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The Right Fit For Comfort
11
RIGHT
WRONG
FINAL INSPECTION AND START-UP
1. Make sure the chassis is level. Check by pouring
water into the drain pan and making certain it flows
through the drain hoses to the condenser side of
the unit.
2. Plug or hard wire line voltage to unit.
IMPORTANT: Follow the information provided on the
rating plate for voltage and amperage/fuse size for proper
supply.
3. Turn the power on.
4. Check for proper operation (i.e., cooling, optional
fresh air, and heating if supplied).
RETROAIRE PTAC OPERATION
UNIT MOUNTED AND REMOTE
THERMOSTAT CONTROLS
RetroAire units can be equipped with unit mounted or
remote controlled thermostats. Turning the unit
mounted thermostat knob to the far left will produce
the warmest room temperature while turning it all the
way to the right will produce the coolest. These settings
can be adjusted for personal comfort.
RC/RH30 SAFETY NOTE
When turning the selector knob on the RC/RH30 for
mode of operation, it is very important to make sure
the knob position is
“SEATED”
directly on a mode of
operation
(clicks into position)
.
Do not mistakenly
place between two positions.
This can result in a
potential fan failure while the system is in a cooling
or heating operation. A fan failure could result in the
unit overheating (smoke) in an electric heating mode
or freezing coil in a cooling mode.
Units with remote thermostats will require operation
according to standard thermostat settings. Refer to the
operating instructions for the specific thermostat used.
CHOOSING A THERMOSTAT
EMI offers a thermostat that is compatible with your PTAC/
PTHP unit. Select EMI part number 240-2960 from the
latest Retroaire price list for this option. 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 heating or cooling range
of the thermostat. If a non-mercury, electronic thermostat
is needed, then choose EMI part number 240-3926.
SELECTING A THERMOSTAT “By Others”
When selecting a thermostat other than those offered by
EMI, it is important to choose a single stage heat/cool,
24V thermostat. For models 09-17, do NOT select a
thermostat that requires connection to a “C” terminal since
these units do not have provisions for connecting to a “C”
terminal. Only models 19 and 24 have provisions for
connecting a “C” terminal to the unit.
If a thermostat without a “C” terminal is used in a models
19 or 24, then it is important to insulate the unused
BROWN “C” low volt wire to prevent it from shorting at the
thermostat.
COOLING ONLY WITH ELECTRIC HEAT OR
HYDRONIC HEAT
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 (RH - PTHP’S)
Select a thermostat that is compatible with a cooling -
single stage heat - heat pump system. The thermostat
should have “R”, “Y”, “O” and “G” terminals. Retroaire units
are single stage heating only. The electric heat and heat
pump will not operate simultaneously.
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.
TEMPERATURE
Figure 6
COLD
HEAT
