Start-Up
RT-SVX23F-EN 41
Using the ServiceTest Guide in Table 8, p. 38, momentarily
jump across theTest 1 &Test 2 terminals on LTB1 one time
to start the Minimum VentilationTest.
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 (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 theTest 1 &Test 2 terminals
on LTB1 one additional time if continuing from
previous component start-up or until the desired start-
up componentTest is started.
4. Verify that the dampers stroked to the full open
position.
5. To stop the SERVICETEST, turn the main power
disconnect switch to the “Off” position or proceed to
the next component start-up procedure.
Compressor Start-Up
Using the ServiceTest Guide in Table 8, p. 38, 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 theTest 1 &Test 2 terminals
on LTB one additional time if continuing from previous
component start-up or until the desired start-up
componentTest 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 compressorTerminal 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 ±5ºF of the superheat chart
value.
5. Repeat Step 1 through Step 4 for each refrigerant
circuit.
6. To stop the SERVICETEST, turn the main power
disconnect switch to the “Off” position or proceed to
the next component start-up procedure.
Heating Start-Up
Using the ServiceTest Guide in Table 8, p. 38, continue the
SERVICE TEST start-up procedure for each compressor
circuit.
1. Clamp an amp meter around one of 1
st
stage heater
power wires at the heater contactor.
2. Momentarily jump across theTest 1 &Test 2 terminals
on LTB one additional time if continuing from previous
component start-up or until the desired start-up
componentTest is started.
3. Verify that the heater stage is operating properly.
4. Clamp an amp meter around one of 2
nd
stage heater
power wires at the heater contactor (if applicable).
5. Momentarily jump across theTest 1 &Test 2 terminals
on LTB one additional time if continuing from previous
component start-up or until the desired start-up
componentTest is started.
6. Verify that the heater stage is operating properly.
7. To stop the SERVICETEST, turn the main power
disconnect switch to the “Off” position or proceed to
the next component start-up procedure.
WARNING
Rotating Components!
During installation, testing, servicing and
troubleshooting of this product it may be necessary to
work with live and exposed rotating components. Have
a qualified or licensed service individual who has been
properly trained in handling exposed rotating
components, perform these tasks. Failure to follow all
safety precautions could result in rotating components
cutting and slashing technician which could result in
death or serious injury.
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