21
• exposed to direct light and heat from
a lamp, sun, fireplace, or other heat-
radiating object which may cause a
false reading.
• close to or in direct airflow from
supply registers and return-air grilles
• In areas with poor air circulation,
such as behind a door or in an alcove
Refer to thermostat wiring diagram and
thermostat installation instructions for
further details.
START-UP PROCEDURE
(HEATING ONLY):
The following conditions must be met
prior to unit start-up.
Debris from soldering and/or other
installation activities can cause
equipment failure. Ensure that all
associated lines and appurtenances
are free of debris.
Check to ensure that unit is secure.
Check that blower wheel rotates freely
within the scroll housing.
Check all wiring to ensure that
connections are tight.
Check all ductwork and pipe
connections to ensure proper seal.
Check to ensure that all packaging
wraps are removed from equipment.
Ensure that front access doors are
properly installed.
Check to ensure proper connection(s)
to the appropriate blower speed tap
(Heat /Cool – High and Low). Refer to
Dry Air Delivery Table and/or the
appropriate wiring diagram(s) in this
manual.
Perform all safety and start-up checks
for Tankless Water Heater as per
manufacturer’s instructions.
Having verified all preceding checks,
the Air Handler’s Start-Up Procedure is
as follows:
STEP 1: Purge and fill system; follow
appropriate purging procedure as laid
out in this manual in section titled
“Purging and Priming the System”.
STEP 2: Turn on power supply to air
handler. Caution: blower and/or
circulator may start to operate if
thermostat is on and a call is present.
STEP 3: Turn thermostat ON and
switch system to the heating mode.
The thermostat shall be set higher than
the actual room temperature; this will
cause the circulator to energize and
initiate the heating cycle. (If the pump
does not start, or the Air Handler is not
producing heat, refer to the
Troubleshooting Section, in this
manual).
STEP 4: Program room thermostat as
desired by homeowner.
START-UP PROCEDURE
(COOLING SYSTEM)
Refer to field-supplied evaporator coil
and outdoor unit manufacturer’s
Installation Instructions for system
hook-up, start-up instructions and
refrigerant-charging method details.
TROUBLESHOOTING BLOWER
AND/OR PUMP MOTOR AND
CONTROLS
If blower and/or pump motor does
not run:
Turn OFF power and check the
following:
1. Check that door switch is in the
CLOSED position.
2. Check 3 amp fuse on Printed
Circuit Board (PCB).
3. Check for 24 VAC between COM
and 24 VAC on IAC. If no voltage
is present, check transformer.
4. Check all connections for kinks
which could cause loose
connections. Ensure connections
are secure.
5. Verify that approximately 120
VAC is present across L1 and L2.
FIGURE 15
DIP SWITCH POSITIONS
SINGLE-STAGE A/C
CONFIGURATION
(DEFAULT)
SINGLE-STAGE HP
CONFIGURATION
1
O
N
2
3
4
1
O
N
2
3
4
30 SECONDS OFF
DELAY (DEFAULT)
60 SECONDS OFF
DELAY
1
O
N
2
3
4
1
O
N
2
3
4
90 SECONDS OFF
DELAY
120 SECONDS OFF
DELAY
1
O
N
2
3
4
1
O
N
2
3
4
1
O
N
Key:
Switch is in the ON position.
Switch does not affect this setting.
1
O
N
Switch is in the OFF position.
TWO-STAGE A/C
CONFIGURATION
TWO-STAGE HP
CONFIGURATION
1
O
N
2
3
4
1
O
N
2
3
4