1F82-261
Programmable Electronic Digital
Heat Pump Thermostat
INSTALLATION AND
OPERATION INSTRUCTIONS
Operator: Save these instructions for future use!
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL INJURY AND/OR PROPERTY DAMAGE.
Your new White-Rodgers 5-Day/1-Day/1-Day Digital Thermostat uses the technology of a solid-state microcomputer to provide precise time/temperature control. This thermostat offers you the flexibility to design heating and cooling programs that fit your needs.
Features:
•Separate 5-day (weekday) and 1-day/1-day (Saturday/Sunday) programmingwithfourseparatetime/temperatureperiodsperday
•Simultaneous heat and cool program storage
•Preprogrammed temperature control
•Optional battery back-up for AC power loss
DESCRIPTION
•LCD continuously displays set point, and alternately displays time and room temperature
•Continuous Backlit display option
•Temperature override until next program period
•Manual program override (HOLD temperature)
•Temporary HOLD
•°F/°C convertibility
•Temperature range 45° to 90°F
•R, C, Y, W2, G, O/B, E, and L terminals for single or twotransformer systems
This thermostat is intended for use with a low voltage NEC Class II system. Do not use this thermostat with a line voltage system. If in doubt about whether your wiring is millivolt, line, or low voltage, have it inspected by a qualified heating and air conditioning contractor or electrician.
Do not exceed the specification ratings.
All wiring must conform to local and national electrical codes and ordinances.
This control is a precision instrument, and should be handled carefully. Rough handling or distorting components could cause the control to malfunction.
▲! CAUTION
To prevent electrical shock and/or equipment damage, disconnect electric power to system at main fuse or circuit breaker box until installation is complete.
PRECAUTIONS
▲! WARNING
Do not use on circuits exceeding specified voltage. Higher voltage will damage control and could cause shock or fire hazard.
Do not short out terminals on gas valve or primary control to test. Short or incorrect wiring will damage thermostat and could cause personal injury and/or property damage.
Thermostat installation and all components of the system shall conform to Class II (current limited) circuits per the NEC code. Failure to do so could cause a fire hazard.
SPECIFICATIONS
ELECTRICAL DATA
Electrical Rating:
20 to 30 VAC 50/60 Hz. or D.C.
0.05 to 1.0 Amps (Load per terminal)
1.5 Amps Maximum Total Load (All terminals combined)
THERMAL DATA
Setpoint Temperature Range:
45°F to 90°F (7°C to 32°C)
Operating Ambient Temperature Range:
32°F to 105°F
Operating Humidity Range:
0 to 90% RH (non-condensing)
Shipping Temperature Range:
APPLICATIONS
For use with the following Class II systems:
•Standard heat pump systems with electric, gas or oil Aux heat with 24VAC Hot and Common available
•Single-stage heat pump systems with no Aux heat with 24VAC Hot and Common available
DO NOT USE WITH:
•Millivolt systems
•Systems exceeding 30 VAC and 1.5 amps
•3-wire zoned hydronic heating systems
-4°F to 149°F
WHITE-RODGERS
EMERSON ELECTRIC CO. |
Printed in U.S.A. |
PART NO. 37-6175D |
9797 REAVIS ROAD |
Replaces 37-6175C |
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ST. LOUIS, MISSOURI 63123-5398 |
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0225 |
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www.white-rodgers.com |
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INSTALLATION
REMOVE OLD THERMOSTAT
1.Shut off electricity at the main fuse box until installation is complete. Ensure that electrical power is disconnected.
2.Remove the front cover of the old thermostat. With wires still attached, remove wall plate from the wall. If the old thermostat has a wall mounting plate, remove the thermostat and the wall mounting plate as an assembly.
3.Identify each wire attached to the old thermostat using the labels enclosed with the new thermostat.
4.Disconnect the wires from old thermostat one at a time. DO
NOT LET WIRES FALL BACK INTO THE WALL.
5.Install new thermostat using the following procedures.
ATTENTION!
This product does not contain mercury. However, this product may replace a unit which contains mercury.
Do not open mercury cells. If a cell becomes damaged, do not touch any spilled mercury. Wearing nonabsorbent gloves, take up the spilled mercury and place into a container which can be sealed. If a cell becomes damaged, the unit should be discarded.
Mercury must not be discarded in household trash. When the unit this product is replacing is to be discarded, place in a suitable container and return to White-Rodgers at 9797 Reavis Road, St. Louis, MO, 63123-5398 for proper disposal.
ATTACH THERMOSTAT BASE TO WALL
1.Remove the packing material from the thermostat. Gently pull the cover straight off the base. Forcing or prying on the thermostat will cause damage to the unit.
2.Connect wires beneath terminal screws on base using appropriate wiring schematic (see figs. 2 through 4).
3.Place base over hole in wall and mark mounting hole locations on wall using base as a template.
4.Move base out of the way. Drill mounting holes.
5.Fasten base loosely to wall, as shown in fig. 1, using two mounting screws. Place a level against bottom of base, adjust until level, and then tighten screws. (Leveling is for appearance only and will not affect thermostat operation.) If you are using existing mounting holes, or if holes drilled are too large and do not allow you to tighten base snugly, use plastic screw anchors to secure subbase.
6.Push excess wire into wall and plug hole with a fire-resistant material (such as fiberglass insulation) to prevent drafts from affecting thermostat operation.
ELECTRIC/GAS JUMPER (Fan Option)
Read the following information before clipping the nonelectric heat jumper. If you are unsure of your application, contact a qualified service person.
If your emergency or auxiliary system will energize the blower, then jumper, W904, on the thermostat base must be cut (see fig. 1).
If your emergency or auxiliary heat system requires that the thermostat energize the fan circuit, do not cut jumper W904.
OPTIONAL BATTERIES
With two "AA" batteries installed, your thermostat will maintain time and continuously display the temperature during a loss
Optional (2) "AA" batteries
Screw anchors
O/B switch
W904
Mounting hole
Reset switch
(below Fan switch) W904
Mounting Electric/Gas hole
jumper
Figure 1. Thermostat Base
of AC power. Installed batteries will also allow programming prior to installation.
ENERGY MANAGEMENT RECOVERY (EMR)
When the EMR feature is activated the thermostat's microcomputer calculates the time it will take to change the room temperature to the next heat or cool program setting. Then the thermostat will start the system before the next programmed period so that the desired temperature is reached at or near the beginning of the period (the thermostat calculates 15 minutes for every 1°F temperature change). This minimizes the use of auxiliary stages during the transition period to reduce energy costs.
For example: The thermostat is programmed to provide an overnight heating temperature of 66°F, and during the next program period, beginning at 6:00 AM, the programmed temperature is 70°F. With EMR activated, the thermostat will automatically start the heating system at 5:00 AM, so that the programmed temperature of 70°F is reached by about 6:00 AM.
If the overnight room temperature drops only to 68F°, the thermostat will start the system at 5:30 to reach the programmed temperature of 70°F at 6:00.
The thermostat is shipped with the EMR feature active, which means that the thermostat will start the heating system before the beginning of the next program period. This feature provides better efficiency by allowing gradual temperature changes using only the first stage of heat.
To deactivate the EMR function, see the Configuration menu on Page 5). The thermostat will then wait until the programmed time to start the system for a temperature change.
O/B TERMINAL SWITCH SELECTION
The O/B switch on this thermostat is factory set to the “O” position. This will accommodate the majority of heat pump applications, which require the changeover relay to be energized in COOL. If the thermostat you are replacing or the heat pump being installed with this thermostat requires a “B” terminal, to energize the changeover relay in HEAT, the O/B switch must be moved to the “B” position.
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THERMOSTAT
O/B |
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W2 |
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L |
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See Note ** |
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SYSTEM |
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SYSTEM |
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Changeover |
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Fan |
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Emergency |
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MONITOR |
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Relay* |
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Compressor |
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Aux |
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SWITCH |
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Relay |
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Relay |
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Relay |
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Contactor |
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(Stage 2) |
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24 VAC |
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Hot |
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120 VAC |
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* Changeover Relay is energized in COOL when O/B switch is in the “O” position |
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Neutral |
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Changeover Relay is energized in HEAT when O/B switch is in the “B” position |
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TRANSFORMER |
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** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency |
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(Class II Current Limited) |
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Figure 2. Typical wiring diagram for single transformer systems
NOTE
If safety circuits are in only one of the systems, remove the transformer of the system with NO safety circuits.
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O/B |
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W2 |
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THERMOSTAT |
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CUT AND |
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TAPE OFF! |
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See Note ** |
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Changeover |
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Fan |
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MONITOR |
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Relay* |
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Relay |
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Emergency |
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SWITCH |
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Safety |
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Relay |
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Switches |
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Aux |
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Relay |
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Contactor |
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Hot |
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NEUTRAL |
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24 VAC |
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120 VAC |
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TWO COMMONS MUST |
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Neutral |
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* Changeover Relay is energized in COOL when O/B switch is in the “O” position |
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TRANSFORMER |
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BE JUMPERED TOGETHER! |
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(Class II Current Limited) |
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Changeover Relay is energized in HEAT when O/B switch is in the “B” position |
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** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency
Figure 3. Typical wiring diagram for two transformer systems with NO safety circuits
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NOTE |
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Polarity must be |
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If the HOT side of |
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the second transformer is jumpered to the |
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COMMON side of the first transformer a short |
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will be made. Damage to equipment will occur |
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when power is restored. |
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THERMOSTAT |
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O/B |
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W2 |
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L |
R |
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SYSTEM |
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Limit or |
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See Note ** |
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Limit or |
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Safety |
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Safety |
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120 VAC |
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SYSTEM |
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Changeover |
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Fan |
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Emergency |
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NEUTRAL |
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MONITOR |
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Relay* |
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Relay |
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Relay |
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SWITCH |
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24 VAC |
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Auxiliary |
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ACCESSORY |
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Compressor |
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Aux |
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RELAY N.O. |
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Relay |
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Contactor |
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CONTACT |
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(Class II |
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(Stage 2) |
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Current Limited) |
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TWO COMMONS MUST |
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Limit or |
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BE JUMPERED TOGETHER! |
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Safety |
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Safety |
HOT |
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* Changeover Relay is energized in COOL when O/B switch is in the “O” position |
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Switches |
24 VAC |
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120 VAC |
Switches |
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Changeover Relay is energized in HEAT when O/B switch is in the “B” position |
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COMMON |
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** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency |
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NEUTRAL |
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Heat Pump Transformer |
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(Class II Current Limited) |
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Figure 4. Typical wiring diagram for two transformer systems with safety circuits in BOTH systems
3
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