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Important: COMPRESSOR SERVICE VALVES MUST BE
FULLY OPENED BEFORE STARTUP
(SUCTION, DISCHARGE, AND OIL LINE).
3. Close the disconnect switch or circuit protector switch
that provides the supply power to the unit terminal block
(2XD1 on 20-75T units / 1XD1 on 90-130T units) or the
unit mounted disconnect switch (2QB1 on 20-75T units
/ 1QB1 on 90-130T units).
4. Turn the 115 volt control circuit switch (1S1) to the "On"
position.
Turn the 115 volt control circuit switch (1S20) to the
"On" position. (90-130T units only)
5. Allow compressor crankcase heaters to operate for a
minimum of 8 hours before continuing.
Important: Compressor Damage could occur if the
crankcase heater is not allowed to operate
the minimum of 8 hours before starting the
compressor(s).
6. Open the access door located in the unit control panel,
and press Manual Overrides to display the first service
screen. Refer to the latest edition of the applications
programming guide (RT-SVP07*-EN) for applications
for the Manual Overrides screens and programming
instructions.
7. Use tables in
","
to program the following system
components for operation by scrolling through the
displays:
20–30 Ton
•
Compressor 1A (On)
•
Compressor 1B (Off)
•
Condenser Fans
40-75 ton (VSC units only)
•
Compressor 1A (On)
•
Compressor 2A (Off)
•
Compressor 2B (Off)
•
Condenser Fans
40-130 ton
•
Compressor 1A (On)
•
Compressor 1B (Off)
•
Compressor 2A (Off)
•
Compressor 2B (Off)
•
Condenser Fans
8. Attach a set of service gauges onto the suction and
discharge gauge ports for each circuit. See
100, p. 113
for the various compressor locations.
9. Once the configuration for the components is complete,
press the NEXT key until the LCD displays the "Start
test in __Sec." screen. Press the + key to designate the
delay before the test is to start. This service test will
begin after the TEST START key is pressed and the
delay designated in this step has elapsed. Press the
RT-SVX072D-EN
ENTER key to confirm this choice.
Rotating Components!
Failure to disconnect power before servicing could
result in rotating components cutting and slashing
technician which could result in death or serious
injury.
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.
10. Press the Auto key to start the test. Remember that the
delay designated in step 8 must elapse before the
system will begin to operate.
11. Review and follow the Electrical Phasing procedure
described in the startup procedure of the IOM. If the
compressors are allowed to run backward for even a
very short period of time, internal compressor damage
may occur and compressor life may be reduced. If a
scroll compressor is rotating backwards, it will not
pump, make a loud rattling sound and low side shell
gets hot. Immediately shut off the unit. If the phasing is
incorrect, interchange any two compressor leads to
correct the motor phasing.
12. Press the STOP key and clear all Manual Overrides in
the unit control panel to stop the compressor operation.
13. Repeat steps 5–11 for each compressor stage and the
appropriate condenser fans.
Refrigerant Charging
1. Attach a set of service gauges onto the suction and
discharge gauge ports for each circuit. See
100, p. 113
2. Open the access door, located in the unit control panel,
and press the Manual Overrides key to display the first
service screen. Refer to the latest edition of the
applications programming guide for VAV applications
for the Manual Overrides screens and programming
instructions.
3. Use tables in
components for the number 1 refrigeration circuit by
scrolling through the displays;
OCC/UNOCC Relay (Unoccupied for VAV units)
All Compressors for each circuit (On)
Figure
Condenser Fans for each circuit (On)
WARNING
for the various compressor locations.
","
to program the following system
Unit Start-up
Figure
111
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