Emerson 750 Check Thermostat Operation, Fan Operation, Heating System, From Second

Page 3

4 MOUNTING AND WIRING

CONTINUED FROM SECOND PAGE

 

 

 

 

 

 

 

 

JUMPER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WIRE

 

 

 

 

 

 

 

 

 

 

B

O

Y

G

 

W

RC RH

THERMOSTAT

 

 

 

 

 

SYSTEM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fan

 

Heating

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Relay

 

System

 

 

 

 

 

 

 

 

 

 

Hot

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOTE

 

 

 

 

 

 

24 VAC

 

 

 

 

 

 

 

 

120 VAC

For 2-wire Heat only,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Neutral

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

attach to RH and W

 

 

 

 

 

 

TRANSFORMER

 

 

 

 

 

 

 

 

 

Figure 2. Typical wiring diagram for

heat only, 3-wire, single transformer systems

B O Y G W

 

 

 

 

 

 

Cooling

 

Fan

 

Heating

System

 

Relay

 

System

 

 

 

 

 

 

RC RH

THERMOSTAT

 

 

SYSTEM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Hot

 

 

 

 

 

 

 

 

 

24 VAC

 

 

 

 

 

 

 

120 VAC

 

 

 

 

 

 

 

 

 

Neutral

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HEATING

 

TRANSFORMER

24 VAC

 

 

 

 

 

 

 

Hot

 

 

 

 

 

 

 

 

 

 

 

 

 

 

120 VAC

 

 

 

 

 

 

 

 

 

Neutral

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

COOLING TRANSFORMER

 

 

 

 

JUMPER

 

 

 

 

 

WIRE

 

B

O

Y

G W

RC RH

THERMOSTAT

SYSTEM

 

 

 

 

 

 

 

Cooling

Fan

 

 

 

 

System

Relay

 

Hot

 

 

 

 

24 VAC

120 VAC

 

 

 

 

 

Neutral

 

 

 

 

TRANSFORMER

Figure 3. Typical wiring diagram for

cool only, 3-wire, single transformer systems

 

 

 

NOTE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RED jumper wire (provided with thermostat) must be

 

 

 

 

 

 

 

 

 

 

connected between thermostat RH and RC terminals

JUMPER

 

 

 

 

 

 

 

 

for proper thermostat operation with this system.

WIRE

 

 

 

 

 

 

 

 

B

O

 

Y

 

G

 

W

RC RH

THERMOSTAT

 

 

 

 

 

 

SYSTEM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cooling

 

Fan

 

Heating

 

 

 

 

 

 

 

 

 

 

 

 

 

System

 

Relay

 

System

 

 

 

 

 

 

 

 

 

Hot

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24 VAC

 

 

 

 

 

 

 

120 VAC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Neutral

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TRANSFORMER

Figure 4. Typical wiring diagram for

heat/cool, 4-wire, single transformer systems

Figure 5. Typical wiring diagram for

heat/cool, 5-wire, two-transformer systems

JUMPER JUMPER

WIREWIRE

B O

Y

G W

RC RH

THERMOSTAT

SYSTEM

 

 

 

 

Reversing

Compressor

Fan

 

 

Valve*

Contactor

Relay

 

Hot

 

 

 

24 VAC

120 VAC

* Reversing valve is energized when the

 

Neutral

system switch is in the COOL position

TRANSFORMER

 

 

 

Figure 6. Typical wiring diagram for heat pump

with reversing valve energized in COOL

JUMPER JUMPER

WIREWIRE

B

O

Y

G W

RC RH

THERMOSTAT

SYSTEM

 

 

 

 

 

Reversing

Compressor

Fan

 

 

Valve*

 

Contactor

Relay

 

Hot

 

 

 

 

24 VAC

120 VAC

* Reversing valve is energized when the

 

Neutral

system switch is in the HEAT position

TRANSFORMER

Figure 7. Typical wiring diagram for heat pump

with reversing valve energized in HEAT

5 CHECK THERMOSTAT OPERATION

NOTE

To prevent static discharge problems, touch side of ther- mostat to release static build-up before touching any keys.

If at any time during testing your system does not operate properly, contact a qualified serviceperson.

Fan Operation

If your system does not have a G terminal connection, skip to Heating System.

1.Turn on power to the system.

2.Move FAN switch to ON position. The blower should begin to operate.

3.Move FAN switch to AUTO position. The blower should stop immediately.

!CAUTION

To prevent compressor and/or property damage, if the outdoor temperature is below 50° F, DO NOT operate the cooling system.

This thermostat has a time delay between cooling cycles to allow the head pressure in the compressor to stabilize. If the tempera- ture is adjusted to call for cool within 5 minutes of the last cycle the snowflake icon will blink indicating the thermostat is locked out. After 3 to 5 minutes, the compressor will start and the snowflake icon will stop flashing. This helps prevent the compressor from cycling too quickly and is normal operation for the thermostat.

1.Move SYSTEM switch to COOL position.

2.Press to adjust thermostat setting below room tempera- ture. The blower should come on immediately on high speed, followed by cold air circulation

3.Press to adjust temperature setting above room tem- perature. The cooling system should stop operating.

Heating System

1.Move SYSTEM switch to HEAT position. If the heating system has a standing pilot, be sure to light it.

2.Press to adjust thermostat setting above room tempera- ture. The heating system should begin to operate.

3.Press to adjust temperature setting below room tem- perature. The heating system should stop operating.

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Image 3
Contents Thermostat Details ContentsYour Thermostat Replaces PreparationsMounting and Wiring From Second Check Thermostat OperationFan Operation Heating SystemFrom Third Thermostat Buttons and SwitchesOperating Features DisplayEnter Heating Program Programming Your ThermostatEntering Your Program Set Current Time and DayFrom Fifth SpecificationsTroubleshooting Check Your ProgrammingHeat, Cool or Fan Runs Constantly Narrow or wide temperature swingThermostat Setting and Thermostat No Cool

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