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1 60-2241—8
T4039 Thermostats Control Line Voltage Valves of
a fan coil unit in cooling, manual changeover heat-
ing-cooling, or automatic changeover heating-cool-
ing systems. One or two valves may be controlled
directly by the thermostat. The fan switch (where
applicable) controls air circulation.
T4039A,B,D-M,S,V
Line Voltage Cooling and
Heating-Cooling Thermostats
J. H. • Rev. 10-92 • ©Honeywell Inc. 1992 • Form Number 60-2241—8
■ Color-coded leadwires.
■ All models can be mounted on standard vertical
outlet boxes. Models with manual switching can be
mounted on 4 in. square junction boxes or 2-
ganged outlet boxes.
■ Adjustable range stops limit temperature adjust-
ment or lock at selected setpoint.
■ Models available with separate power source for
fan and thermostat.
■ 1-, 2-, or 3-speed manual fan control available.
■ Positive deadspot separates heating-cooling circuits
in automatic models. Remote changeover switch is
required to separate circuits in manual changeover
heating-cooling models.
■ Scale range is approximately 55° F to 95° F [13° to
35° C] in 10° F [6° C] increments from 75° F [24°
C] midpoint. Scale is marked COOL-WARM.
■ Cooling circuit breaks in FAN-OFF position to re-
duce condensation problems in the fan coil unit.
CONTENTS
Specifications ................................................. 2
Ordering Information ..................................... 2
Installation ..................................................... 5
Operation ....................................................... 8
Checkout ......................................................... 8