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RT-SVX26K-EN

Start Up

Economizer Start-Up

Using the Service Test Guide in

Table 12, p. 36

momentarily jump across the Test 1 and Test 2 terminals
on LTB1 one-time to start the Minimum Ventilation Test.

Set the minimum position setpoint for the economizer
to the required percentage of minimum ventilation
using the setpoint potentiometer located on the
Economizer Control (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 and 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

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 12, p. 36

continue the Service Test start-up procedure for each
compressor circuit.

Momentarily jump across the Test 1 and Test 2
terminals on LTB1 one additional time if continuing
from previous component start-up or until the desired
startup component Test is started.

Scroll Compressors

a. Once each compressor has started, verify that the

rotation is correct. If wired correctly the suction
pressure should drop and the discharge pressure
should rise. If a scroll compressor is rotating
backwards, it will not pump and a loud rattling
sound can be observed.

b. If the electrical phasing is correct, 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. Do not allow the compressor to
operate backwards for more than 5 seconds.
Operation for a period of time longer than this will
result in compressor damage. Copeland (Alliance)
will experience failure also. If the compressor runs
backward for an extended period, the motor
winding can overheat and cause the motor winding
thermostat to open.

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

Table 13, p. 37

. The

appropriate oil charge is listed in

Table 14, p. 38

Figure 29.

Compressor terminal box

Table 13. Compressor types

Tonnage

YS*150

SSA067

SSA054

YH*150