Carrier 28QX User Manual

Page 27

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leaving water header in approximately 60-

second intervals. Using this method will
remove most of water in coil circuits.

See fan section, electric heater, or the

compressor section Installation, Start-Up
and Service Instructions for scheduled
maintenance.

STORAGE TANK

e. As specified in the Start-Up Instructions, an

inhibitor must be added to the water in the
storage tank to prevent corrosion. Since this
is an open system, it is very important that
the effectiveness of the inhibitor is main
t a i n e d .

(See

Inhibitor

Manufacturer’s

Instructions).

2. Outdoor components

The 38HQ940/960 coil should be cleaned
annually or as often as required.

REFRIGERANT CHARGING - The 38HQ out

door fan coil unit contains correct operating charge
for complete system. Refer to 38HQ Unit Installa
tion, Start-Up and Service booklet for refrigerant
charging method details. Cooling cycle charging
charts and heating cycle operation check charts for
38HQ/28QX systems are included in this booklet.
Fig. 31 thru 36.

CAUTION: Rapid, removal of Refrigeran.t-22
charge from heat pump system can <3ro;p pre.s-
sure and lower temperature and can cause water
in tire Tri~X coil to freeze and split coil tubes.
When necessary for servicing, remove ciiarge
very slowly to minimize possibility of freeze
dajnage.

PRESSURE AT SUCTION SCHRADER VALVE-PSIG

SUCTION PRESSURE AT SCHRADER VALVE-PSIG

Fig. 31 - 38HQ127/38HQ940 with 28QX036

Cooling Cycle Charging Chart

Fig. 32 - 38HQ127/38HQ940 with 28QX940

Heating Cycle Operation Check Chart