Leak Test And Dehydration; Refrigerant Charging; Oil Charge - Carrier 30HS Series Installation, Start-Up And Service Instructions Manual

6. Fill chilled water circuit with clean water or
other noncorrosive fluids to be cooled. Bleed
all air out of high points of system. Set flow
rate per job requirements.
7. Set temperature controller (see Capacity
Control).
8. Check tightness of all electrical connections.
9. Compressor oil should be visible in bull'g-eye.
10. Be sure there are no refrigerant leaks (see Leak
Test and Dehydration).
11. Be sure compressor contains oil (see Oil
Charge.
12. Crankcase heater must be firmly 'ocked into
compressor crankcase and energized for 24
hours.
13. Check compressor suspension.
The mounting
rail lock bolts must be removed. Be sure com-
pressor hold-down bolts are tight.
LEAK TEST AND DEHYDRATION
For proper procedure, refer to Carrier Stand-
ard Service Techniques Manual, Chapter 1,
Refrigerants.
All 30HR Units
are fully charged with R-22 at
factory (see Table 1). A leak test should be per-
formed at time of installation to assure that leaks
have not developed during shipment. Dehydration
is not necessary unless complete refrigerant charge
has been lost.
All 30HS Units
are shipped with R-22 holding
charge only. Complete system, including factory
and field piping, should be leak tested and dehy-
drated at time of installation.
REFRIGERANT CHARGING
Complete operating charge for remote condenser
and interconnecting piping used with 30HS units
must be field supplied.
Do not open condenser liquid valves or com-
pressor discharge valves until the charge (positive
pressure) is found in remainder of system. Check
liquid line sight glasses when unit is started to be
sure unit is fully charged.
The liquid charging method is recommended for
complete charging or .when additional charge is
required.
CAUTION:
ION: When charging, circulate water
thru condenser and cooler at all times to prevent
freezing. Freezing damage is considered abuse
and is not covered by Carrier Warranty.
Be careful not to overcharge system. Over-
charging results in higher discharge pressure
with higher cooling water consumption, pos-
sible compressor damage and higher power
consumption
Liquid Charging Method
—
Charge thru filter-
drier liquid line charging valve. Never charge liquid
into the low pressure side of system.
1. Frontseat (close) condenser liquid line shutoff
valve.
2. Connect a refrigerant cylinder loosely to charg-
ing valve connection of filter-drier. Purge
charging line and tighten connections.
3. Open filter-drier liquid line charging valve.
4. If system has been dehydrated and is under
vacuum, break vacuum with refrigerant (gas
charge). Build up system pressure to 58 psi for
R-22 (32 F). Invert refrigerant cylinder so that
liquid refrigerant will be charged.
5. a. For complete charge see Charging in Carrier
Standard Service Techniques Manual,
Chapter 1, Refrigerants. Follow Charging
By Weight procedure. (When charge is nearly
full, complete process by
observing
sight
glass for clear liquid flow.)
b. For complete charge where refrigerant cyl-
inder cannot be weighed or for adding refrig-
erant, follow the procedure Charging By Sight
Glass in the manual.
6. To ensure maximum subcooler performance,
check liquid level in condenser by means of test
cock located on the condenser shell near right
end tube sheet. Liquid discharge from test cock
indicates fully charged subcooler.
START
-
UP
_ _
---- —
CAUTION: Start-up should be performed only
under supervision of experienced refrigeration
mechanic.
1. Be sure all compressors are warm (crankcase
heaters should be energized for 24 hours before
start-up).
2. Open all system valves that may have been
closed during or after charging.
3. Check air-handling equipment, chilled water and
condenser water pumps, and any other equip-
ment connected to chiller.
4. Start unit.
5. Check all controls for proper operation. (Follow
check procedures given in these instructions.)
6. Adjust water-regulating valve to most econom-
ical head pressure (based on relative cost of
water and electricity). Head pressure is normally
200 to 230 psi for R-22.
7. Check chilled water leaving temperature to see
that it remains well above freezing.
8. Check amount of compressor oil. Add or remove
oil to achieve required level during steady oper-
ation (see Oil Charge).
OIL CHARGE
All units are factory charged with oil (see
Table 1).
Observe oil level closely at start-up. If oil level is
below- bull's-eye and cannot be seen, add oil until
level is approximately 1/ 4 bull's-eye.
If oil is visible in bull's-eye, do not add oil until
after several hours of operation; then, if oil level is
not between 1/ 4 and 1/ 3 bull's-eye, add enough to
attain this level. To add or remove oil, see Carrier
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