Installation Instructions for
Heating & Air Conditioning
1F78
Non-Programmable Thermostat
YOUR THERMOSTAT REPLACES
Typical System Compatibility Chart |
1F78 |
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Standard Heat Only Two Wire Gas or Oil Fired Systems (24 volt) |
Yes |
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Electronic Ignition Heat Only Two Wire Systems (24 volt) |
Yes |
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Electronic Ignition Heat Only Gas or Oil Fired Systems (24 volt) |
Yes |
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Standard Heat/Cool Systems (24 volt) |
Yes |
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Heat/Cool Systems Electric Heat (24 volt) |
Yes |
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Heat Only Electric Heat Systems (24 volt) |
Yes |
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Cool Only Systems (24 volt) |
Yes |
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Heat Pump Systems (No Aux or Emergency Heat) |
Yes |
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Hot Water Zone Heat Only (Two Wire) Systems |
Yes |
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Hot Water Zone Heat Only (Three Wire) Systems |
No |
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Line Voltage Heating or Baseboard 110/240 Volt Systems |
No |
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Millivolt Systems Floor or Wall Furnaces |
Yes |
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12 VDC Mobile Home Application |
Yes |
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Multistage Systems |
No |
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Systems Exceding 30VAC, 1.5 Amp |
No |
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CONTENTS |
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Preparations .................................................. |
1 |
Thermostat Details ........................................ |
1 |
Removing Old Thermostat ............................ |
1 |
Mounting and Wiring ..................................... |
2 |
Check Thermostat Operation ........................ |
3 |
Specifications ................................................ |
5 |
Troubleshooting ............................................ |
5 |
1 PREPARATIONS
Assemble tools required as shown below.
FLAT BLADE SCREWDRIVER
HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED
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
2 THERMOSTAT DETAILS
Mounting
hole
- |
+ |
- |
+ |
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W RH |
B |
RC |
Mounting |
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G |
O |
Y |
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hole |
W904 |
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W905 |
W905 |
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Clip for |
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Hydronic |
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System |
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ELEC GAS |
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W904 |
Electric/Gas |
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Clip for |
Switch |
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Celsius Display |
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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 using the labels enclosed with the new 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 is a division |
PART NO. 37-6615A |
of Emerson Electric Co. |
|
www.white-rodgers.com |
0435 |
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 2895 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.
The factory default setting is forced air heat. Clipping jumper W905 on the circuit board will produce a longer heating cycle which is normally for hot water or steam (hydronic) systems. Both settings produce a very accurate temperature control and can be set to your personal preference. As received, the thermostat cycles the system just under 1˚F. With W905 clipped, the system cycles at approximately 1.5˚F.
! 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 |
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Other Manufacturers’ |
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Terminal Designation |
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Terminal Designation |
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RH |
4 |
RH |
M |
* |
* |
R5 |
R |
||||
RC |
R |
R |
V |
- |
- |
G |
G |
G |
F |
G |
G |
W |
W |
W |
H |
4 |
W |
Y |
Y |
Y |
C |
Y6 |
Y |
*These are four-wire, single-transformer systems. 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. 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.
Battery Location
This thermostat requires 2 “AAA” alkaline batteries to operate. If “LO BATTERY” is displayed, the batteries are low and should be replaced with fresh “AAA” Energizer® alkaline batteries. To replace the batteries, install the batteries along the top of the base (see fig. 1). The batteries must be installed with the positive(+) ends to the right.
www.white-rodgers.com
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