Charge with refrigerant, Vapor charging method, 30hh,hj – Carrier 30HH User Manual
Page 20: Installation
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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.
20