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To avoid possible explosion, th line from the nitrogen
cylinder must include a pressure regulator and a pressure
relief valve. The pressure relief valve must be set to open
at no more than 150 PSIG.
Pressure test the system using dry nitrogen and soapy
water to locate leaks. If you wish to use a leak detector,
charge the system to 10 psi using the appropriate
refrigerant then use nitrogen to finish charging the system
to working pressure then apply the detector to suspect
areas. If leaks are found, repair them. After repair, repeat
the pressure test. If no leaks exist, proceed to system
evacuation.
System Evacuation
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.
REFRIGERANT UNDER PRESSURE!
Failure to follow proper procedures may cause property
damage, personal injury or death.
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.
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
0
1
2
• 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
WARNING
WARNING
LEAK(S)
PRESENT
CONDENSIBLES OR SMALL
LEAK PRESENT
NO LEAKS
NO CONDENSIBLES
3
4
5
6
7
8
9
10
MINUTES
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.
Refer to the Remote Condensing Unit Service Manual
for more detailed instructions on system evacuation,
preliminary charge adjustment, and final charge
adjustment.
Electrical Connections
HIGH VOLTAGE!
Disconnect ALL power sources.
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.
To avoid risk of fire or equipment damage, use copper
conductors.
Notice: Units with reciprocating compressors and non-
bleed TXV's require a Hard Start Kit.
This unit is designed for three phase operation. DO NOT
OPERATE ON A SINGLE PHASE POWER SUPPLY.
Measure the power supply to the unit. The supply voltage
must be in agreement with the unit rating plate power
requirements.
Rated
Voltage
Supply Voltage
208 / 230V
460V
The condensing unit rating plate lists pertinent electrical
data necessary for proper electrical service and
overcurrent protection. 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. The wire size must be sufficient to carry the
Minimum Circuit Ampacity (MCA) listed on the serial plate.
The supply voltage can be unbalanced (phase to phase)
within 2%. The following formula can be used to determine
the percentage of voltage unbalance for your unit.
5
WARNING
WARNING
Minimum
Maximum
Supply Voltage
197
253
414
506
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