tenant override button Set point adjustment and thermometer are optional features The wall mounted sensor must be field installed and field wired to the water source heat pump Terminal Board 1 provides the connections for all room temperature sensor field wiring Refer to the unit wiring diagram provided and to IM 529 MicroTech Room Temperature Sensors for information on wall sensor package installation Figure 5 Wall mounted temp sensor wiring WSHP Wall sensor Sensor LED TB1 1 f i Red Tenant override TB1 2 a Green e Sensor input TB1 3 H F i White e Sensor common TB1 4 Black 0 Table 4 Maximum wire length to sensors Gauge Length ft 18 AWG 625 20 AWG 380 22 AWG 260 Remote Room Set Point Adjustment The remote set point adjustment potentiometer allows the room set point to be adjusted up or down by as much as 3 F 1 7 C It is available with several of the optional wall sensor packages Tenant Override A wall mounted tenant override switch is standard on all McQuay MicroTech Room Temperature Sensors Pressing and holding the tenant override button for 1 0 to 6 0 seconds puts the unit into tenant override mode for a set time period default 60 minutes Press the tenant override button again for 1 0 to 6 0 seconds a
32. ter source heat pumps The controller enables the mode of operation monitors the water and air temperatures and indicates fault conditions Each unit controller is factory programmed wired and tested for effective operation of your McQuay WHSP The MicroTech 2000 WSHP controller uses LONWoRKS technology One of the following two versions of the application software is loaded into the controller at the factory LONMARK 3 3 certified application code is the current standard application code for MicroTech 2000 units Use LONMARK application code in new applications including Units that operate stand alone Units that are integrated into a LONWORKS communication network for communicating with a building automation system BAS of your choice For network integration information refer to the Protocol Information document ED 15054 Unit controllers with LONMARK application code have a software identification of WHPE2E or higher LonTalk application code was designed prior to certification Use this application software only in existing systems where an existing MicroTech Communications Gateway MCG or MicroTech Communications Gateway for Open Protocol MCGOP panel is installed Use LonTalk application code in existing systems where MicroTech 2000 WSHPs connect to a McQuay MicroTech monitor through a MicroTech Communication Gateway MCG panel MicroTech 2000 WSHPs connect to a third party BAS system through a MicroT
33. the first circuit also fails McQuay IM 660 3 Diagnostic Service Unit Identification Wink Command The unit identification function allows verification of an individual unit network address without opening the unit access panels The compressor shuts off during this period and the minimum off timer must expire before the compressor is allowed to run again Upon receiving a wink command from a network management node the heat pump exhibits the following identification sequence status LED and fan sequences occur simultaneously e Status LED Flashes on 0 5 sec off 0 5 sec for 15 seconds Fan The heat pump fan turns off for 5 seconds turns on for 5 seconds then off again for 5 seconds Alarm Monitoring and Control The water source heat pump controller is programmed to monitor the water source heat pump for specific alarm conditions that may occur on the various model types If an alarm condition exists and is detected by the controller a fault occurs The water source heat pump controller indicates that a fault has occurred at the status LED on board or remote and executes appropriate control actions for the alarm conditions During a fault condition the status LED flashes constantly on 0 1 second off 0 1 second until the fault is cleared Refer to Test Procedures on page 12 of the Service Information section for information on troubleshooting digital input faults Clearing Faults Befo
34. troller adjusts the set points depends upon the network threshold level and the step value Optimal Start LONWoRks only Whether heating or cooling every start is an optimal start if the optimal start window is greater than zero The unit controller optimal start logic examines past data to calculate the optimal time to change the heat pump from unoccupied to occupied operation During optimal start load shed and tenant override are ignored If this option is selected two hours adjustable prior to scheduled time of occupancy the unit begins calculating the time required to bring the space temperature to occupied set point At the appropriate moment the unit energizes and begins heating or cooling as necessary The unit notes actual time to reach occupied set point and compares it to calculated time If the difference exceeds 15 minutes the unit adjusts its factors to adapt to actual room conditions Faults The WSHP controller examines fault conditions in the order of ascending priority Higher priority faults do not override lower priority faults A higher priority fault must be manually cleared before the WSHP controller can indicate a second lower priority fault If the unit has only one compressor faults on the second circuit are ignored For units with two compressors second circuit faults are lower priority than first circuit faults In a dual circuit unit a second circuit fault indication does not disable the unit unless
35. um temperature of USHS DIFF The fan also de energizes when the space temperature rises above the UHS set point however the controller code prevents the fan from stopping until 12 seconds after the compressor stops Note During normal non alarm operation the compressor is disabled if the stop to stop minimum off timer has not expired 5 minutes fixed Occupied Operating Mode The descriptions below assume that the factory default occupied fan setting is used and that the fan is always on If the occupied fan setting is adjusted to CYCLE the fan cycles with the compressor Cooling Operation The fan energizes and the reversing valve de energizes when the space temperature rises to the OCS set point see note below If the reversing valve was previously energized the compressor energizes after a 10 second delay If the reversing valve does not change state the compressor energizes immediately Once the compressor energizes the start to stop minimum timer overrides normal temperature control and keeps it energized for at least 2 minutes fixed The compressor de energizes when the space temperature falls below the OCS set point to a minimum temperature of OCS DIFF The fan also de energizes when the space temperature falls below the OCS set point however controller code prevents the fan from stopping until 12 seconds after the compressor stops Note During normal non alarm operation the compressor is
36. ure is provided to delay swishing It prevents the reversing valve from returning to its normal cooling position for a period of approximately 10 seconds after the compressor is re energized when the unit is in the heating mode If necessary an alarm condition can override the delay timer and de energize the reversing valve with the compressor Condensate Overflow Alarm If a condensate overflow alarm is detected the unit controller immediately disables the compressor Once the overflow alarm disappears the unit controller automatically resets the WSHP unit The condensate overflow sensor is an exposed ring terminal located in the condensate drain pan The condensate overflow alarm occurs only when the unit is in cooling mode Brownout Alarm The on board brownout feature is meant to protect the compressor contactors from low voltage or brownout conditions If the supply voltage to the water source heat pumps is below 82 of the nameplate value the WSHP controller detects it indicates it and de energizes the compressor After rectifying the brownout condition when supply voltage remains above 90 of nameplate normal unit operation resumes High Pressure Refrigerant Alarm If excessive pressure in the refrigeration circuit is detected by the high pressure switch the compressor and reversing valve de energizes immediately If the high pressure alarm disappears manually reset the unit controller by disconnecting and rec
37. values are held in memory and can be modified only over the MicroTech network Initially before any changes are made over the network the WSHP uses the default factory set points shown in Table 5 Start up Following are WSHP start up procedures for each communication type The start up procedure must be performed by a qualified technician for every WSHP on a job Connections for network wiring are made at terminals 5 and 6 of Terminal Board 1 The FTT 10 free topology transceiver on the MicroTech WSHP 2000 Controller is polarity insensitive thus polarity issues need not be addressed McQuay IM 660 3 Commissioning Procedure for WSHP after powerup If a wall sensor package is used the remote 1 Apply power to the unit Turn the main power switch to ON status LED should also illuminate 2 Check the status LED and operating mode changeover 3 Verify that the water source heat pump is operating devices The status LED should illuminate 30 to 40 seconds according to its sequence of operation as outlined in the Description of Operation section on page 8 Table 5 Network WSHP default set points and adjustability Description Factory programmed set point Adjustability range Occupied heating set point 70 F 21 C 35 F to 120 F 1 7 C to 49 C Occupied cooling set point 74 23 C 35 F to 120 F 1 7 C to 49 C Fan occupied On On cycle heat cycle cool on Unoccupie
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