Start Up; Economizer Start-Up; Compressor Start-Up - Trane Axiom GWS Series Installation, Operation And Maintenance Manual

Start Up

Economizer Start-Up

Using the service test guide for component operation
table, momentarily jump across the Test 1 & Test 2
terminals on LTB1 one time to start the Minimum
Ventilation Test.
1. Set the minimum position setpoint for the
economizer to the required percentage of minimum
ventilation using the setpoint potentiometer located
on the Economizer Control Actuator (ECA).
The economizer will drive to its minimum position
setpoint, exhaust fans (if applicable) may start at
random, and the supply fan will start when the
SERVICE TEST is initiated.
The Exhaust Fan will start anytime the economizer
damper position is equal to or greater than the
exhaust fan setpoint.
2. Verify that the dampers stroked to the minimum
position.
3. Momentarily jump across the Test 1 & Test 2
terminals on LTB one additional time if continuing
from previous component start-up or until the
desired start-up component Test is started.
4. Verify that the dampers stroked to the full open
position.
5. To stop the SERVICE TEST, turn the main power
disconnect switch to the "Off" position or proceed
to the next component start-up procedure. Remove
electro mechanical test mode connections (if
applicable).

Compressor Start-Up

1. Attach a set of service gauges onto the suction and
discharge gauge ports for each circuit. Refer to the
refrigerant circuit illustration in the Service Facts.
Using the Service test guide for component
operation table, continue the Service Test start-up
procedure for each compressor circuit.
Momentarily jump across the Test 1 & Test 2
terminals on LTB1 one additional time if continuing
from previous component start-up or until the
desired start-up component Test is started.
S S c c r r o o l l l l C C o o m m p p r r e e s s s s o o r r s s
a. Once each compressor has started, verify that
the rotation is correct. To check rotation, use a
set of refrigeration gauges hooked up to the
suction and discharge pressure port. If the
compressor is phased correctly the suction
pressure should drop and the discharge
pressure should rise when the compressor
starts and runs. If a scroll compressor is rotating
backwards, it will not pump, the suction and
discharge pressure will not rise, and a loud
58
rattling sound can be observed.
b. If the electrical phasing is incorrect, before
condemning a compressor, interchange any two
leads (at the compressor terminal block) to
check the internal phasing. Refer to the
following illustration for the compressor
terminal/phase identification. If the compressor
runs backward for an extended period not to
exceed 5 seconds, the compressor will be
damaged the motor winding can overheat and
cause the motor winding thermostat to open
and the oil can turn dark gray.
c. Check the compressor oil levels. The oil level in
each compressor sight glass should be visible in
the compressor sightglass. This only applies to
CSHD compressors, SSA and SPA compressors
don't have sight glasses.
N N o o t t e e : : SSA and SPA scroll compressors for R-410A
units use Trane OIL00094. The correct oil for
Trane CSHD is Trane OIL00079 or OIL00080.
Compressor types are listed in the table
below. The appropriate oil charge is also
listed below
2. After the compressor starts and operates for
approximately 30 minutes, observe the operating
pressures. Compare the operating pressures to the
operating pressure curve.
3. Check system superheat. Follow the instruction
listed on the superheat charging curve. Superheat
should be within ±5ºF of the superheat chart value.
4. Repeat steps 1 through 4 for each refrigerant circuit.
5. To stop the Service Test, turn the main power
disconnect switch to the "Off" position or proceed
to the next component start-up procedure.
SSA and SPA scroll compressors for R-410A units use
Trane OIL00094. The correct Oil for Trane CSHD is
Trane OIL00079 or OIL00080. Compressor types are
listed in the following table. The appropriate oil charge
is also listed below.
WSHP-SVX015C-EN