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Honeywell Q539 Installation Instructions

Subbases
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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.
Model Description
Q539A provides system and fan switching and cooling
anticipator for heating cooling systems. Includes indicator
LOCKOUT LED for use in oil burner systems.
Q539H provides fan switching with Z terminal for low voltage
fan switch to control fan in AUTO position.
Q539J provides system switching for control of heating and
cooling for heat pump and electric heating. Auto fan operates
through fan relay on both heating and cooling.
TABLE 2—TERMINAL DESIGNATIONS.
Terminal
R
Transformer.
a
RC
Cooling Transformer.
b
RH
Heating Transformer.
W
Heating Relay or Valve Coil.
Y
Cooling Contactor Coil.
c
B
Heating Damper Motor or Changeover
Valve (if used).
d
O
Cooling Damper Motor or Changeover
Valve (if used).
G
Fan Relay Coil.
e
X
Clogged Filter Switch or Lockout Switch
(primary control).
P
Heat Pump Contactor Coil.
Z
Q539H low voltage fan switch for control
of fan relay in AUTO position for both
heating and cooling control.
a
Cooling transformer in systems with separate heating and
cooling circuits.
b
Heating transformer in systems with isolated heating and
cooling circuits.
c
Circuit only completed between R and B with system
switch in HEAT position.
d
Circuit only completed between R and O with system
switch in COOL position.
e
Only available on subbases with indicator LEDs.
®U.S. Registered Trademark
Copyright © 2002 Honeywell •
Q539A, H and J Subbases
Installation Instruction for the Trained Service Technician.
TABLE 1—SUBBASE SPECIFICATIONS.
Connection
• All Rights Reserved
System
Fan
Switch
Switch
HEAT-
AUTO-ON RH
OFF-
COOL
NONE
AUTO-ON R-W-Y-G-X-Z
HEAT-
AUTO-ON R-W-Y-G-X-P-O-B
OFF-
COOL
M3375
This control contains mercury in a sealed tube. Do not
place control in the trash at the end of its useful life.
If this control is replacing a control that contains mer­
cury in a sealed tube, do not place your old control in the
trash.
Contact your local waste management authority for
instructions regarding recycling and the proper disposal of
this control, or of an old control containing mercury in a
sealed tube.
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.
LOCATION
Locate the subbase about 5 ft (1.5m) above the floor in
an area with good air circulation at average temperature.
Application
Terminals
RC-W-Y-G-X
-
Mercury Notice
Installation
95-6486-9
See
Fig.
3
4
5

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  Summary of Contents for Honeywell Q539

  • Page 1 Installation Instruction for the Trained Service Technician. 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.
  • Page 2 Do not mount the subbase where it may be affected by: Fig. 1—Level Q539 using a spirit level . — drafts or dead spots behind doors or in corners. — hot or cold air from ducts. — radiant heat from the sun, fireplaces, or appliances.
  • Page 3: Fan Switch

    HEATING SWITCHING FOR AUTO Move the system switch on the Q539 to HEAT and the fan switch to AUTO. Move the heating setpoint dial to about 6AC (10AF) above room temperature. Heating equipment should start and the fan should run. Change the setpoint to X TERMINAL IS USED ON Q539 MODELS WITH about 6AC (10AF) below the room temperature.
  • Page 4 Move the system switch on the Q539 to COOL and the fan switch to AUTO. Move the cooling setpoint dial to about 6AC (10AF) below room temperature. Cooling equipment should start and the fan should run.

This manual is also suitable for:

Q539aQ539hQ539j