White Rodgers 1F78H User Manual
CONTENTS
Installation Instructions for
Heating & Air Conditioning
1F78H
5/2 Day Programmable Thermostat
Y OUR THERMOST A T 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
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
PREPARATIONS
1
Assemble tools required as shown below.
HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED
FLAT BLADE SCREWDRIVER
SPIRIT LEVEL OR PLUMB BOB AND LINE OPTIONAL—
THERMOSTAT DOES NOT NEED TO BE LEVEL TO WORK PROPERLY
WIRE CUTTER/STRIPPER
Failure to follow and read all instructions carefully
before installing or operating this control could cause
personal injury and/or property damage
THERMOSTAT DETAILS
2
Mounting
hole
W905
Clip for
Hydronic
System
W904
W905
W904
Clip for
Celsius Display
Figure 1. Thermostat base
W
RH
GC
GAS
ELEC
Electric/Gas
Switch
Mounting
hole
BRC
Y
O
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.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
www.white-rodgers.com
PART NO. 37-6448A
Printed in U.S.A.
0247
REMOVING OLD THERMOSTAT
3
CONTINUED FROM FIRST PAGE
ATTENTION! This product does not contain mercury. How-
ever, 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.
MOUNTING AND WIRING
4
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
Terminal Designation
RH
RC
G
W
Y
C
* Factory installed jumper wire between the RH
and RC terminals must remain in place.
Other Manufacturers’
Terminal Designation
4
RH
R
R
G
G
W
W
Y
Y
C
C
*
M
R
V
-
F
G
H
W
C
Y
X
C
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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MOUNTING AND WIRING
4
CONTINUED FROM SECOND PAGE
Y
Y
Cooling
System
NOTE
Y
Cooling
System
G W
Fan
Relay
G W
Fan
Relay
G W
Fan
Relay
OBC
NOTE
For Heat only,
attach to RH and W
Figure 2. Typical wiring diagram for
heat only, 4-wire, single transformer systems
Figure 3. Typical wiring diagram for
cool only, 4-wire, single transformer systems
RED jumper wire (provided with thermostat) must be
connected between thermostat RH and RC terminals
for proper thermostat operation with this system.
OBC
Figure 4. Typical wiring diagram for
heat/cool, 5-wire, single transformer systems
Heating
System
Heating
System
RCOBC
RC
JUMPER
WIRE
24 VAC
JUMPER
WIRE
RH
24 VAC
TRANSFORMER
THERMOSTAT
RH
TRANSFORMER
JUMPER
WIRE
RH
RC
24 VAC
TRANSFORMER
THERMOSTAT
SYSTEM
120 VAC
SYSTEM
Hot
120 VAC
Neutral
THERMOSTAT
SYSTEM
Hot
120 VAC
Neutral
Hot
Neutral
OBC
Y
Cooling
System
G W
Fan
Relay
Heating
System
THERMOSTAT
RH
RC
SYSTEM
24 VAC
HEATING
TRANSFORMER
24 VAC
COOLING TRANSFORMER
Hot
120 VAC
Neutral
Hot
120 VAC
Neutral
Figure 5. Typical wiring diagram for
heat/cool, 6-wire, two-transformer systems
G W
Fan
JUMPER
WIRE
RCOBC
24 VAC
THERMOSTAT
RH
SYSTEM
TRANSFORMER
Hot
120 VAC
Neutral
JUMPER
WIRE
Y
Reversing
Compressor
Valve*
Contactor
* Reversing valve is energized when the
system switch is in the COOL position
Relay
Figure 6. Typical wiring diagram for heat pump
with reversing valve energized in COOL
G W
Fan
JUMPER
WIRE
RCOBC
24 VAC
THERMOSTAT
RH
SYSTEM
TRANSFORMER
Hot
120 VAC
Neutral
JUMPER
WIRE
Y
Reversing
* Reversing valve is energized when the
system switch is in the HEAT position
Valve*
Compressor
Contactor
Relay
Figure 7. Typical wiring diagram for heat pump
with reversing valve energized in HEAT
CHECK THERMOST A T OPERA TION
5
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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