Honeywell CT50 Series Owners Manual

Honeywell CT50 Series Owners Manual

Vertical Mount:
CT50 (24 Vac heating systems)
CT51 (24 Vac heating and cooling systems)
CT53 (750 mV or 12Vdc heating systems)
Horizontal Mount:
CT54 (24 Vac heating systems)
CT55 (24 Vac heating and cooling systems)

Honeywell CT50 Series Temperature Control Range

• 45°–95°F (7°–35°C)
• 35°–85°F (2°–29°C); select models; for garages or other outbuildings.

Honeywell CT50 Series Getting started

Check package contents:

• Thermostat
• Wall anchors & screws (2 each)
• Wire labels

Before you begin, make sure you have:

• No. 2 Phillips & small pocket screwdrivers
• Hammer
• Level (optional)
• Pencil
• Drill and bit (3/16” for drywall, 7/32” for plaster)

Remove your old thermostat

TURN OFF POWER at heating/cooling system (or fuse/circuit-breaker panel). Remove cover and thermostat, but leave wallplate with wires attached.

Leave wallplate in place.

Label wires and remove old wallplate

Use a screwdriver to disconnect wires one by one. As you disconnect each wire, wrap it with the label matching the letter on your old thermostat. (Adhesive labels are supplied in your thermostat package.)

Remove the old wallplate only after all wires are labeled. Be careful not to let loose wires fall into the wall opening.

Wrap supplied labels securely around each wire. Do not let wires fall into wall opening!

For CT50/CT53/CT54: If your old thermostat has 3 or more wires (not counting terminals C or C1),

For CT51/CT55: If your old thermostat has 7 or more wires (not counting terminals C or C1),

Mark mounting position

Mount thermostat base

Connect wires

Wiring CT50/CT53/CT54 • 2-wire heat-only system: Connect one wire to R terminal, one wire to W terminal.

Wiring CT51/CT55

1. If wires will be connected to both R and Rc terminals, remove the metal jumper.
2. Do not connect both O and B if you have a heat pump. Connect only the O wire. Wrap B wire with electrical tape and do not use.
3. Do not use C, X or B. Wrap bare end of wire with electrical tape.

Set fan operation switch (CT51/CT55)

Move the switch to the proper setting for your system:

F: For gas or oil heating systems, leave the fan operation switch in this factory-set position (for systems that control the fan in a call for heat).

E: Change the switch to this setting for heat pump or electric heat systems. (This setting is for systems that allow the thermostat to control the fan in a call for heat, if a fan wire is connected to the G terminal.)

Set heat anticipator (select models)

Finish installation

1. Align the slots on the cover with tabs on the sides of the base, then push gently until the cover snaps into place.
2. Restore power at the heating/cooling system, or at the fuse/circuit-breaker panel.

Operation

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