Carrier 30HH - Manual (Page 48)

30HH,HJ
MAINTENANCE
Carrier
SYMPTOMS j CAUSE REMEDY
I. Frosted liquid line
1
Receiver shut-off valve
j partially closed or
restricted
1
Open valve or remove restriction
j
Restricted catchall Replace
COMPRESSOR MAINTENANCE
The 30HH and H] Liquid Chillers use the Carrier
6D hermetic compressors . For detailed compres-
sor operation and maintenance instructions, consult
the 6D-Product Information Service Manual
CAUSE AND PREVENTION OF FREEZE-UP
CAUSE PREVENTION
Improper charging. Make sure that a full quantity of water is flowing
through the cooler while charging.
Make sure the suction pressure in the cooler is
equal to or greater than that corresponding to 32 F
(58 psi for Refrigerant-22).
Improperly set safety thermostat Check the safety thermostat for proper setting at
the beginning of each season.
Operating with safety thermostat bypassed. The safety thermostat is wired in series with the
compressor motor starter. Do not bypass it.
Improper chilled water circulation. Use an ample sized cleanable strainer in the chilled
water circuit. Make certain the strainer is clean
to Insure full flow and velocity of chilled water. It
may sometimes be necessary to treat the water to
prevent formation of deposits .
Not draining for winter shutdown. When the system is shut down for the winter, re­
move the drain plugs and drain the cooler. Blow
out any remaining water with air.
NOTES: 1. If the ambient temiperature is below 32 F, freezing can be prevented by one of two methods:
a. Drain all water from the equipment.
b. Add antifreeze to the water.
A safe antifreeze that meets code and Underwriter requirements may be circulated with the residual
water in the system. The antifreeze may be drained and re-used until it is diluted to the minimum
safe limit.
2. Damage to chiller due to freezing is considered abuse and is not covered by the warranty.
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