Carrier 48GH - Manual (Page 3)

Unit must remain in an upright position during all
rigging and moving operations. Unit must be level
for proper condensate drainage; therefore, ground-
level pad or field-supplied mounting curb must be
level before setting unit in place.
ROOFTOP INSTALLATION
CAUllONt When ìnstaHjjig «mt <m a rooftop,
be sure rooi wiU soppori. ibe additional weight.
Refer to Produot Data Digest to obtain total
weight and comer weight infonrnation.
When installing a Model 48GH/GL end-
discharge unit with a field-supplied downflow
plenum, a field-supplied roof-mounting curb must
be installed on and flashed into roof before unit
installation.
When installing a Model 48GH/GL end-
discharge unit without a downflow plenum, place
unit on a level base that provides proper support. On
flat roofs be sure that unit is located at least 4 in.
above highest expected water level on roof to pre­
vent flooding. Consult local codes for additional
installation requirements.
GROUND-LEVEL INSTALLATION - Place
unit on a solid, level concrete pad that is a minimum
of 4 in. thick and that extends approximately 2 in.
beyond casing on all 4 sides of unit. Do not secure
unit to pad except when required by local codes.
CLEARANCES — The required minimum oper­
ating and service clearances are shown in Fig. 1.
CAUTION: Douot resïîicî ccsdenser air^ow:.
An air restriction at either outdoor-air inlet (the
entire surface of the outdoor coil) or fan dis­
charge can he detfinaeniai to compressor hfe.
Condenser Ian discharges thru top of unit. En­
sure that fan discharge does not recirculate to
condenser coil. Do not locate unit in either a corner
or under a complete overhead obstruction. Mini­
mum clearance under a partial overhang (such as a
normal house roof overhang) is 3 ft above vent cap.
Do not locate unit where water, falling ice or snow
from an overhang or roof will damage or flood the
unit. Do not locate unit where grass, shrubs, or
other plants will interfere with airflow either into
or out of unit.
CONDENSATE DISPOSAE
NOTE. Ensure that condensate-water disposal
methods comply with local codes, restrictions and
practices.
Models 48GH/GL dispose of condensate water
thru a 3/4-in. MPT drain fitting. See Fig. 1 for
location.
Install a 3-in. trap at drain fitting to ensure
proper drainage. See Fig. 3. Make sure trap outlet
is at least 2 in. lower than unit drain pan connection
to prevent pan from overflowing. Prime trap with
water.
If the installation requires draining condensate
water away from the unit, connect a drain tube
using a minimum of 7/8-in. OD copper tubing.
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Table 1 — Installation
MODEL 48 GL018 GL024 GH024 GL030 GH030 GL036 GH036
SERIES 320 320 320 320/330 320/330 320/330 520/530 1 620/630 320/330 520/5
DIMENSIONS |ft-in.)
A 4-5-578 4-5-5/8
B 2-6-3/8 3-4-3/8
C 3-2- 1/8 3-5-1/8
D 1 -4 1 -7
E 1 -4 1-1 1/4
F 0-7- 1/4 * 0-8-7/8
G 0- 11 0-10
H 1-0-5/8 1-5-5/8
K 0-1- 3/32 0-1 3/8
FIELD-SUPPLIED FILTER
SIZE (sq. in.)*
Standard Disposable Type
289 396 396/433t 522 522 576 576 576 583/722f 583/72
Cleanable- or
High-Capacity Type
188 257 257/281t 339 339 374 374 374 379/469t 379/461
OPERATING WT (lb) 320 325 375 375 375 380 380 380 475 475
SHIPPING WT (lb) 330 335 385 385 385 390 390 390 485 485
HEATING INPUTS (Btuh)
Min 40,000 40,000 60,000 40,000 60,000 60,000 60,000 60,000 100,000 100,00
Max 50,000 50,000 75,000 50,000 75,000 75,000 75,000 75,000 1 25,000 125,00
COOLING AIRFLOW (Cfm) 600 825 825 1088 1088 ^ 1200 1200 1200 1215 1215
EXTERNAL STATIC
PRESSURE (in. wg)
0 10 0 10 0 10 0 15 0 15 0 15 0 15 0 15 0 15 0 15
^Recommended, field-supplied air filter areas shown are based on either cooling airflow at a velocity of 300 ft per
minute or heating airflow at a temperature of 60 F. depending on whichever value is larger Air filter pressure drop
should not exceed 0 08 in wg for unit to produce rated cooling performance
fWhen Models 48GH024 or GH036 are installed for operation at minimum rated heating input, recommended
minimum air filter area Is the smaller sq in figure shown for each type of filter Larger figures shown are mini-
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