34
Startup
(See back of the manual for startup form)
During startup, it is necessary to perform
routine checks on the performance of the
unit. This includes checking of the air flow,
the air filters, and water flow. Due to the
charge-critical nature of these units,
refrigerant pressure gauges must only be
hooked up to the unit if there is suspicion of
an issue within the circuit.
Supply Fans
WSHP Series units are equipped with direct
drive forward curved or backward curved
plenum supply fan assemblies that deliver
the air volume specified according to unit
size and job requirements.
Figure 24 - WSHP Series Supply Fan
Fan Air Flow Adjustment
A specific air volume is delivered by the
PSC or Electronically Commutated Motor
(ECM) fans. Field airflow adjustment may
be required at startup.
Standard PSC and ECM motor options have
limited RPM Adjustment to adjust airflow.
Each motor type has three speed taps to
select from: High, Medium, and Low.
Adjustment for the PSC speed must be made
by altering the motor power connected to the
motor. Adjustment for the ECM speed is
made by adjusting the call wire to the
corresponding 1/4” speed terminal directly
on the motor body (WH015 - 060).
Adjustment for the A cabinet units (WH006-
012) is made by adjusting the DC voltage
signal to the motor from the Pioneer
Expansion board or the Pioneer Gold board.
Low fan speed is achieved by connecting the
compressor Y call from the thermostat to Y1
Improper installation, adjustment,
alteration, service or maintenance
can cause property damage,
personal injury or loss of life. Startup
and service must be performed by a
Factory Trained Service Technician.
Keep a copy of this IOM with the unit.
Electric shock hazard. Shut off all
electrical power to the unit to avoid
shock hazard or injury from rotating
parts.
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