Honeywell CT87A round Installation Instructions Manual
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Honeywell CT87A round Installation Instructions Manual

Low voltage (15 to 30 vac), thermostat and mounting hardware
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CT87A,B,J Round
1
Verify that you have the
right thermostat
Using the compatibility chart
below, verify that you purchased
the right CT87 thermostat for
your heating/cooling system. If
you are unsure which model is
right for your system, visit
www.honeywell.com/
yourhome or call Honeywell
Customer Relations at
1-800-468-1502.
Heating/Cooling system
Heating only: Gas or oil fueled warm air, steam, or hot
water heat
Cooling only: Electric air conditioning
Heating and cooling: Gas or oil fueled warm air,
steam, or hot water heat with electric air conditioning
Single stage heat pump: Outdoor heating/cooling unit
(compressor) with no auxiliary or backup heat.
Electric heat furnace with or without cooling:
Electric baseboard: Electric heating strips located just
above the floor, usually 120–240 volts
Multistage: A conventional system with more than one
stage, or an outdoor heating/cooling unit (compressor)
with auxiliary or backup heat.
* CT87A is compatible with 2-wire cooling-only systems.
® U.S. Registered Trademark
Copyright © 2001 Honeywell
All Rights Reserved
LOW VOLTAGE (15 TO 30 VAC),
THERMOSTAT AND MOUNTING HARDWARE
®
Thermostat

Installation Instructions

Compatible with:
CT87A
CT87B
YES
YES
YES*
YES
No
YES
No
No
No
No
No
No
No
No
CT87J
No
YES
No
YES
YES
No
No
  

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  • Page 1: Installation Instructions

    CT87 thermostat for your heating/cooling system. If you are unsure which model is right for your system, visit www.honeywell.com/ yourhome or call Honeywell Customer Relations at 1-800-468-1502. Compatible with: Heating/Cooling system CT87A CT87B...

  • Page 2: Remove The Old Thermostat

    CT87A,B,J ROUND® THERMOSTAT Prepare for installation 1. Carefully unpack your new thermostat; rough handling may affect its accuracy. Save your receipt and identify the following parts: • CT87 thermostat • Screws: two 1-inch sheet metal screws, two 1/2-inch binding head screws, and two 1/4-inch round head screws •...

  • Page 3: Install Cover Ring, Wallplate Or Subbase

    CT87A,B,J ROUND® THERMOSTAT 5. Label the wires using the wiring Fig. 2 labels that came with the CT87. Identify each wire using the letter of the terminal on the old thermo- stat to which it is attached (Fig. 2). Do not label the wires by color. 6.
  • Page 4 CT87A,B,J ROUND® THERMOSTAT 1. If using the cover ring: Position the cover ring against the wall so that the arrow in the middle of the cover ring is pointing up. 2. Position the wallplate or subbase. • If using cover ring: Place the wallplate/subbase over the cover ring.
  • Page 5 CT87A,B,J ROUND® THERMOSTAT 1. Place the cover ring against the outlet box so that the arrow in the middle of the cover ring is pointing up. 2. Pull the wires through the wiring hole on the bottom left side of the cover ring.

  • Page 6: Wire The Thermostat

    CT87A,B,J ROUND® THERMOSTAT Wire the thermostat 1. Use the wiring cross-reference table below to match each old thermostat wire with its corresponding terminal on the CT87 wallplate or subbase. See Figs. 8–13 for wiring diagrams. Wiring cross-reference Connect to Connect to Connect to Wire label CT87A...
  • Page 7 CT87A,B,J ROUND® THERMOSTAT Fig. 8–(CT87A for a 2-wire heating only system) CT87A WALLPLATE POWER SYSTEM HEAT M20183 Fig. 9–(CT87A for a 3-wire hot water heating only system) CT87A WALLPLATE WIRE LABELS (LETTERS ON ORIGINAL THERMOSTAT TERMINALS) 3-WIRE HOT WATER ZONE VALVE M20184 Fig.
  • Page 8 CT87A,B,J ROUND® THERMOSTAT Fig. 11–(CT87B for a 5-wire heating/cooling system) CT87B SUBBASE HEATING POWER SYSTEM COOLING POWER SYSTEM COOL HEAT M20225 Fig. 12–(CT87J for a 4-wire single stage heat pump). CT87J SUBBASE HEAT SYSTEM POWER COOL REVERSING VALVE HEAT REVERSING VALVE DO NOT ATTACH WIRES TO BOTH B AND O JUMPER W TO Y...

  • Page 9: Mount The Thermostat

    CT87A,B,J ROUND® THERMOSTAT Mount the thermostat 1. Pull off the thermostat cover and discard the red plastic insert that holds the mercury switch in place during shipping. 2. Using a pencil point, slide the heat anticipator indicator to 1.2 on the scale as shown in Fig.

  • Page 10: Check Heating

    CT87A,B,J ROUND® THERMOSTAT Set the heat anticipator for your system IMPORTANT: Setting the heat anticipator allows the thermostat to maintain accurate temperature control. 1. Using a pencil point, move the heat anticipator pointer to the number that you recorded in step 3, sub-step 3. If you could not find the antic- ipator setting on the old thermostat, use the setting for your type of system shown in the table below.

  • Page 11: Operation

    CT87A,B,J ROUND® THERMOSTAT Check cooling IMPORTANT: To avoid damaging the compressor in the air conditioner, do not operate the cooling system when the outdoor temperature is below 50°F (10°C). 1. If your CT87 has a subbase, set the system switch on the left to COOL.
  • Page 12 CT87A,B,J ROUND® THERMOSTAT Limited One-Year Warranty Honeywell warrants this product, excluding battery, to be free from defects in the workmanship or materials, under normal use and service, for a period of one (1) year from the date of purchase by the consumer.

This manual is also suitable for:

Ct87b roundCt87j round

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