Carrier CDII-184R1-0CTR4 Installation & Operation Manual page 64

Compressor Motor resistance values
Motor resistance (20 °C)
11.3 REFRIGERANT SYSTEM MAINTENANCE
11.3.1 PRE-START UP
11.3.1.1 PRE-PRESSURE TEST
Step 1: Carry out a pressure test of unit at 350 PSIG by using dry nitrogen through liquid service valve
port of service valve ensuring that suction and liquid valve are fully closed. Pressure testing should be
done using two-stage regulator. However, in case of leaks in refrigerant circuit or breaking of joints etc.,
valves must be back seated and entire system of indoor and outdoor units with piping has to be pressure
tested, evacuated and charged.
Warning: - Don't use Port 'A' of suction service valve for pressure testing and evacuation. Incorrect use
will cause mixing of refrigerant & nitrogen and evacuation of condensing unit.
Suction Service Valve and replacing shredder pin.
Step 2: When suction valve is in closed position. Path between interconnecting piping and compressor
side is close but Port 'A' is in always open position to condensing unit. Charging nitrogen from port 'A'
and vacuuming is strictly restricted doing this.
• Operation tends mix nitrogen with refrigerant never do any operation from Port 'A' except gas top up
(when compressor, fan and indoor unit is operational).
• Port 'A' is always open until spindle is fully open (100%) when spindle is fully condition the port "A" is
closed for replacing the shredder pin (this is for Shredder valve service purpose).
Step 3: After pressurizing, indoor and interconnecting piping check pressure at liquid valve gauge port
pressure in liquid valve gauge port will be 300 PSIG but pressure in suction valve gauge port will be
around 150 PSIG because it shows the system refrigerant pressure i.e 150 PSIG.
Step 4: However, in case of leaks in refrigerant circuit or breaking of joints etc., valves have to be back
seated and entire system of indoor and outdoor units with piping has to be pressure tested, evacuated
and charged refrigerant from liquid valve.
After pressurizing system, do following:
11.3.1.2 SOAP TEST
Apply soap solution at all flare connections and brazing point. If bubbles appear at some points, then
tighten flare nut or braze leaking points (after releasing gas from system). No bubbles should finally
appear.
11.3.1.3 PRESSURE DECAY TEST
After soap test, note pressure at liquid leave system pressurized for 60 minutes note pressure again.
There should be no pressure decay, recheck for leaks, remove them and do pressure decay test again.
TNB306FPNMT
ANB52FKRMT
ANB66FVAMT
64
1.02 Ω (+/- 10 %)
0.30 Ω (+/- 10 %)
0.23 Ω (+/- 10 %)