Typical Representation of a Unit Mount Control
Figure 37
THERMOSTAT KNOB
CAUTION
DO NOT rotate the thermostat knob back and forth from
heating to cooling. This causes the compressor to cycle on and
off rapidly and will cause damage to the compressor. Allow
the compressor to remain off for at least three minutes prior to
restarting the unit.
Remote-mounted thermostat
Use the thermostat to place the PTAC/PTHP in either the
1.
COOL
,
HEAT
, or
OFF
position. Test operation in all positions.
If the thermostat is fitted with a
2.
fan switch, set as desired places the
fan in either
ON
,
OFF
,
or
AUTO
. Test operation in all positions.
Check thermostat calibration for both heating and cooling op-
3.
eration.
Straight cooling PTAC's
Cooling cycle
Place the thermostat or system switch in the
1.
COOL
position.
Adjust the thermostat to a cooler temperature until the indoor fan
2.
starts running. The compressor and outdoor fan should then turn on
and cold air will begin to flow from the unit. Let the unit continue
operating to cool the room and remove humidity.
After the unit starts running and the space gets cooler, adjust the
3.
thermostat to a warmer temperature until the compressor cycles
off.
If a colder room temperature is desired, adjust the thermostat to a
4.
cooler temperature setting, turning the compressor and both fans
back on.
If a warmer room temperature is desired, adjust the thermostat to
5.
a warmer temperature setting. The compressor and outdoor fan
will stop and the indoor fan will switch off after the sixty-second
purge time has elapsed.
Place the thermostat or system switch in the
6.
OFF
position.
All operation should stop.
Final Inspection & Start-up
(continued)
Start Up
Ensure the unit is secure and level.
1.
Heat pump units only
2.
— Verify that the thermostatic drain
pan valve is operating correctly. The valve should be closed if the
temperature is above 60°F and open if the temperature is below
60°F.
If equipped, test the fresh air damper by setting the damper door
3.
switch to the "
YES"
position and verify the damper opens and
allows fresh air to be moved into the space. Then, set the damper
door switch to the "
NO"
position, and verify the flow of air into
the space has stopped. Fresh air will only be available when the
indoor fan is running.
Verify that the
4.
HP
jumper is set correctly for the unit type —
cooling only or heat pump unit (see Figure 34, page 27).
Set the
5.
TEST
jumper to
test mode
if desired. This will disable
time delays, including anti-short-cycle and purge times (see
Figure 35, page 27).
Verify that the unit is wired according to instructions in this
6.
manual, including requirements on page 26.
Connect Electric power to the unit .
7.
Turn on the unit to check for proper operation. Check conden-
8.
sate removal by pouring water into the base pan, putting the unit
in cooling mode, and with the condenser fan running, seeing
if water is picked up by the slinger ring and thrown onto the
outdoor coil.
NOTICE
The compressor will not start until the anti-short time period
has elapsed. On power-up, there will also be delays for control
board initialization and random-start timing. See “Sequence of
Operation” on page 24.
Unit-mounted thermostat
Use the system switch to place the PTAC/PTHP in either the
1.
COOL
,
HEAT
, or
OFF
position (see Figure 37). Test operation
in all positions.
Use the fan speed switch places the fan in either
2.
LOW
or
HIGH
speed
(see Figure 37). Test operation in both positions for heating and
cooling.
Test operation of the Fan Cycle switch (this is a toggle or rocker
3.
switch on side of control box), with switch set at ON (continuous
fan operation) or AUTO (cycling with thermostat) for both heat-
ing and cooling. Set the switch in the desired position.
Rotate the thermostat knob to the left to increase setpoint temperature,
4.
or to the right to decrease (see Figure 37). Turning the unit-mount-
ed 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. The setting can be adjusted for personal comfort.
Replacement Packaged Terminal Air-Conditioning / Heat Pump
• Installation, Operation, and Maintenance Manual •
The Right Fit for Comfort
28
P/N 240008034, Rev. D [7/29/2011]
