41
PRE-START CHECKLIST
Is unit properly located, level, secure and service-
able?
Has auxiliary pan been provided under the unit with
separate drain? (Units installed above a finished
ceiling).
Is condensate line properly sized, run, trapped,
pitched and tested?
Is ductwork correctly sized, run, taped and insu-
lated?
Have all cabinet openings and wiring been sealed
with caulking?
Is the filter clean, in place and of adequate size?
Is the wiring tight, correct and to the wiring diagram?
Is the unit properly grounded and protected (fused)?
Is the thermostat heat anticipator been set properly?
Is the unit circuit breaker(s) rotated properly “on” up
- “off” down?
Are the unit circuit breaker(s) line lug cover(s) in
place?
Are all access panels in place and secure?
m
YES
m
NO
m
YES
m
NO
m
YES
m
NO
m
YES
m
NO
m
YES
m
NO
m
YES
m
NO
m
YES
m
NO
m
YES
m
NO
m
YES
m
NO
m
YES
m
NO
m
YES
m
NO
m
YES
m
NO
Refer to outdoor unit installation instructions for system
start-up instructions and refrigerant charging instructions.
4.0 START-UP
4.1 PRE-START CHECKLIST
4.2 SYSTEM START-UP AND OPERATIONAL CHECK-OUT
After the air-handler and other system components have been installed and the Pre-Start
Checklist has been completed, the system should be started up and an operational check-
out should be performed. The operational check-out includes checking sequence of opera-
tion of the controls, air-flow, and refrigerant charge. If the controls are not found to be func-
tioning properly, or the air-flow or refrigerant charge are not within specifications, corrective
action must be taken. The following sections are provided to assist the installer with the
operational check-out.
4.3 SEQUENCE OF OPERATION
4.3.1 COOLING MODE
When the thermostat calls for cooling, the G terminal on the blower control board is
energized which in turn energizes the indoor blower motor. This causes the indoor blow-
er to circulate air through the air-handler and duct system during the cooling cycle. For
(-)H1T air-handlers, the Y terminal on the blower control board is also energized which
tells the blower control board to energize the cooling speed on the motor instead of the
reduced CFM continuous fan speed.
When the thermostat call is satisfied or the thermostat is turned to the off position. The G
and Y terminals on the blower control board are de-energized. A time delay programmed
into the (-)H1P blower control board or (-)H1T motor keeps the blower motor energized
for an additional 30 seconds to extract the residual cooling from the cold indoor coil.
4.3.2 ELECTRIC HEAT MODE
When the thermostat calls for the 1st stage of heat, the W1 terminal on the blower con-
trol board is energized. This energizes the indoor blower motor and all of the electric
heater elements for heater kits with 10kW of heat or less and the 1st stage elements for
13kW heater kits and higher. If W1 and W2 thermostat pigtails at the air-handler are
wired together on 13kW heater kits and higher, all of the elements to be energized. For
13kW heater kits and higher, a 2-stage heat thermostat can be used to energize the W2
