RT-SVX33E-EN
33
Start Up
Economizer Start-Up
Using the Service Test Guide in
Table 7, p. 31
, 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 in
Table 7, p. 31
, 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.
Scroll Compressors
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
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.
Note:
The Copeland, 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 and condenser fan have started
and operated for approximately 30 minutes, observe
the operating pressures. Compare the operating
pressures to the operating pressure curve in the
Service Facts.
3. Check system superheat. Follow the instruction listed
on the superheat charging curve in the Service Facts.
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.
6. The Copeland, 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.
Figure 26.
Compressor terminal box
