Carrier 30HH - Manual (Page 20)

30HH,HJ
INSTALLATION
TYPE LIQUID SHUT-OFF VALVE CHARGE
USING VAPOR METHOD
Fig. 26 - 30HH Condenser Liquid Line Shut-Off Valves
5. Check chiller leaving temperature to see
that it remains well above freezing.
6. Check compressor oil level ("Oil Charge”).
CHARGE WITH REFRIGERANT
Each system in the 30HH and HJ units must be
charged individually.
IMPORTANT: 30HH015,020 units are
fully charged at factory.
Charge early models of the 30HH015 to 030 units
using the vapor charging method.
Charge later models of the 30HH units using
liquid charging method. A redesign of the con­
denser
liquid shut-off valve makes it possible
to charge liquid refrigerant thru the gage port
directly into the chiller, when the valve is in the
front
seated position. Check Fig. 26 showing
both valves to determine the method of charging
to be used.
CAUTION: When charging the units,
circulate water thru the condenser
(30HH) and chiller (30HH and HJ) at all
times to prevent freezing. Freezing of
equipment
with resulting damage is
considered abuse and not covered by
the Carrier Warranty.
Vapor Charging Method
Vapor charge the units thru compressor suction
shut-off valves as follows:
1. Backseat the suction shut-off valve.
2. Connect a refrigerant cylinder loosely to the
gage connection of the suction shut-off valve.
The charging line should contain a drier.
3. Purge the charging line and tighten the con­
nections.
4. Turn the stem of the suction shut-off valve
clockwise a couple of turns.
5. Stand the cylinder upright so that only gas is
charged into the system. Crack valve on the
charging cylinder and break vacuum (30HJ
units) with refrigerant vapor. Open the valve
of the charging cylinder and start the com­
pressor.
(See ”Start-Up Procedures.”) Al­
low the compressor to cycle on the low-
pressure cut-out until the refrigerant charge
builds up sufficiently to permit continuous
compressor operation.
As the cylinder is discharged, its pressure
will eventually drop to the same level as suc­
tion
pressure. The remaining refrigerant can
be drawn from the cylinder by front seating
the suction shut-off valve and pulling a vac­
uum on the cylinder.
6. Check the refrigerant charge frequently at
the moisture liquid-indicator. A steady flow
of liquid refrigerant will indicate a sufficient
charge.
7. When the unit is sufficiently charged, close
the cylinder valve, backseat the suction shut­
off valve, and remove the charging apparatus.
Replace the plug in the suction shut-off valve.
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