Carrier 48HDT - Manual

Carrier Corporation • Syracuse, N Y 13221
Connbination Heating/Cooling Units
INDEX
P a g e
SAFETY CONSIDERATIONS.................................... 1
INSTALLATION .......................................................1-16
Step 1 — Provide Unit Support .............................. 1
• R O O F C U R B
• S L A B M O U N T
Step 2 — Field Fabricate Ductwork........................ 1
Step 3 — Rig and Place Unit.................................... I
• P O S I T I O N I N G
Step 4 — Install Flue Hood ..................................... 3
Step 5 — Trap Condensate Drain ........................... 3
Step 6 — Install Gas Piping..................................... 3
Step 7 — Make Electrical Connections.................. 3
• F I E L D P O W E R S U P P L Y
• F I E L D C O N T R O L W I R I N G
• H E A T A N T I C I P A T O R S E T T I N G S
Step 8 — Make Outdoor Air Inlet Adjust­
ments and Install Outdoor Air Hood..................... 10
• O P T I O N A L O U T D O O R A I R D A M P E R
• O P T I O N A L E C O N O M I Z E R
Step 9 — Adjust Evaporator Fan Speed........... 16
START-UP.............................................................. 16,17
SERVICE.................................................................
18-22
SAFETY CONSIDERATIONS
Installation and servicing of air conditioning
equipment can be hazardous due to system pressure
and electrical components. Only trained and quali­
fied service personnel should install, repair or
service air conditioning equipment.
Untrained personnel can perform basic mainte­
nance functions of cleaning coils and filters and
replacing filters. All other operations should be per­
formed by trained service personnel. When workiog
on air conditioning equipment, observe precautions
in the literature, tags and labels attached to the unit
and other safety precautions that may apply.
Follow all safety codes. Wear safety glasses and
work gloves. Use quenching cloth for unbrazing
operations. Have fire extinguishers available for
all brazing operations.
" W A R i i l N i J c Before g«:Tf<*rî3aîït^ service
EEteîïtî£eitî3ïiee «peîatîoîîs oa
power switch to ’tiott- Eted:ricaî cooïd
catîse
soçipiiçtl j^$ pî|îiï^ m above fjS
oiîit VâiYov^îaitôihe^&Èotsoected
fiotti Û,S
SfÊSS»!!
INSTALLATION
NOTE: 004,005,006 size units in California require
the installation of an accessory NOx baffle. Refer to
Accessory NOx Baffle Installation Instructions for
details.
Step 1 — Provide Unit Support
ROOF CURB (Downshot Units Only) — Assemble
and install accessory roof curb in accordance with
instructions shipped with curb. Curb details and
information required to field fabricate a roof curb
are shown in Fig. 1. Install insulation, cant strips,
roofing and flashing as shown.
Ductwork must he
attached to curb.
Oie^sfcehsig of the
roof cîïïh- is CFîîîcaJ ii>r wter i'aiegjtiij'. ïastaif
^pasîietîsîg ïoàtertaî. with the ccxif corb as
io L
Curb should be level. Unit leveling tolerance is
1/16 in. per linear foot in any direction. This is
necessary for unit drain to function properly. Refer
to Accessory Roof Curb Installation Instructions
for additional information as required.
SLAB MOUNT (Horizontal Units Only) — Provide
a level concrete slab that extends a minimum of 6 in.
beyond unit cabinet. The slab should be 8 in. thick
with 4 in. above grade. Install a gravel apron in front
of condenser air inlet to prevent grass and foliage
from obstructing airflow. Trap condensate drai.n.
Allow for trap when pouring slab.
Step 2 — Field Fabricate Ductwork — On
downshot units secure all ducts to roof curb and
building structure.
at ^ 45 m fern, A mk
ssaiïtîiihjî do$ü3Etg thè .gas. i?aìYe<$ìii,
Insulate and weatherproof all external duct­
work, joints and roof openings with flashing and
mastic in accordance with applicable codes.
Ducts passing through an unconditioned space
must be insulated and covered with a vapor barrier.
A minimum clearance is not required around
ductwork. Cabinet return air static shall not exceed
-.35in.wg with economizer or -.45in.wg without
economizer.
Step 3 — Rig and Place Unit — Inspect unit for
transportation damage. File any claim with trans­
portation agency. Keep upright and do not drop.
Carrier Corporation 1984 Form 48H.L-7SI