APC AFX Series Specifications download pdf (Page 13)

Charging the System

The AFX Series Water/Glycol and the integral

mounted Air-cooled systems are factory charged

with refrigerant. All other direct expansion

systems must have the piping evacuated and

the system charged.

All refrigerant connections should be leak tested

before the system is charged with refrigerant.

The complete system should be pressured to

400 psig with refrigerant and dry nitrogen. Use

an electronic leak detector to carefully check

each joint. Leaks should be repaired and the

system pressurized again to 400 psig to double

check all joints.

After the leak check has been performed, a

vacuum pump should be used to evacuate the

total system (the unit, condenser and inter-

connecting piping) after the condenser has been

installed in the system. Put vacuum on the total

system of 29 inches or 50 microhms and hold it

for four hours. Then break the vacuum with dry

refrigerant. At this point the system can be fully

charged.

Follow standard HVAC charging practices but

use the following recommendations: when the

system is properly charged, the superheat

should be nominally 15

F and the subcooling

System Function

After connecting all the utilities to the unit and

ensuring that the unit is securely mounted in

place, start the air conditioner by enabling the

ON/OFF switch on the thermostat in the ON

position. This will start the evaporator blower.

Turn the thermostat to the lowest setting and the

compressor will start. After the refrigeration

system has functioned for approximately 15

minutes, observe the suction and discharge

pressure gauges and inspect

the sight glass. The system should be fully

charged (sight glass clear). The gauges should

indicate between 58-75 psig suction pressure

and approximately 225-275 psig discharge

pressure. If the unit is functioning properly, the

controls may be set at the desired setting and

the return air grille closed.

Complete the start-up sheet and return it to

APC.

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APC AFX Series Specifications Page 13

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