White Rodgers 1F78H User Manual

5 (1)

Installation Instructions for

Heating & Air Conditioning

1F78H

5/2 Day Programmable Thermostat

CONTENTS

 

Preparations ..................................................

1

Thermostat Details ........................................

1

Removing Old Thermostat ............................

1

Mounting and Wiring .....................................

2

Check Thermostat Operation ........................

3

Configuration Menu .......................................

4

Programming your Thermostat .....................

5

Specifications ................................................

7

Troubleshooting ............................................

8

YOUR THERMOSTAT REPLACES

Typical System Compatibility Chart

1F78H

 

 

 

 

Standard Heat Only Gas or Oil Fired Systems (24 volt)*

Yes

 

Electronic Ignition Heat Only Two Wire Systems (24 volt)*

Yes

 

 

 

 

Electronic Ignition Heat Only Gas or Oil Fired Systems (24 volt)*

Yes

 

Standard Heat/Cool Systems (24 volt)*

Yes

 

 

 

 

Heat/Cool Systems Electric Heat (24 volt)*

Yes

 

Heat Only Electric Heat Systems (24 volt)*

Yes

 

Cool Only Systems (24 volt)*

Yes

 

 

 

 

Heat Pump Systems (No Aux or Emergency Heat)*

Yes

 

 

 

 

Hot Water Zone Heat Only Systems

No

 

Hot Water Zone Heat Only (Three Wire) Systems

No

 

Line Voltage Heating or Baseboard 110/240 Volt Systems

No

 

Millivolt Systems Floor or Wall Furnaces

No

 

12 VDC Mobile Home Application

No

 

 

 

 

Multistage Systems

No

 

 

 

 

Systems Exceeding 30VAC, 1.5 Amp

No

 

 

 

 

* Requires common wire for 24VAC at the thermostat

 

 

 

 

 

1 PREPARATIONS

Assemble tools required as shown below.

FLAT BLADE SCREWDRIVER

WIRE CUTTER/STRIPPER

HAND OR POWER

DRILL WITH 3/16 INCH

DRILL BIT, IF NEEDED

SPIRIT LEVEL OR PLUMB BOB AND LINE OPTIONAL—

THERMOSTAT DOES NOT NEED TO BE LEVEL TO WORK PROPERLY

Failure to follow and read all instructions carefully before installing or operating this control could cause personal injury and/or property damage

2 THERMOSTAT DETAILS

Mounting

hole

 

 

W

RH

B

RC

Mounting

 

C

G

O

Y

 

 

 

 

 

hole

W904

 

 

 

 

W905

W905

 

 

 

 

 

 

 

 

 

Clip for

 

 

 

 

 

Hydronic

 

 

 

 

 

System

 

ELEC GAS

 

 

 

W904

Electric/Gas

 

 

 

Clip for

Switch

 

 

 

Celsius Display

 

 

 

 

Figure 1. Thermostat base

3 REMOVING OLD THERMOSTAT

! CAUTION

To prevent electrical shock and/or equipment damage, disconnect electrical power to the system at the main fuse or circuit breaker until installation is complete.

Before removing wires from old thermostat’s switching subbase, label each wire with the terminal designation it was removed from.

1.Remove Old Thermostat: A standard heat/cool thermostat consists of three basic parts:

a.The cover, which may be either a snap-on or hinge type.

b.The base, which is removed by loosening all captive screws.

c.The switching subbase, which is removed by unscrewing the mounting screws that hold it on the wall or adaptor plate.

2.Shut off electricity at the main fuse box until installation is complete. Ensure that electrical power is disconnected.

3.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.

4.Identify each wire attached to the old thermostat.

5.Disconnect the wires from the old thermostat one at a time.

DO NOT LET WIRES FALL BACK INTO THE WALL.

6.Install new thermostat using the following procedures.

WHITE-RODGERS

 

EMERSON ELECTRIC CO.

PART NO. 37-6448A

9797 REAVIS ROAD

Printed in U.S.A.

ST. LOUIS, MISSOURI 63123-5398

0247

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3 REMOVING OLD THERMOSTAT

CONTINUED FROM FIRST PAGE

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 non-absorbent 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 2892 Harrison Street, Batesville, AR 72501-2117 for proper disposal.

4 MOUNTING AND WIRING

!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 circuits per the NEC code.

Electric Heat or Single-Stage

Heat Pump Systems

This thermostat is configured from the factory to operate a heat/ cool, fossil fuel (gas, oil, etc.), forced air system. It is configured correctly for any system that DOES NOT require the thermostat to energize the fan on a call for heat. If your system is an electric or heat-pump system that REQUIRES the thermostat to turn on the fan on a call for heat, locate the GAS/ELECTRIC switch (see fig. 1) and switch it to the ELECTRIC position. This will allow the thermostat to energize the fan immediately on a call for heat. If you are unsure if the heating/cooling system requires the thermostat to control the fan, contact a qualified heating and air conditioning service person.

Hydronic (Hot Water or Steam)

Heating Systems

This thermostat is set to operate properly with a forced-air heating system. If you have a hydronic heating system (a system that heats with hot water or steam), you must set the thermostat to operate properly with your system by changing the first option in the configuration menu to SL (see Configuration Menu, page 5).

! CAUTION

Take care when securing and routing wires so they do not short to adjacent terminals or rear of thermostat. Personal injury and/or property damage may occur.

TERMINAL CROSS REFERENCE CHART

New Thermostat

Other Manufacturers’

Terminal Designation

Terminal Designation

RH

4

RH

M

*

R

RC

R

R

V

-

G

G

G

F

G

W

W

W

H

W

Y

Y

Y

C

Y

C

C

C

X

C

*Factory installed jumper wire between the RH and RC terminals must remain in place.

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. If necessary, move the electric heat switch (see ELECTRIC HEAT SYSTEMS, above).

2.Connect wires beneath terminal screws on base using appropriate wiring schematic (see figs. 2 through 7).

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.

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White Rodgers 1F78H User Manual

4 MOUNTING AND WIRING

CONTINUED FROM SECOND PAGE

 

 

 

 

 

 

JUMPER

 

 

 

 

 

 

 

WIRE

 

C

B

O

Y

G

W

RC RH

THERMOSTAT

SYSTEM

 

 

 

 

 

 

 

 

 

NOTE

 

Fan

Heating

 

 

 

For Heat only,

 

Relay

System

 

Hot

 

attach to RH and W

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24 VAC

120 VAC

 

 

 

 

 

 

 

Neutral

 

 

 

 

 

 

TRANSFORMER

Figure 2. Typical wiring diagram for heat only, 4-wire, single transformer systems

 

 

 

 

 

JUMPER

 

 

 

 

 

 

WIRE

 

C

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, 4-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

C

B

O

 

Y

 

G

 

W

RC RH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cooling

 

Fan

 

Heating

 

 

 

 

 

 

 

System

 

Relay

 

System

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24 VAC

 

 

 

 

 

 

 

 

 

 

 

 

 

THERMOSTAT

SYSTEM

Hot

120 VAC

Neutral

TRANSFORMER

Figure 4. Typical wiring diagram for heat/cool, 5-wire, single transformer systems

THERMOSTAT

C

B

O

Y

G

W

RC

RH

SYSTEM

 

 

 

 

 

 

 

 

 

 

 

Cooling

Fan

Heating

 

 

Hot

 

 

 

 

24 VAC

120 VAC

 

 

 

System

Relay

System

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Neutral

 

 

 

 

 

 

 

 

HEATING

 

 

 

 

 

 

 

TRANSFORMER

 

 

 

 

 

 

 

 

Hot

 

 

 

 

 

 

 

24 VAC

120 VAC

 

 

 

 

 

 

 

 

Neutral

 

 

 

 

 

 

 

COOLING TRANSFORMER

Figure 5. Typical wiring diagram for heat/cool, 6-wire, two-transformer systems

JUMPER

JUMPER

WIRE

WIRE

C 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

WIRE

WIRE

C

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 thermostat 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.

Cooling System

! 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 temperature 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 temperature. The blower should come on immediately on high speed, followed by cold air circulation

3.Press to adjust temperature setting above room temperature. 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 temperature. The heating system should begin to operate.

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

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