Unit Start-Up
50
RT-SVX22M-EN
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.
ReliaTel™ Control.
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 component Test is started.
Electro Mechanical Control.
Using the Service Test
Guide perform the proper test mode connections.
3. Verify that the dampers stroked to the full open
position.
4. 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.
ReliaTel Control.
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 component Test is started.
Electro Mechanical Control.
Using the Service Test
Guide perform the proper test mode connections.
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.
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. Remove
electro mechanical test mode connections (if
applicable).
Dehumidification Option
Momentarily jump across theTest 1 andTest 2 terminals of
the LTB1 until the unit enters test mode 7. (See
Table 9,
p. 43
). Once the unit is in the reheat test mode, verify that
the 3 way valve has shifted to the reheat position and that
the supply temperature rises 10 ºF more than when in
cooling mode stage 2.
Monitor the suction pressure for 15 minutes. The suction
pressure should remain within 5 psi of normal cooling
operation. If the unit has a 2 speed outdoor fan and if the
outdoor air temperature is below 70°F, verify that the OD
fan is in low speed.
1.
Clamp an amp meter around one of 1st stage heater
power wires at the heater contactor.
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.
WARNING
Live Electrical Components!
During installation, testing, servicing and
troubleshooting of this product, it may be necessary to
work with live electrical components. Have a qualified
licensed electrician or other individual who has been
properly trained in handling live electrical components
perform these tasks. Failure to follow all electrical
safety precautions when exposed to live electrical
components could result in death or serious injury.
WARNING
Live Electrical Components!
During installation, testing, servicing and
troubleshooting of this product, it may be necessary to
work with live electrical components. Have a qualified
licensed electrician or other individual who has been
properly trained in handling live electrical components
perform these tasks. Failure to follow all electrical
safety precautions when exposed to live electrical
components could result in death or serious injury.
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