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Christie Digital Systems 38-DSP104

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1. stat with magnetic contactor Place thermostat on inside wall away from undue heating or cooling influences about 4 feet above the floor WR 90 is especially useful in holding lower tem peratures for example in garages warehouses factories etc 2010 Chromalox Inc NOTICE Type WR thermostats are designed for temperature control service only Because they do not fail safe they should not be used for temperature limiting duty CAUTION Users should install adequate back up controls and safety devices with their electric heating equipment Where the consequences of failure may be severe back up controls are essential Although the safety of the installation is the responsi bility of the user Chromalox will be glad to make equipment rec ommendations Principle of Operation Control action of these thermostats is provided through the principle of liquid volume change With a variation in temperature the liquid in the sensing element expands or contracts causing a bellows to actuate the switching mechanism CAUTION Not for use in hazardous environments as described in National Electrical Code Failure to comply can result in explosion or fire MOUNTING Note Do not mount control where it will be subject to vibration shock grease dust lint or corrosive vapors Do not mount adja cent to a large magnetic contactor as vibration and shock will cause thermostat to interact erratically resulting in chattering of th
2. Chromalox Installation Instructions SERVICE REFERENCE fowision 4 senon WR SALES REFERENCE Supersedes PK410 PK410 1 161 048634 001 pate JUNE 1989 Type WR Room Thermostat pme Note WR 80 is nota Fail Safe Device y 21 A WR 80 40 to 80 F UL Listed Specifications Table A 2S ee 26 eg 91 gt A WR 90 20 to 90 F UL Listed Maximum Rating Range F 120Vac 115Vac 125va pilot duty use with d c contactor 25 amps or 3000 total watts WR 80 40 80 WR 90 20 90 t d c ratings not UL listed total watts 240Vac t 230Vac 125va pilot duty use with d c contactor 277Vac 480Vac 125va pilot duty use with a c contactor 22 amps or 5280 18 amps or 5000 total watts GENERAL Positive accuracy long and reliable service 3 differential Heavy duty single stage SPST line voltage snap acting switch Patented hydraulic element WR 80 has internal sensing element and thermometer on cover WR 90 has external coiled sensing element but no thermometer Both have a low position which drops control point to keep heater off WR 80 and WR 90 fin ished in tough metallic gray with chrome trim mounting plate fits outlet or conduit box Uses Automatically controls room temperature by turning elec tric air heaters on and off Can be used to control the air heaters directly within thermostat rating For higher ratings use thermo
3. e contactor CAUTION Do not twist or uncoil the coiled element on top of the case of the WR 90 The proper location of a heavy duty room thermostat is important to assure good performance Locate where air circulates freely Never install on or near outside wall Keep away from windows or doors Do not locate too close to strong light or other false source of heat such as sunlight steam lines etc If electrical conduit leads into cooler or warmer room plug up space around wires in the conduit with rock wool Penne A WIRING CAUTION Hazard of Electric Shock Disconnect all power before wiring or servicing this control 1 Electric wiring to heater must be installed in accordance with National Electrical Code and with local codes WARNING Use copper conductors only Thermostat Figure 1 Single phase loads when load does not exceed rating of thermostat Connect wires according to wiring diagrams Figures 1 and 2 Note Electrical connections should be made with generous loops of wire approximately 6 per lead Note If load amperage or voltage rating exceeds switch rating a contactor must be used Contactor and wiring to be supplied by customer See Figure 2 Contactor Thermostat Control Circuit Figure 2 Single phase loads when load exceeds rating of thermostat and three phase loads CALIBRATION CAUTION Hazard of Electric Shock Extreme care should be exercised during calib
4. le to this product at http Awww chromalox com customer service policies termsofsale aspx Chromalox PRECISION HEAT AND CONTROL 1347 HEIL QUAKER BLVD LAVERGNE TN 37086 Phone 615 793 3900 www chromalox com
5. ration adjustments because of shock hazard due to exposed electrical terminals WR 80 thermostats are accurately calibrated at the factory so the dial setting correctly indicates the temperature at which the contacts open on temperature rise If as a result of damage in tran sit or for other reasons the room temperature differs appreciably from the dial setting the calibration may be adjusted as follows 1 Note temperature on thermometer 2 Set dial at highest temperature 3 Turn dial slowly to lower temperature and stop when thermo stat contacts open 4 Loosen screw at bottom of thermostat and remove thermostat from mounting plate 5 On back of thermostat loosen two dial screws Figure 3 Carefully turn the dial only to correct temperature setting as indicated by thermometer Be sure the thermostat shaft is not moved during this operation 6 Tighten the dial screws and replace thermostat i Dial Screws Figure 3 CALIBRATION SETTING WR 90 controls have an adjustable differential The movable indicator points to the temperature at which the contacts open The fixed indicator points to the temperature at which the contacts close The difference between these two indicators is the differential To set the control proceed as follows 1 Use screwdriver in slot and turn the dial so the fixed indicator B points to the temperature at which heating is to start 2 Turn the differential adjusting screw C un
6. til the movable indicator D points to the temperature at which the heating is to stop B Fixed Indicator Cut In Point C Differential Adjusting Screw D Moveable Indicator Cut Out Point Dial Screws Figure 4 UNITING LIQUID IN THERMOMETER Sometimes the red liquid inside the thermometer on the WR 80 becomes separated during shipment The thermometer will not read correctly when this red liquid is separated at any point If the red liquid in the thermometer of this thermostat has become sepa rated it may be reunited as follows 1 Remove the thermostat from the wall and straighten out the four prongs so the cover can be removed to expose the ball of the thermometer 2 Hold the lighted end of a cigarette or a match at such a distance from the SIDE of the ball of the thermometer so the red liquid rises SLOWLY in the stem of the thermometer 3 When the lowest separation goes into the reservoir immedi ately remove the heat and blow on the thermometer Figure 5 Reservoir Stem Lowest Separation Don t Touch Thermometer With Match or Cigarette N Match or y Cigarette To Remove Outside C ia o Remove Outside Cover i Straighten These 4 Prongs Don toy Heat From CAUTION f there is more red liquid in the stem of the ther mometer above the lowest separation than there is below it it is best to replace the thermometer Limited Warranty Please refer to the Chromalox limited warranty applicab

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