Robertshaw 400-402 Owner's Manual
Contents
1. CONTROLS COMPANY DESCRIPTION The TX400 is a low voltage wall mounted room temperature controller The heart of the TX400 thermostat is a SPDT sealed in glass switch hermetically sealed to protect from dust and moisture This switch does not require the critical level ing necessary with other types of thermostats A positive action of the switch is obtained by a magnet mounted on the temperature sensing coiled bimetal The basic TX400 can be used as a heating only cooling only or zone system thermostat depending on how the subbase is wired see schematic diagrams below The TX400 when employed with the DA490 Series covers all types of heating and cooling systems See the DA490 Series for switching arrangements and schematics A decorative wall plate is included with all models It can be used to cover old ther mostat mounting marks or to mount the thermostat on an electrical conduit box HOME OWNER NOTE Temperature Selection INSTALLATION DATA TX400 HEATING COOLING 24 VOLT THERMOSTAT CM260 SPECIFICATIONS To select a desired temperature after the thermostat has been installed turn the Ejgctrical 2 Low Voltage 30 VAC 1 5 Amps Max dial until the red index point indicates the desired temperature The actual room Switch SPDT temperature can be noted on the scale on the lower portion of the dial Design Heating 0 cece eee ee eee eeeeeeee Opens on Temperature Rise2. features have made it easy to find the setting you require for comfort and to read CODING ooann nanana aaaea Closes on Temperature Rise the instrument for reference Remember that the difference between comfort and Adjustable Heat Anticipation See Model Information Chart discomfort is usually no more than 1 or 2 degrees Make only small adjustments Fixed Cooling Anticipation See Model Information Chart to meet changing conditions Setting Range 00 e eee eee See Model Information Chart Thermometer Range 002 00 eee eee eee 44 96 F MODEL INFORMATION Differential c 4 u oi 6 Gain SA dd Grek bee oaks ibedenee Ena 20 F Dial USE COMPLETE MODEL NUMBER WHEN ORDERING Dimensions 000 3 1 4 Wide 3 5 8 High 1 1 2 Deep FIMS Ae eet e be ok tee iret eee oe ae Sune 2 ead eed one Beige DIAL TEMPERATURE ADJUSTABLE HEAT FIXED COOLING MODEL NUMBER SETTING RANGE ANTICIPATION ANTICIPATION APPLICATION TX400 400 48 85 F 18 to 1 0 Amps STD HEAT COOL ZONE TX400 401T 48 85 F 18 to 1 0 Amps SPECIAL GAS AIR CONDITIONING ONLY TX400 402 48 85 F 5 to 1 5 Amps STD HEAT COOL ZONE TX400 403 39 75 F 18 to 1 0 Amps STD HEAT COOL ZONE RX400 404 48 85 F 2 0 Amps Fixed STD ELECTRIC HEAT COOLING t For gas air conditioning systems SEE DA490 SERIES SUBBASES FOR SWITCHING SUBBASE REQUIREMENTS SCHEMATIC DIAGRAMS SHOWING BASIC TX400 THERMOSTAT WIRED FOR EITHER HE
3. ATING COOLING OR ZONE SYSTEM COOLING RELAY TRANSFORMER MOUNTING HOLES TX400 WIRED FOR COOLING GAS VALVE MOUNTING HOLES TX400 WIRED FOR HEATING TRANSFORMER ZONE VALVE MOUNTING HOLES TX400 WIRED FOR ZONE NOTE A SUITABLE LIMIT CONTROL IS REQUIRED IN EITHER THE 24 VOLT OR 120 VOLT SIDE OF TRANSFORMER FIGURE 1 FIGURE 2 FIGURE 3 THERMOSTAT COVER FACE SUBBASE THERMOSTAT BODY MOUNTING HOLES 11 Te AMINAL SCA EWS TIGHTEN THESE 4 r UARN ENR amp a Sttarguan INSTALLATION INSTRUCTIONS CAPTIVE SCREWS d CALIBRATION u et BiA L SHAFT a COOLING ANTICIPATO CAPTIVE SCREW i i HEAT L ANTICIFATOR this captive screw when mounting tharnmastat body on any switching iya TA e E ET aating edie r when Done Contr 3 wire mounting subbase i wed For fimating only 2 wire aplication this screw mol ued Tighten The model TX400 room thermostat consists of three separable units thermostat cover Figure 1 subbase Figure 2 and thermostat body Figure 3 1 Remove cover friction fit from thermostat body by gripping at top and bottom and lifting from subbase use extreme care not to dam age working parts 2 Remove subbase from the thermostat body by loosening captive screws see Figure 3 3 Pull approximately 3 inches of wire through the wall and thread the wire through the center of the subbase 4 Hold the subbase
4. level and against the wall so that the old holes are covered With a pencil mark the wall where the screws will attach the subbase to the wall Use designated mounting holes only Now lay the subbase to one side Drill the new mounting holes with a 3 32 drill bit 5 Connect wires to applicable terminal screws see schematic dia gram 6 Push excess wire back into wall and mount thermostat body on sub base with captive screws 7 Replace thermostat cover being careful to align D shaped dial shaft with matching shaped hole in hub of setting dial then press cover carefully on the thermostat body NOTE Some heating appliances are supplied with a time delay feature incorporated in the electrical circuit of the appliance controls WIRING If the appliance is so equipped there may be a delay of as much as three minutes depending on the device used after the thermostat calls for heating before the appliance is actually in operation LOCATION When selecting the thermostat s location consideration must be given to the following 1 Locate approximately five feet above the floor in a place accessible for wiring and setting preferably in a living room or an adjoining room 2 Locate on an inside wall a Do not locate where influenced by abnormal heat such as 1 In sunlight 2 Close to a radio TV or lamps 3 Over registers radiators or internal wall heat b Do not locate where influenced by abnormal cold such as 1 An o
5. ravel 5 Keeping hands and breath away from bimetal temperature sensing element Figure 3 turn calibration shaft in center of bimetal coil with oo PRINTED IN U S A 11 00 2000 Robertshaw Controls Co screwdriver counterclockwise until lever arm touches stop Figure 3 Continue to turn counterclockwise until magnet is away from glass switch when pressure on screwdriver is released 6 Slowly rotate calibration shaft clockwise until magnet touches glass switch 7 Thermostat is in calibration Replace thermostat cover NOTE If magnet is away from glass switch when thermostat cover is removed omit step 5 and proceed with steps 6 and 7 HEAT ANTICIPATION ADJUSTMENT Some heating installations require longer or shorter ON OFF periods to maintain even temperatures For average conditions set the heat antic ipator indicator upper left of thermostat body to match the current rat ing of the primary heating control Move indicator approximately 1 2 division in direction indicated by the arrows on the thermostat for longer ON cycles or move lever in opposite direction for shorter ON cycles Allow at least 24 hours to determine if setting provides satisfactory operation before making any further adjustments Form No 1 004J 30838J
6. utside wall or a wall separating an unheated room 2 In drafts from stairwells or doors 3 Close to windows c Do not locate where air circulation is poor such as 1 Behind open doors 2 In corners or alcoves 3 Over or close to furniture NOTE Location of thermostat in a high humidity moist atmosphere environment will shorten its operational life WARNING DO NOT SHORT GAS VALVE TERMINALS THIS WILL DAMAGE WALL THERMOSTAT WARNING All wiring must conform to local codes and ordinances For typi cal wiring of a forced air gas or oil fired installation see wiring dia gram CALIBRATION The thermostat is accurately calibrated before leaving the factory and no further calibration should be necessary If the thermostat appears to be out of calibration or for any reason fails to operate properly a quali fied serviceman should proceed as follows 1 Allow the thermostat to stay in the OFF position for at least 10 min utes until the internal temperature is stabilized During this time the thermostat must not be influenced by heat from the hands or any other heat source 2 Turn the temperature selector dial to the actual room temperature Carefully remove the thermostat cover noted under INSTALLATION 4 With small crescent wrench hold dial shaft Figure 3 being careful that shaft does not rotate from position it was in when cover was removed NOTE Hold wrench at angle so that steel tool does not interfere with magnet t
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