DSZC16 Installation Manual
5
REFRIGERANT UNDER PRESSURE!
F
AILURE
TO
FOLLOW
PROPER
PROCEDURES
MAY
CAUSE
PROPERTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
.
WARNING
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
S
YSTEM
E
VACUATION
Condensing unit liquid and suction valves are closed to contain
the charge within the unit. The unit is shipped with the valve
stems closed and caps installed. Do not open valves until
the system is evacuated.
NOTE: Scroll compressors should never be used to evacuate or
pump down a heat pump or air conditioning system.
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.
E
LECTRICAL
C
ONNECTIONS
The condensing unit rating plate lists pertinent electrical data
necessary for proper electrical service and overcurrent protec-
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.
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 voltage port and terminate in accordance with the wiring diagram provided
inside the control panel cover.
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
ACUUM
IN
MICRONS
CONDENSIBLES OR SMALL
LEAK PRESENT
NO LEAKS
NO CONDENSIBLES
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