Honeywell Q539A Manual

Honeywell Q539A User Manual

Honeywell Q539A, H and J Subbases Application

Q539 Subbases provide cooling anticipators, and mounting for T87F Thermostats. Q539 Subbases also provide system and fan switching for heating, cooling, and heating-cooling thermostats. For subbase specifications, refer to Tables 1 and 2.

Honeywell Q539A Installation

WHEN INSTALLING THIS PRODUCT…

1. Read these instructions carefully. Failure to follow instructions can damage product or cause a hazardous condition.
2. Check ratings given in instructions and on product to make sure product is suitable for your application.
3. Make sure installer is a trained, experienced service technician.
4. After completing installation check out product opera tion as provided in these instructions.

Do not mount the subbase where it may be affected by:

• drafts or dead spots behind doors or in corners.
• hot or cold air from ducts.
• radiant heat from the sun, fireplaces, or appliances.
• concealed pipes and chimneys.
• unheated (uncooled) areas such as an outside wall.

LOCATION
Locate the subbase about 5 ft (1.5m) above the floor in an area with good air circulation at average temperature.

Honeywell Q539A MOUNTING AND WIRING

Disconnect power supply before beginning installation to prevent electrical shock or equipment damage. All wiring must comply with local codes and ordinances.

1. In replacement applications, check the existing subbase wires for cracked or frayed insulation. Replace any wires in poor condition. If the wire is plastered into the wall, make a hole next to the wires and loosen the wires so that the wires can be pushed back into the wall later.
2. In new installations, run wiring (if necessary) to the subbase location. IMPORTANT: To prevent interference with the thermostat linkage, keep wire length to a minimum and run wires as close as possible to the subbase.
3. Connect the wires to the terminals inside the subbase. Refer to equipment manufacturer instructions for Q539 wiring diagrams. If not available, refer to Fig. 1 through 5.
4. Push excess wire back through the hole and plug any opening with insulation to prevent drafts that can affect performance.
5. Loosely fasten the thermostat subbase to the wall with a screw through the left mounting hole. Adjust the subbase so it is approximately level and start the second screw through the right mounting slot. Do not tighten.
6. Level the thermostat subbase using a spirit level as shown in Fig. 1.
7. Tighten mounting screws. IMPORTANT: An incorrectly leveled subbase will cause the temperature control to deviate from setpoint.
8. Mount and wire the thermostat to the thermostat sub base using the equipment manufacturer’s instructions.

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