DURASTAR DRAH1T - Start-Up; Pre-Start Checklist; System Start-Up and Operational Check-Out; Sequence of Operation

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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 operation of the controls, air-ow, and refrigerant charge. If the controls are not found
to be functioning properly, or the air-ow or refrigerant charge are not within specica-
tions, 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 DRAH1T 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 satised or turned to the off position. The G and Y inputs
from the thermostat are de-energized. A time delay programmed into the DRAH1T
motor keeps the blower motor energized for an additional 30 seconds to extract the
residual cooling from the cold indoor coil before it shuts down. If the thermostat is set
for continuous fan operation, the motor continues to operate when the call for cooling
ends. The air-ow on an DRAH1T air-handler will be reduced to the continuous fan
speed.
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 lter 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?
Refer to outdoor unit installation instructions for system
start-up instructions and refrigerant charging instructions.
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