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Summary of Contents for Doit 474053
- Page 1 INSTALLATION & Model No. 474053 OPERATION GUIDE Low Voltage Thermostat SYSTEM COOL HEAT AUTO Operator: Save this booklet for future use!
- Page 2 About Your New Thermostat . . . You have selected the 474053 low voltage heating/cooling thermo- stat. The sensitive spiral bimetal temperature sensor is combined with an adjustable heating anticipator and a fixed cooling anticipator to provide maximum comfort. Your new thermostat is easy to install and operate.
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Page 3: Table Of Contents
In This Guide . . . PRECAUTIONS ................. 4 SPECIFICATIONS ..............6 INSTALLING YOUR THERMOSTAT ........7 Check Thermostat Location Route Wires to Location Wire and Attach Thermostat OPERATING YOUR THERMOSTAT ........22 MAINTAINING YOUR THERMOSTAT ........24 Adjusting Heat Anticipator Calibrating Thermostat Operator: Save this booklet for future use! -
Page 4: Precautions
PRECAUTIONS NOTE If in doubt whether your wiring is millivolt, line, or low voltage, have the wiring inspected by a qualified heating and air contractor, electrician, or someone familiar with basic electricity and wiring. Do not exceed the specification ratings. All wiring must conform to local and national electrical codes and ordinances. - Page 5 CAUTION To prevent electrical shock and/or equipment damage, disconnect electrical power to the system, at main fuse or circuit breaker box, until installation is complete. Do not short out terminals on gas valve or primary control to test. Short or incorrect wiring will burn out heat antici- pator and could cause personal injury and/or property damage.
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Page 6: Specifications
SPECIFICATIONS ELECTRICAL DATA THERMAL DATA Switch Rating: Temperature Range: 24 VAC (30 VAC max.) Heat 50°F to 90°F (10°C to Heating 0.15 to 1.2 amps 32°C) Cooling 0 to 1.5 amps Switch Action: Differential: SPST sealed mercury 1°F (0.6°C) switch Anticipator Rating: Heating adjustable from 0.15 to 1.2 amps... -
Page 7: Installing Your Thermostat
INSTALLING YOUR THERMOSTAT CHECK THERMOSTAT LOCATION You should install your thermostat about five feet (1.5 meters) above the floor in an area with good air circulation and average tempera- ture. Normally, you can simply replace your old thermostat with your new one. -
Page 8: Route Wires To Location
• unheated areas behind the thermostat, such as an outside wall. ROUTE WIRES TO LOCATION If you are replacing an old thermostat and the wiring and location are satisfactory, use existing wiring. If in doubt, rewire. If you choose a new location or if this is a new installation, thermostat wire must first be run to the selected location. - Page 9 ⁄ ” hole for thermostat wire Stout cord with 6” chain attached Approximately 5 feet from floor Baseboard strip moulding ⁄ ” guide hole for sighting Quarter round removed ⁄ ” hole in floor of partition Hooked wire for snagging chain Figure 1.
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Page 10: Wire And Attach Thermostat
Through this hole, drop a light chain or 6” chain attached to a strong cord. Snag cord in basement with hooked wire. In houses without basements, drop cord through hole in ceiling and down partitioning; snag the cord at thermostat location. Attach thermostat wire to cord or chain and pull wire through hole in wall so that at least 6”... - Page 11 NOTE The typical wiring diagrams (figs. 2 through 5) show only the terminal identification and wiring hookup. Always refer to wiring instructions provided by equipment manufacturer for system hookup operation. All wiring must conform to national and local electrical codes and ordinances.
- Page 12 Push excess wiring back into wall and plug hole with fire- resistant material (such as fiberglass insulation) to prevent drafts from affecting thermostat operation. Position thermostat base over hole in wall and mark mounting hole locations on wall. Drill mounting holes. Fasten base loosely to wall using mounting screws.
- Page 13 Fixed cooling anticipator THERMOSTAT Adjustable heating anticipator Captive screws switch System switch AUTO SUBBASE System switch Moveable SYSTEM Factory-installed jumper yellow * Terminal A is not for field wiring. See jumper SPECIAL SYSTEM CONFIGURATIONS section for proper use of terminal A. Figure 2.
- Page 14 All wiring diagrams are for typical systems only. Always refer to equipment manufacturer’s instructions for system hookup opera- tions. CAUTION Do not allow wiring to pinch between the subbase and the wall. Be certain that the pivot post that protrudes from the rear of the thermostat does not rub the insulation of any wires.
- Page 15 KEEP THIS G RC AREA CLEAR OF WIRES! Factory-installed THERMOSTAT red jumper wire WIRING Moveable yellow jumper wire Factory-installed jumper Heat Compressor SYSTEM Relay Relay Relay 24 VAC 120 VAC Neutral Terminal energized Terminal energized in cooling in heating TRANSFORMER Figure 3.
- Page 16 Two-Transformer Systems CAUTION If two transformers are used, they MUST be in phase. Failure to do so will result in personal and/or property damage. Heat Pump Applications This subbase WILL NOT provide multi-stage heating or cooling. For single stage applications, install a short jumper wire across termi- nals W and Y.
- Page 17 KEEP THIS G RC AREA CLEAR OF WIRES! Moveable THERMOSTAT yellow jumper wire WIRING NOTE: Remove factory- installed jumper between RC and RH terminals for this application. TRANSFORMER TRANSFORMER Heat Compressor Relay Relay Relay SYSTEM 24 VAC 24 VAC 120 VAC 120 VAC Neutral Neutral...
- Page 18 NOTE RH and RC must be jumpered for single transformer heat pump systems. Special Function Terminals The B and O terminals can provide switching for special functions other than heat pump operation. When the system switch is in the HEAT position, the B terminal is energized. When the system switch is in the COOL position, the O terminal is energized.
- Page 19 KEEP THIS G RC AREA CLEAR OF WIRES! Factory-installed red jumper wire THERMOSTAT WIRING Moveable yellow jumper wire Field-installed jumper wire Factory-intalled jumper Field-installed jumper TRANSFORMER Compressor Relay Relay SYSTEM 24 VAC 120 VAC Neutral Reversing valve Reversing valve energized in cooling energized in heating Figure 5.
- Page 20 SYSTEM AUTO COOL HEAT Mounting Screw Mounting Screw KEEP THIS AREA Hole CLEAR OF WIRES in Wall Figure 6. Thermostat subbase...
- Page 21 Subbase Thermostat Cover Figure 7. Attach thermostat to subbase...
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Page 22: Operating Your Thermostat
OPERATING YOUR THERMOSTAT The thermostat is easy to operate. Fig. 8 shows how the heating/ cooling system and fan work when the switches are in various positions. Use the system switch to select either heating or cooling, or to turn the heating/cooling system off. Use the fan switch to control fan operation. - Page 23 Shows switch position SYSTEM OPERATION AUTO ON COOL OFF HEAT No heating; no cooling; no fan No heating; no cooling; fan runs continuously Cooling system cycles from thermostat; fan runs continuously Cooling system and fan cycle from thermostat Heating system cycles from thermostat; fan cycles from fan control on furnace Heating system cycles from thermostat;...
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Page 24: Maintaining Your Thermostat
MAINTAINING YOUR THERMOSTAT ADJUSTING HEAT ANTICIPATOR CAUTION The adjustable heat anticipator WILL BURN OUT if 25 VAC is applied directly to the thermostat by shorting out the primary control during testing. This may cause personal injury and/or property damage. This thermostat is equipped with and adjustable heat anticipator and was preset at the factory to provide satisfactory operation of the system under normal conditions. - Page 25 Remove thermostat cover. If heat cycle is too long, set heat anticipator to a slightly lower dial setting (about ⁄ division at a time). If heat cycle is too short, set heat anticipator to a slightly higher dial setting (about ⁄...
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Page 26: Calibrating Thermostat
CALIBRATING THERMOSTAT This thermostat has been carefully adjusted at the factory and should not require recalibration. A few degrees of difference be- tween the indicator setting of the thermostat and the actual room temperature is normal. If the disagreement is appreciable, however, first make sure that the thermostat is properly located and leveled, and that the cover thermostat matches the room temperature. - Page 27 Move temperature adjustment lever to a setting at least 5°F above room temperature. Remove thermostat cover. Slip ⁄ ” calibration wrench onto hex nut beneath bimetal. While holding temperature adjustment lever stationary, turn hex nut clockwise until mercury shifts to the right end of the tube (see fig.
- Page 28 thermostat during this period, as your breath and body heat will affect bimetal temperature. Move temperature adjustment lever to match actual room temperature. Remove thermostat cover. Slip ⁄ ” calibration wrench onto hex nut. While holding tem- perature adjustment lever stationary, turn hex nut counter- clockwise until mercury just barely shifts to the left end of the tube.
- Page 29 NOTES...
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- Page 32 Part No. 37-6452A 0248...
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