114
RT-SVX072A-EN
NNOOTTIICCEE
CCoommpprreessssoorr DDaammaaggee!!
EExxcceessssiivvee lliiqquuiidd aaccccuummuullaattiioonn iinn tthhee ssuuccttiioonn lliinneess
ccoouulldd rreessuulltt iinn ccoommpprreessssoorr ddaammaaggee..
DDoo nnoott aallllooww lliiqquuiidd rreeffrriiggeerraanntt ttoo eenntteerr tthhee ssuuccttiioonn
lliinnee..
IImmppoorrttaanntt:: 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.
IImmppoorrttaanntt:: 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 Figure
97, p. 116 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 ENTER key to
confirm this choice.
WWAARRNNIINNGG
RRoottaattiinngg CCoommppoonneennttss!!
FFaaiilluurree ttoo ddiissccoonnnneecctt ppoowweerr bbeeffoorree sseerrvviicciinngg ccoouulldd
rreessuulltt iinn rroottaattiinngg ccoommppoonneennttss ccuuttttiinngg aanndd ssllaasshhiinngg
tteecchhnniicciiaann wwhhiicchh ccoouulldd rreessuulltt iinn ddeeaatthh oorr sseerriioouuss
iinnjjuurryy..
DDuurriinngg iinnssttaallllaattiioonn,, tteessttiinngg,, sseerrvviicciinngg aanndd
ttrroouubblleesshhoooottiinngg ooff tthhiiss pprroodduucctt iitt mmaayy bbee
nneecceessssaarryy ttoo wwoorrkk wwiitthh lliivvee aanndd eexxppoosseedd rroottaattiinngg
ccoommppoonneennttss.. HHaavvee aa qquuaalliiffiieedd oorr lliicceennsseedd sseerrvviiccee
iinnddiivviidduuaall wwhhoo hhaass bbeeeenn pprrooppeerrllyy ttrraaiinneedd iinn
hhaannddlliinngg eexxppoosseedd rroottaattiinngg ccoommppoonneennttss,, ppeerrffoorrmm
tthheessee ttaasskkss..
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 Figure
97, p. 116 for the various compressor locations.
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 “,” to program the following system
components for the number 1 refrigeration circuit
by scrolling through the displays;
UUnniitt SSttaarrttuupp
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