RT-SVX23D-EN 45
Start-Up
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.
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.
Compressor Start-Up
Using the Service Test Guide in Tab le 7, continue the SERVICE TEST start-up procedure for each
compressor circuit.
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.
2. 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.
Scroll Compressors
a. Once each compressor has started, verify that the rotation is correct. 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. If the compressor
runs backward for an extended period (15 to 30 minutes), the motor winding can overheat
and cause the motor winding thermostat to open.
3. 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.
4. Check system superheat. Follow the instruction listed on the superheat charging curve in the
Service Facts.
Superheat should be within ±5 F of the superheat chart value.
5. Repeat steps 1 through 4 for each refrigerant circuit.
6. To stop the SERVICE TEST, turn the main power disconnect switch to the “Off” position or
proceed to the next component start-up procedure.
Heating Start-Up
Using the Service Test Guide in Tab le 7, continue the SERVICE TEST start-up procedure for each
compressor circuit.
1. Clamp an amp meter around one of 1st stage heater power wires at the heater contactor.
2. 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.
3. Verify that the heater stage is operating properly.
4. Clamp an amp meter around one of 2nd stage heater power wires at the heater contactor (if
applicable).
5. 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.
6. Verify that the heater stage is operating properly.
7. To stop the SERVICE TEST, turn the main power disconnect switch to the “Off” position or
proceed to the next component start-up procedure.
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