Carrier 48HDT User Manual
Carrier Corporation • Syracuse, N Y 13221
Connbination Heating/Cooling Units
INDEX
Page
SAFETY CONSIDERATIONS
INSTALLATION .......................................................1-16
Step 1 — Provide Unit Support
• ROOF CURB
• SLAB MOUNT
Step 2 — Field Fabricate Ductwork
Step 3 — Rig and Place Unit.................................... I
• POSITIONING
Step 4 — Install Flue Hood
Step 5 — Trap Condensate Drain ........................... 3
Step 6 — Install Gas Piping
Step 7 — Make Electrical Connections
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
• HEAT ANTICIPATOR SETTINGS
Step 8 — Make Outdoor Air Inlet Adjust
ments and Install Outdoor Air Hood
• OPTIONAL OUTDOOR AIR DAMPER
• OPTIONAL ECONOMIZER
Step 9 — Adjust Evaporator Fan Speed
START-UP
SERVICE
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.................................................................
SAFETY CONSIDERATIONS
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1
1
1
3
3
3
10
16
16,17
18-22
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.
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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.
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
Fig. 1 — Roof Curb Details
#
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
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 ULapproved 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 Carrierapproved 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.
must be rewired by connect
=-=^--A ;y.
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Fig. 2 — Rigging Details
Table 1 — Physical Data
UNIT SIZE 48 SERIES 004
OPER WT (lb)
Unit
with Economizer
Roo f Curb 130 130
COMPRESSOR
Qty Type
Oil (oz)
REFRIG (R-22) Capillary Contre
Cha rge (lb) 61
COND COIL
Row s
Fins/in 170
Total F ace Area (sq ft) 6 3
COND FAN
Nom Cfm 2200 3100
Qty Diam (in ) 1 22
Motor Hp
Motor Rpm
EVAP COIL
Row s 2 2
Fins/in
Total F ace Area (sq ft) 5 33 5 33
EVAP FAN
Qty Size (in ) 1 10x10 1 10x10
Type
Nom Cfm
Motor Hp Std
Nom M otor Rpm
Std/Opt Low 800/ 890
Rpm Range Std
Motor Pulley
Pitch D iam
(in )
Fan Pulley
Pitch D iam
(in )
Belt. Q ty Type. Length (in
Speed Change per Full
Turn of Moveable
Pulley Flange (Rpm )
Moveable Pulley
Max Full Turns
from C losed Position
Factory Setting Std
Full Turns Open Opt
Factory Speed Setting Std
(Rpm) Opt
FUR NACE SECTION
Tem p Rise (F)
Heating Input (Btuh)
Output Cap (Btuh)
Burner Orifice D iam
(in . drill size)
Natural Gas
Pilot Orifice Diam
(in drill size)
Natural Gas
Thermostat Heat Anticipator
Setting 460 v
HIG H-PRESS SWITCH
Cutout (psig)
Reset (psig)
LOW -PRESS SW ITCH
(Suction Line)
Cutout (psig)
Reset (psig)
AIR INLET SCREEN S
Qty. Size (in )
RETURN AIR FILTERS
Qty Size (in )
High
208/230V
LDT
630
655
1 M4023E
42
2
%
850 1075
140 140
DD DD
1200 1500
Opt 3/4
'/3
— —
850/1050 1000
—
— —
LDT HDT
30-60
80,000
61,600
Std
Opt
Std
Opt
Std
Opt
Opt
005 006
HDT ] LDT HDT LDT HH
650 630
675 1 655 685 665
1 P53260 1 P6026B 1 P60-6- 1 P77
66
660
640 660 640 720 720
130
66
48 72 7 2 I 9 3 99
2
170 140
6 3
1 22 1 22
’/2 ’/2
3/4
— —
890 1000
—
35-65
120,000
92,400
LDT HDT
30-60
80,000
61,600
9 73 9 73 108 15 6
3800
1075 1075 1075 1075
140 140 140 13 9
5 33
HDT LDT
1 11x10
35-65
1 20,000
92,400
1 11x10 1 11x10 1 11x10 1 11x10 1
DD DD BD
2000 2000
1
—
1130 1050/1130
— —
—
3/4
1
—
890/1000
—
LDT HH
30-60
80,000
61,600
1 2
1 0
27 ± 4
67 ± 7
1 32x19xV2
1 16x25x1
1...20x25x1
006
LH
— —
— —
74 74
Copper Tube, Aluminum Plate Fins
Copper Tube, Aluminum Plate Fins
2 : 2
14 0 140 139
Propeller Type
3800
1 22 1 22 22
’/2 '/2
3 A
5 33 6 3 8 2
HH LH
DD
2000
’/2
3/4
1725
__
—
630- 960
796-1130
1 9-2 9
2 4-3 4
5 2
5 2
66
66
830
995
35-65
120,000
92,400
2
2
2000
3/4
1 1
_
890/1000
1050/1130
-
—
LH HD
30-60
80,000
61,600
007
HD HH
745
130
_
—
HD.HH
890
950 (HD)
125 (HD)
008
946 (LD)
125 (LD)
1 Hermetic
124
LD.LH
886
4000
BD
2200
3/4
1725
796- 130 838-1032 (@ 2 turns open)
930-1260 352-11 27 (@ 1 turn open)
2 4-3 4
2 8-3 8
5 2
5 2
1 A 43
66
66
2
2
995
35-65
120,000
92,400
113 0
120,000
HD.HH LD.LH
HH
35-65
92,400
35-65
203 ,000
160 ,370
132 29 113 33 132 29
036 64 033 66
15-45
114 ,000
91,200
008
HDD.H LD
945 941
1005(HDD)
125 (HDD)
2 P46
6 2 per system
4500
’/2
3
12x12
BD
3000
1 0
1 5
—
_
—
2 4-3 4
2 4-3 4
50
5 0
65
69
4
4Y2
907
885
HHD.HDD LDD.LHD
35-65
203 ,000
160 ,370
036 64
1 2
1 0
426 ± 7
320 ± 20
27 ± 4
67 ± 7
2 16x20x1
2 20x20x1
124
LDD.LHD
996 (LDD)
125 (LDD)
15-45
114 ,000
91,200
113 33
033 66
#
DD — Direct Drive
-----
------
■■ . •* .*
Fig. 3 — Downshot Base Unit Dimensions
Fig. 4 — Horizontal Base Unit Dimensions
Fig. 5 — Flue Hood Details;
48LDT004-006 Units
BLK-
*NPT plug is field supplied
NOTE Follow all local codes
Fig. 6 — Gas Piping Guide
-YEL
-i?
FIELD POWER SUPPLY
'“dTsconnectI
230-1-60 u_PifLNJc_l
004,005,006,007 UNITS
BLK
TO
COMP
208/230-3-60 (SEE NOTE)
■ YEL •
BLU-
FIELD POWER SUPPLY
I
I
I
44
roTsCONNECT"!
PER NEC
004,005,006,007 UNITS
I
-------
I
I—dn
I
H--------
EQUIP
GND
UM
EQUIP
GND
TO INDOOR
FAN CONTACTOR
BLK •
■ YEL ■
-BLU-
FIELD POWER SUPPLY
008 UNITS
I
I
I
-+
Ti^sconne'ct”!
I
PER NEC
EQUIP
--Q®]
I
H--------
I
GND
■ Factory Wiring
. Field Wiring
NOTE If connected to 208-v power supply, rewire unit transformer
no 1 by
1 Connecting blue wire from transformer no 1 to C-13
2 Connecting red wire from transformer no 1 to C-DUl
Fig. 7 — Power Wiring Connections
8
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