White-Rodgers 1E78 Non Programmable Heat Only Thermostat User Manual

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2

3

4

CONTENTS  

Preparations ................................................ 1  

Thermostat Details ...................................... 1  

Removing Old Thermostat........................... 1  

Mounting and Wiring.................................... 2  

Check Thermostat Operation....................... 3  

Specifications .............................................. 4  

Troubleshooting ........................................... 4  

Installation Instructions for  

Heating & Air Conditioning  

1E78  

Non-Programmable Heat Only Thermostat  

YOUR THERMOSTAT REPLACES  

Typical System Compatibility Chart  

PREPARATIONS  

1

Assemble tools required as shown below.  

1E78  

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

Electronic Ignition Heat Only Two Wire Systems (24 volt)  

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

Standard Heat/Cool Systems (24 volt)  

Yes  

Yes  

Yes  

No  

No  

No  

No  

No  

Yes  

No  

No  

Yes  

Yes  

No  

No  

FLAT BLADE SCREWDRIVER  

Heat/Cool Systems Electric Heat (24 volt)  

Heat Only Electric Heat Systems (24 volt)  

Cool Only Systems  

HAND OR POWER  

DRILL WITH 3/16 INCH  

DRILL BIT, IF NEEDED  

Heat Pump Systems (No Aux. or Emergency Heat)  

Hot Water Zone Heat Only (Two Wire) Systems  

Hot Water Zone Heat Only (Three Wire) Systems  

Line Voltage Heating or Baseboard 110/240 Volt Systems  

Millivolt Systems Floor or Wall Furnaces  

12 VDC Mobile Home Application  

WIRE CUTTER/STRIPPER  

Failure to follow and read all instructions carefully  

beforeinstallingoroperatingthiscontrolcouldcause  

personal injury and/or property damage.  

Multistage Systems  

Systems Exceeding 30VAC, 1.5 Amp  

THERMOSTAT DETAILS  

REMOVING OLD THERMOSTAT  

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3

CAUTION  

Topreventelectricalshockand/orequipmentdamage,  

disconnect electric power to system at main fuse or  

circuit breaker box until installation is complete.  

!

Mounting  

Hole  

Before removing wires from old thermostat’s switching subbase,  

label each wire with the terminal designation it was removed  

from.  

W904  

W905  

RC  

Y

G

O

RH  

B

W

1. Remove OldThermostat: 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.  

Back of  

Thermostat Body  

Mounting  

Hole  

2. Shut off electricity at the main fuse box until installation is  

complete. Ensure that electrical power is disconnected.  

Base  

3. Remove the front cover of the old thermostat. With wires  

still attached, remove wall plate from the wall. If the old  

thermostathasawallmountingplate,removethethermostat  

and the wall mounting plate as an assembly.  

W904 - clip for Celcius display  

W905 - clip for hydronic system  

NOTE: Earlier models refer to 37-7006 for jumper locations.  

4. Identify each wire attached to the old thermostat using  

the labels enclosed with the new thermostat.  

Figure 1.Thermostat  

5. Disconnectthewiresfromtheoldthermostatoneatatime.  

DO NOT LET WIRES FALL BACK INTO THE WALL.  

6. Install new thermostat using the following procedures.  

PART NO. 37-6620B  

Replaces 37-6620A  

1026  

www.white-rodgers.com  

www.emersonclimate.com  

https://manual-hub.com/  

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General	Details
Name	White-Rodgers 1E78 Non Programmable Heat Only Thermostat User Manual
Make	WHITE RODGERS
Language	English
Filetype	PDF (Download)
File size	0.27 MB

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• ALL THERMOSTAT INSTRUCTIONS & USER MANUALS
• WHITE RODGERS

White-Rodgers 1E78 Non Programmable Heat Only Thermostat User Manual Overview

Summary of Contents

• Page 1: Preparations Assemble tools required as shown below. Failure to follow and read all instructions carefully before installing or operating this control could cause personal injury and/or property damage. Thermostat details 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. Removing old thermostat Remove old thermostat: A standard heat/cool thermostat consists of three basic parts: the cover, the base, and the switching subbase. Shut off electricity at the main fuse box until installation is complete. Ensure that electrical power is disconnected. Identify each wire attached to the old thermostat using the labels enclosed with the new thermostat. Disconnect the wires from the old thermostat one at a time. Do not let wires fall back into the wall. Install new thermostat using the following procedures.
• Page 2: CAUTION: Take care when securing and routing wires to avoid shorting to adjacent terminals or the rear of the thermostat. This product does not contain mercury, but may replace a unit that does. Do not open mercury cells and handle any spilled mercury with care. Mercury must not be discarded in household trash. Attach thermostat base to wall by removing packing material and connecting wires beneath terminal screws. Do not use on circuits exceeding specified voltage to avoid damage and hazards. Thermostat installation must conform to Class II circuits per the NEC code. This thermostat requires 2 “AAA” alkaline batteries to operate. The factory default setting is for forced air heat, but it can be adjusted for hydronic heating systems. Clipping jumper W905 on the circuit board will produce a longer heating cycle for hydronic systems.
• Page 3: Check thermostat operation to prevent static discharge problems. Contact a qualified service person if the system does not operate properly. Move the system switch to the heat position and ensure the pilot is lit if applicable. Adjust the thermostat setting above room temperature to start the heating system. Adjust the thermostat setting below room temperature to stop the heating system. Familiarize yourself with the thermostat features, display, and button operations. The thermostat consists of a body and a base, which can be removed and replaced. The display shows the current temperature and indicates low battery status. Temperature display adjustment can be made within a 3° range to match an old thermostat. The display backlight improves visibility in low lighting conditions.
• Page 4: 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: -40°F to 150°F. Electrical rating: 0 to 30 VAC 50/60 Hz. or D.C. For optimum performance, replace batteries once a year with fresh “AAA” alkaline batteries. Common problems for no heat include blown fuse, tripped circuit breaker, and pilot light not lit. Diagnostic: Set SYSTEM switch to HEAT and raise the setpoint above room temperature. If the thermostat does not click after being reset, contact your heating and cooling service person. The location of the thermostat may influence the cycle rate.