Carrier 28GH - Manual (Page 2)

COIL 006 must have the liquid and suction lines
soldered to the unit.
Refrigerant Control is a factory-installed thermal
expansion valve. For proper operation, locate the
feeler bulb outside the encased coil about 45
degrees above the horizontal center line of the
suction line.
Do not mount bulb such that capillary tube
extends from bottom of bulb. Clean suction line
for good contact with bulb. Secure bulb tightly to
suction Une with metal straps provided. If this is
not done, liquid may slug to the compressor.
Suction Line Insulation — Insulate entire suction
line. Tubing package has an insulated suction line.
Insulate suction line from encased coil to, and
surrounding, expansion valve feeler bulb on 28GH
Coils.
Refrigerant Charge — Coils 002 thru 005 have
vapor holding charge. Do not evacuate if accessory
tubing package with Carrier Compatible Fittings is
used. If sweat connections are used, purge or
evacuate coil and piping.
Coil 006 is shipped without charge. Purge or
evacuate coil and piping.
Refer to Standard Service Techniques Manual,
Chapter 1, pages 1-8 thru 1-14, and condensing
unit and/or tubing package instructions for details.
Condensate Drain
1. Connect the rubber elbow (furnished with unit)
to the primary drain. See Fig. 1.
2. Connect 7/8-in. copper tube to the elbow.
3. Form a trap in the 7/8-in. copper tube and run
the tubing to an open drain. Drain tube should
be pitched at least 1 in. per 10 ft.
4. Run individual condensate lines to the primary
and secondary drain pans. The condensate line
should discharge at a point where it can be
readily observed if a correction is needed.
HOW TO APPLY HOSE CLAMPS
1. Pull ends apart (Fig. 3).
2. Wrap around hose with toothed end beneath.
Prelatch by compressing until last ratchet teeth
catch behind small tabs.
LOCKiNG
COIL 28GH 002 003 004 005
Horizontal 975 1200 1580 1920
CLAMP IN LOCKING POSiTiON
Fig. 3 — Hose Clamp
3. Grip adjacent bridges with pliers and compress
to tight position. Pliers can be held parallel to
hose where space is limited.
4. To remove, lift the locking tongue with
screwdriver.
Protective Plastic Film — Peel from unit panels
when installation is complete.
AIR QUANTITY
To prevent moisture blowoff do not exceed
cfm shown in Table 1.
Table 1 — Maximum Allowable CFM for 28GH Coil
006
2560
Manufacturer reserves the right to change any product specifications without notice.
C A R R I E R A I R C O N D I T I O N I N G C O M P A N Y • S Y R A C U S E , N E W Y O R K
Tab 7 Form28GH-1SI New Printed in U.S.A. 6-69 Codes D and MS Catalog No. 532-841