Carrier 48HDT - Manual (Page 3)

#
Spreader bars are not required if top crating is left
on unit. Rollers may be used to move unit across a
roof. Level by using unit frame as a reference,
leveling tolerance is ± l/16in. per linear foot in
any direction. See Fig. 2 for additional information.
Weight is shown in Table 1.
Lifting holes are provided in base rails as shown in
Fig. 2. Refer to rigging instructions on unit.
POSITIONING — Maintain clearance around and
above unit to provide minimum distance from com­
bustible materials, proper airflow and service access.
See Fig. 3 and 4.
Do not install unit in an indoor location. Do not
locate unit air inlets near exhaust vents or other
sources of contaminated air.
Although unit is weatherproof, guard against
water from higher level runoff and overhangs.
Locate mechanical draft system flue assembly at
least 48 in. from any opening through which com­
bustion products could enter the building, and at
least 48 in. from an adjacent building. When unit is
located adjacent to public walkways, flue assembly
must be at least 7 ft above grade.
After unit is in position, remove polyethylene
shipping wrapper and rigging skids.
Step 4 — Install Flue Hood — Flue hood and
screen are shipped screwed to the basepan in furnace
compartment. Remove from shipping location and
using screws provided, install flue hood and screen
in location shown in Fig. 3 or 4. On 48LDT004-006
units, a flue restrictor plate MUST be assembled to
the flue discharge. The plate is shipped with the flue
hood package. Install as shown in Fig. 5.
Step 5 — Trap Condensate Drain — See Fig. 3 or
4 for drain location. A 7/8-in. preformed drain hose
is shipped clamped to the indoor basepan. At instal­
lation, re-route the hose so it passes through the hole
in the indoor basepan and unit base rail.
When installed properly, the hose protrudes
through the base rail one inch. Replace clamp over
the hose where hose passes through the basepan to
ensure that hose remains level. Use a trap at least
4 in. deep and provide protection for trap against
freeze-up.
Step 6 — Install Gas Piping — Unit is equipped
for use with type of gas shown on nameplate. Refer
to local building codes, or, in the absence of local
codes, to ANSI Z223.1-1980 entitled National Fuel
Gas Code.
Natural gas pressure at unit gas connection must
not be less than 5 in. wg or greater than 13.5 in. wg
while unit is operating.
Size gas supply piping for O.Sin.wg maximum
pressure drop. Do not use supply pipe smaller than
unit gas connection. See Fig. 6 for typical pipe guide
and location of external manual main shutoff valve.
For LP gas units, pressure at unit gas connection
must not be less than 12in. wg or greater than
13.5 in. wg.
A 1/8-in. NPT plugged tapping, accessible for test
gage connection, must be installed immediately up­
stream of the gas supply connection to the furnace.
Step 7 — Make Electrical Connections
FIELD POWER SUPPLY
004,005,006,007 — All units except 208/230-volt
units are factory wired for the voltage shown on the
nameplate. If the 208/230-v unit is to be connected
to a 208 power supply, the transformer
must be re­
wired by connecting the blue wire to C-13 and the
red wire to C-DUl.
48HDD,LDD/ HD,LD008 — 230- and 460-volt
units are factory wired for the voltage shown on
nameplate. If unit will be connected to a 208 power
supply, the transformer
must be rewired by connect­
ing the black wire to the 200-volt lead and insulating
the 230-volt lead.
48HHD,LHD/HH,LH008 — 230- and 460-volt
units are factory wired for the voltage shown on
nameplate. If 208/ 230-voIt unit will be connected to
a 208 power supply, the transformer
must be rewired
by connecting the blue wire to C-13 and red wire
to C-DUL
All Units — Refer to unit label diagram for addi­
tional information. Pigtails are provided for field
service. Use factory-supplied splices or UL-
approved copper/aluminum connector.
When installing units, provide a disconnect per
NEC.
All field wiring must comply with National Elec­
trical Code and local requirements.
Install conduit connectors in side panel openings
indicated in Fig. 3 or 4. Route power lines through
connector to terminal connections as shown in
Fig. 7.
Voltage to compressor terminals during opera­
tion must be within voltage range indicated on unit
nameplate (also see Table 2). On 3-phase units,
voltages between phases must be balanced within
2% and the current within 10%. Use the formula
shown in Table 2, Note 2 to determine the % voltage
imbalance. Contact local power company for cor­
rection of improper voltage or phase imbalance.
Operation on improper line voltage or excessive
phase imbalance constitutes abuse and may cause
damage to electrical components. Such operation,
would invalidate any applicable warranty.
FIELD CONTROL WIRING ^ Install a Carrier-
approved accessory thermostat assembly according
to installation instructions included with the acces­
sory. Locate thermostat assembly on a solid wall in
the conditioned space to sense average temperature.