5
REFRIGERANT
UNDER
PRESSURE!
F
AILURE
TO
FOLLOW
PROPER
PROCEDURES
MAY
CAUSE
PROPERTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
.
WARNING
NOTE:
Scroll compressors should never be used to evacuate
or pump down a heat pump or air conditioning system.
P
ROLONGED
OPERATION
AT
SUCTION
PRESSURES
LESS
THAN
20
PSIG
FOR
MORE
THAN
5
SECONDS
WILL
RESULT
IN
OVERHEATING
OF
THE
SCROLLS
AND
PERMANENT
DAMAGE
TO
THE
SCROLL
TIPS
,
DRIVE
BEARINGS
AND
INTERNAL
SEAL
.
CAUTION
1. Connect the vacuum pump with 250 micron capability
to the service valves.
2. Evacuate the system to 250 microns or less using
suction
and
liquid service valves. Using both valves is
necessary as some compressors create a mechanical
seal separating the sides of the system.
3. Close pump valve and hold vacuum for 10 minutes.
Typically pressure will rise during this period.
•
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
necessary then repeat evacuation.
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
0 1 2 3 4 5 6 7 8 9
10
LEAK(S)
PRESENT
MINUTES
V
ACU
U
M
IN
MI
CR
O
N
S
CONDENSIBLES OR SMALL
LEAK PRESENT
NO LEAKS
NO CONDENSIBLES
E
LECTRICAL
C
ONNECTIONS
HIGH
VOLTAGE!
D
ISCONNECT
ALL
POWER
BEFORE
SERVICING
.
M
ULTIPLE
POWER
SOURCES
MAY
BE
PRESENT
.
F
AILURE
TO
DO
SO
MAY
CAUSE
PROPERTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
DUE
TO
ELECTRIC
SHOCK
.
W
IRING
MUST
CONFORM
WITH
NEC
OR
CEC
AND
ALL
LOCAL
CODES
.
U
NDERSIZED
WIRES
COULD
CAUSE
POOR
EQUIPMENT
PERFORMANCE
,
EQUIPMENT
DAMAGE
OR
FIRE
.
WARNING
T
O
AVOID
THE
RISK
OF
FIRE
OR
EQUIPMENT
DAMAGE
,
USE
COPPER
CONDUCTORS
.
WARNING
The condensing unit rating plate lists pertinent electrical data
necessary for proper electrical service and overcurrent pro-
tection. Wires should be sized to limit voltage drop to 2%
(max.) from the main breaker or fuse panel to the condens-
ing unit. Consult the NEC, CEC, and all local codes to deter-
mine 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
installation instructions supplied with the indoor furnace/air
handler for specific wiring connections and indoor unit con-
figuration. Likewise, consult the instructions packaged with
the thermostat for mounting and location information.
O
VERCURRENT
P
ROTECTION
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.
H
IGH
V
OLTAGE
C
ONNECTIONS
Route power supply and ground wires through the high volt-
age port and terminate in accordance with the wiring dia-
gram provided inside the control panel cover.
L
OW
V
OLTAGE
C
ONNECTIONS
Condensing unit control wiring requires a nominal 24 VAC (+/-
6 VAC), 60 Hz, minimum 25 VA service from either the indoor
or outdoor transformer packaged with the optional communi-
cating thermostat kit. Low voltage wiring for the condensing
units depends on the thermostat used. The unit is designed to
work as part of a fully communicating HVAC system utilizing
the ComfortNet™, CTK0*AA thermostat, ComfortNet™ com-
patible indoor unit, and up to four wires.