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Enviromaster International, LLC
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2. Connect low voltage wiring from thermostat to
unit.
IMPORTANT:
The outdoor air sheet metal splitter
baffle must be in the proper position to prevent re-
circulation.
3. Turn power on and check for proper operation.
HEATING:
Set the wall thermostat to heat mode.
Set the thermostat above the room setting. Allow
some time for heat to come from the discharge
grilles. Do not operate unit when the panels are
removed.
COOLING:
Set the wall thermostat to cool mode.
Set the thermostat below the room temperature set-
ting and allow time for cool air to come from the
discharge grilles. The thermostat can be set at the
most desired setting with the selector switch in the
heat or cool position.
4. Make sure that there is nothing to interfere with
the room discharge air or the return air.
WARNING
Do not operate unit without filter in place or use as
a temporary heating/cooling source during con-
struction.
MANUAL FRESH AIR DAMPER
The fresh air manual damper allows the user to move
fresh air into the space to be conditioned. The damper
handle is located behind the evaporator coil. To ac-
cess, slide access door on service panel and slide
fresh air door to desired position.
SEQUENCE OF OPERATION
CHOOSING A THERMOSTAT
Enviromaster International offers a thermostat that is
compatible with the VPAC/VPHP 30-36. This is a single
stage cool/heat, mercury bulb thermostat that can be
used in all Retroaire cooling, heating or heat pump
applications. The thermostat has an adjustable set-
point range of between 55°F and 95°F. There are two
independent, adjustable stops that can limit the heat-
ing or cooling range of the thermostat. A non-mer-
cury, electronic thermostat is available if needed.
Please contact the factory for more information.
SELECTING A COMPATIBLE THERMOSTAT
When selecting a thermostat other than those offered
by Enviromaster International, it is important to choose
a single stage heat/cool, 24V thermostat.
COOLING ONLY WITH ELECTRIC OR
HYDRONIC HEAT (VPAC ONLY)
Select a thermostat that is compatible with a cooling -
electric heat system. The thermostat should have “R”,
“Y”, “W” and “G” terminals.
HEAT PUMP WITH ELECTRIC HEAT
(VPHP ONLY)
Select a thermostat that is compatible with a cooling -
single stage heat - heat pump system. The thermo-
stat should have “R”, “Y”, “O” and “G” terminals.
Retroaire™ units are single stage heating only. The
electric heat and heat pump will not operate simulta-
neously.
FAN OPERATION
Some thermostats are equipped with an auto/on fan
switch. When this switch is placed in the on position
the indoor fan will run continuous. When the switch is
in the auto position the indoor fan will cycle with the
call for heating or cooling.
FAN PURGE (AUTO MODE ONLY)
After the room thermostat has been satisfied, the purge
feature allows the indoor fan to remain on for an addi-
tional 60 seconds. This increases efficiency by pulling
the remaining energy from the unit.
COOLING OPERATION
After connecting the thermostat to the unit place the
system switch in cool mode. Adjust the set-point tem-
perature below the room temperature. The compres-
sor and fan motors will start and cooling will begin.
Place the set-point temperature above the room tem-
perature. The compressor and condenser fan will stop
and the indoor fan will remain on for an additional sixty
seconds.
IMPORTANT:
The start of the compressor will not
take place until the anti-short/random start time
period has elapsed.
