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2. Evacuatethesystemto250micronsorlessusingsuc-
tionandliquidservicevalves.Usingbothvalvesisnec-
essaryassomecompressorscreateamechanicalseal
separatingthesidesofthesystem.
3. Closepumpvalveandholdvacuumfor10minutes.Typi-
callypressurewillriseduringthisperiod.
5O00
4500
4000
O 3500
_z 3000
i 2500
_> 2000
1500 CONDENSIBLES OR SMALL
LEAK PRESENT
1000
500 NO LEAKS
0 1 2 3 4 5 6 7 8 9 10
MINUTES
• If the pressure rises to 1000 microns or less and remains
steady the system is considered leak-free; proceed to
startup.
• If pressure rises above 1000 microns but holds steady
below 2000 microns, moisture and/or noncondensibles
may be present or the system may have a small leak.
Return to step 2: If the same result is encountered check
for leaks as previously indicated and repair as necessary
then repeat evacuation.
• If pressure rises above 2000 microns, a leak is present.
Check for leaks as previously indicated and repair as nec-
essary then repeat evacuation.
Electrical Connections
kWARNING
HIGH VOLTAGE!
Disconnect ALL power before servicing.
Multiple power sources may be present.
Failure to do so may cause property damage,
personal injury or death due to electric shock.
Wiring must conform with NEC or CEC and all
local codes. Undersized wires could cause
poor equipment performance, equipment damage
or fire.
tion. Wires should be sized to limit voltage drop to 2% (max.)
from the main breaker or fuse panel to the condensing unit.
Consult the NEC, CEC, and all local codes to determine the
correct wire gauge and length.
Local codes often require a disconnect switch located near the
unit; do not install the switch on the unit. Refer to the installa-
tion instructions supplied with the indoor furnace/air handler for
specific wiring connections and indoor unit configuration. Like-
wise, consult the instructions packaged with the thermostat
for mounting and location information.
Overcurrent Protection
The following overcurrent protection devices are approved for
use.
• Time delay fuses
• HACR type circuit breakers
These devices have sufficient time delay to permit the motor-
compressor to start and accelerate its load,
Three Phase Compressor Rotation
CAUTION
Use care when handling scroll compressors. Dome temp-
eratures could be hot.
Three phase compressors are power phase dependent and
can rotate in either direction.
Verify proper rotation for three phase compressors byensuring
the suction pressure drops and discharge pressure rises when
the compressor is energized. NOTE: When operated in re-
verse, a three phase scroll compressors is noisier and its cur-
rent draw substantially reduced compared to marked values.
To correct, disconnect power and switch any two leads at the
unit contactor and re-observe.
High Voltage Connections
Route power supply and ground wires through the high voltage
port and terminate in accordance with the wiring diagram pro-
vided inside the control panel cover.
Low Voltage Connections
Condensing unit control wiring requires 24 Volt minimum, 25VA
service from the indoor transformer. Low voltage wiring for two-
stage units depends on the thermostat used and the number
of control wires between the indoor unit and the condensing
unit. Route control wires through the low voltage port and ter-
minate in accordance with the wiring diagram provided inside
the control panel cover.
WARNING
I
To avoid the risk of fire or equipment damage, use I
copper conductors. I
NOTICE 1
Units with reciprocating compressors and non-bleed TXV's
requ re a Hard Start Kt.
The condensing unit rating plate lists pertinent electrical data
necessary for proper electrical service and overcurrent protec-
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