Carrier 48GH - Manual (Page 2)

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SAFETY CONSIDERATIONS
Installation, start-up and servicing of this equip­
ment can be hazardous due to system pressures,
electrical components and equipment location
(roofs, elevated structures, etc.).
Only trained, qualified installers and service
mechanics should install, start-up and service this
equipment.
Consult the Owner’s Manual for routine main­
tenance. All other operations should be performed
by trained service personnel.
When working on the equipment, observe pre­
cautions in the literature, tags, stickers and labels
attached to the equipment and any other safety
precautions that apply.
• Follow all safety codes.
• Wear safety glasses and work gloves.
• Use care in handling, rigging and setting bulky
equipment.
WARNING; Do Hot discosaect electric power
to this appliance wiiliout Htst mrnirfg oft the gas
supply. Be sure power to ©quipmeot is shut off
before perforuiiug maintenance (»r service.
INTRODUCTION
Models 48GH/GL Packaged Gas/Electric Units
are fully self-contained, combination gas-heating/
electric-cooling units designed for outdoor installa­
tion either on a rooftop or ground-level slab. See
Fig. 1.
These units are equipped with an energy-saving
automatic intermittent electric spark ignition system
that does not have a continuously-burning pilot.
Also included is the Time Guard II circuit for added
compressor protection. All units are manufactured
with natural gas controls.
Models 48GH/GL are AG A design-certified with
2 input ratings. See Table 1. All units are manu­
factured for operation at the minimum rating. For
operation at the maximum ratings, optional burner
orifices must be field installed. See Table 3.
These units are factory charged with R-22 refrig­
erant. To install: connect gas supply, air ducts, high-
and low-voltage wiring, condensate drain, and
install a field-supplied air filter in the return-air
ductwork.
All units can be connected into existing duct
systems that are properly sized and designed to
handle an airflow of 350 to 450 cfm per each 12,000
Btuh of rated cooling capacity. See Tables 1 and 4
for cooling and heating airflow requirements.
NOTE: When installing any accessory item, see
Installation Instructions packaged with the
accessory.
IMPORTANT —
READ BEFORE INSTALLING
L This insiaUation must conform with all
applicable local and national codes.
2. Power .supply (volts, hertz and phase) must
correspond to that specified on unit rating
plate.
3- Elecíríeal supply provided by utility mast be
sufikient to handle load imposed by this unit.
4. Refer to the 4SGH / GL dimensionai drawing
for locations of gas inlet, elearical inlets,
condensate drain, duct connections, and
required clearances before setting unit in
place.
5. Locate the nnit where the vent cap will be a
minimum of 4 ft from openable windows or
doors.
6. This installation must conform with local
building codes and with the National Fuel
Gas code ANSÍ Z223.1-1980.
GENERAL
Models 48GH/GL Packaged Gas/Electric Units
have been designed and tested in accordance with
ANSI Z21.47-1978, ARI Standard 210-79 and ARI
Standard 270-75. The appliance design is certified
by the American Gas Association (AGA) for use
with natural or LP (propane) gases with appropriate
components and orifices.
INSTALLATION
Step 1 — Rig and Place Unit
CAUTION: W'hen rigging unit to be lifted, use
spreader bars to protect top and sides. Models
4^GH/GL must he rigged for lifting as shown
in Fig, 2. Use extreme caution to prevent
damage when moving unit.
SPREADER BARS:
(2)2x4xUNIT LENGTH PLUS IO"WITH
if DEEP 90° NOTCHES EACH END
(2) 2x4xUNIT WIDTH WITH 1^’
DEEP 90° NOTCHES
EACH END
USE SPREADER BARS
TO PROTECT UNIT
CHAIN
PACKAGED UNIT-
LOCATE CHAINS THRU
HOLES IN BASE
CHANNELS TWO OR THREE BASE
CHANNELS ATTACHED TO
BOTTOM OF UNIT
Fig. 2 — 48GH/GL Suggested Rigging
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