Carrier 50NQ User Manual
50NQ
HEATING A COOLING
Single-Package Heat Pumps
Installation, Start-Up and Service Instructions
CONTENTS
Page
SAFETY CONSIDERATION
INSTALLATION
Step 1 —Moving and Setting Unit in Place
• ROOFTOP INSTALLATION
• GROUND-LEVEL INSTALLATION
• CLEARANCES
Step 2—Condensate Disposal....................................................4
Step 3—Duct Connections.........................................................6
Step 4—Electrical Connections
• HIGH-VOLTAGE CONNECTIONS
• PROCEDURES FOR 208V
• CONTROL VOLTAGE CONNECTIONS
• HEAT ANTICIPATOR SETTING
• CIRCUIT BREAKER
PREPARING UNIT FOR START-UP
START-UP AND ADJUSTMENTS
CARE AND MAINTENANCE...............................................10
NOTE TO INSTALLER: Leave these instructions and the
User’s ManurJ with the equipment user after installation.
Model 50NQ Packaged Heat Pump Units are fully selfcontained, heating/cooling units designed for outdoor instedlation. These units may be installed either on a rooftop or
ground-level slab. For rooftop downflow applications, an
accessory roof-mounting curb may be used.
Installing and servicing Eur conditioning equipment can be
hazardous due to system pressure and electrical compo
nents. Only trained and qualified service personnel should
install or service air conditioning equipment.
Untrained personnel can perform basic meiintenance func
tions such as cleaning coils and filters and replacing filters.
All other operations should be performed by trained service
personnel. When working on air conditioning equipmei^,
observe precautions in the literature and on tags and labels
attached to unit.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for brazing operations. Have
fire extinguisher available.
Recognize safety information: This is the safety-alert sym
bol A, when you see this symbol on the unit and in instruc
tions or manuals, be alert to the potential for personal
injury.
Understand the signal word—DANGER, WARNING or
CAUTION. These words are used with the safety-alert sym
bol. DANGER identifies the most serious hazards which
will result in severe personal injury or death. WARNING,
on the other hand could result in personal injury or death.
CAUTION is used to identify unsafe practices, which would
...................................................................
INTRODUCTION
SAFETY CONSIDERATIONS
..................................................
.............................
................................................
....................................
.........................................
1-7
1
4
6
7
9
Fig. 1 —Model 50NQ
result in minor personal injury or product and property
damage.
1. This installation must conform with eJI applicable local
and national codes.
2. The power supply (volts, hertz, and phase) must corre
spond to that specified on unit rating plate. (See Fig. 4
for location.)
3. The electrical supply provided by the utility must be
sufficient to handle load imposed by this unit.
4. Refer to the dimensional drawings (Figs. 2 and 3) for
locations of electriceJ inlets, condensate drain, duct
connections, and required clearances before setting
unit in place.
5. Unit designed for outdoor installation on wood flooring
or on class A, B, or C roof covering materials.
GENERAL
Model 50NQ Packaged Heat Pump has been designed and
tested in accordance with ARI Standard 240, 270 and U.L.
Standard 559.
These units are factory-charged with R-22 refrigerant.
Installation is simple: connect air ducts, high- and low-
voltage wiring, condensate drain, and install a field-supplied
air filter.
All units can be connected into existing duct systems that
are properly sized and designed to handle an airflow of 375
to 450 Cfm per each 12,000 Btuh of rated cooling capacity.
Refer to pre-sale literature for detailed air delivery capacity.
NOTE: When installing any accessory item, see the manu
facturer’s Installation Instructions packaged with the
accessory. The Qualified Agency must use factory author
ized kits or accessories when modifying this unit.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book| 1 I 4 PC 101 Catalog No 565-116 Printed in U.S.A Form 50NQ-1SI Pg 1 7-89 Replaces: New
Tab 15a 15a
N3
OPTIONAL SUPPLY
AIR OPENING
-CONTROL BOX
BLOWER ACCESS
DOOR
SUPPLY AIR-\
OPENING/DUCT ^
COVER
r-14 21/32
372.3
RETURN AIR-
0PENIN6/DUCT
COVER
OPTIONAL RETURN
AIR OPENING
UNIT CHARACTERISTICS LBS. KG.
ELECTRICAL UNIT WT. CORNER WT. LB./KG. CENTER OF GRAVITY
50NQ018 208/230/1/60 326 148
50NQ024 208/230/1/60
50NQ030 208/230/1/60 356 161 88/40
50NQ036 208/230/1/60 370 168 101/46 108/49 83/38 78/35 20" (508.0)
50NQ042 208/230/1/60 375
334 152
A B
100/45
102/46 63/29
102/46 108/49 63/29
103/47 89/40 76/34 21-1/4" (615.9) 22-3/4" (577.8)
170 102/46 112/51
UNIT TOP
..............................................
DUCT SIDE OF UNIT...6 MIN. CONTROL BOX ACCESS SIDE
SIDE OPPOSITE DUCTS.........................30 BOTTOM OF UNIT
NOTE. PROVISION MUST BE MADE FOR FRESH AMBIENT AIR TO REACH THE OUTDOOR
COIL WITHOUT RECIRCULATION OF THE AIR FROM THE OUTDOOR FAN DISCHARGE.
EVAP COIL
ACCESS PANEL
D E F
C
61/26 17-1/2" (444.5) 24-1/2" (622.3)
60/27
76/34 19-3/4" (501.6) 23-1/2" (596.9)
85/39
50NQ REQUIRED CLEARANCES CINCHES)
48 BLOWER ACCESS PANEL SIDE...........................................30
17" (431.8)
24" (658.6)
24" (658.6)
.............................................
...............................................................
1 3/8' DIA.CH.V. ENTRY3-
7/8' DIA.CL.V. ENTRY)-
22.2
30
0
35.0 (ACCESSORY
ELECTRIC HEAT)
RIGHT SIDE VIEW
^1 1/4'
31.7
3/4' NPT
19.0
DRAIN OUTLET
7/8' DIA K.O.-^
22.2
ELECT. ENTRY
ALT.
f
U-2 5/16 SQ.
3 25/32 -»1
96.0
LEFT SIDE VIEW FRONT VIEW
-
---------------------
58.7 TYP
38 3/8'
974.7
Fig. 2—Dimensional Drawing—Small Cabinet
UNIT
50NQ048 208/230/1/60 450 204
50NQ060 208/230/1/60
LBS. KG.
483
ELECTRICAL UNIT WT.
CHARACTERISTICS
A B C
120/54 147/67 101/46
219 128/58
CORNER WT. LB./KG. CENTER OF GRAVITY
170/77 106/48 80/36 21-1/2" 546.1 27-1/2" 698.5
82/37
D
E
22-3/4" 577.8 28-1/4" 717.5
F
CO
OPTIONAL SUPPLY-
-CONTROL BOX
ACCESS DOOR
AIR OPENING
3/4 NPT
19.0
DRAIN OUTLET
RIGHT SIDE VIEW
-BLOWER ACCESS
DOOR
7/8' DIA. K.O.-
22.2
ALT. ELECT. ENTRY
SUPPLY AIR
DUCT COVER
-OPTIONAL RETURN
AIR OPENING
50NQ REQUIRED CLEARANCES (INCHES)
UNIT TOP
..............................................
DUCT SIDE OF UNIT...6 MIN. CONTROL BOX ACCESS SIDE
SIDE OPPOSITE DUCTS
NOTES PROVISION MUST BE MADE FOR FRESH AMBIENT AIR TO REACH THE OUTDOOR
COIL WITHOUT RECIRCULATION OF THE AIR FROM THE OUTDOOR FAN DISCHARGE.
........................
LEFT SIDE VIEW
48 BLOWER ACCESS PANEL SIDE........................................30
30 BOTTOM OF UNIT
............................................
..............................................................
1 3/8' DIA.(H.V. ENTRY)-
30
0
35.0 (ACCESSORY
ELECTRIC HEAT)
Fig. 3—Dimensional Drawing—Large Cabinet
Fig. 5—Suggested Rigging
RATING CONTROL BOX BLOWER
PLATE ACCESS DOOR ACCESS
Fig. 4—Rating Plate Location
Step 1—Moving and Setting Unit in Piace
DOOR
A CAUTION
Use spreader bars and crate top when rigging the unit
to be lifted. Model 50NQ must be rigged for lifting as
shown in Fig. 5. Use extreme caution to prevent dam
age when moving the unit. Unit must remain in an
upright position during all rigging and moving opera
tions. The unit must be level for proper condensate
drainage; therefore, the ground-level pad or accessory
roof-mounting curb must be level before setting the
unit in place. When a field-fabricated support is used,
ensure that the support is level and properly supports
the unit.
ROOFTOP INSTALLATION
A CAUTION
When installing the unit on a rooftop, be sure that the
roof will support the additional weight. Refer to Figs. 2
and 3 for total weight and corner weight information.
For downflow applications, an accessory roof-mounting
curb may be installed on, and flashed into the roof before
unit installation. The instructions for installing the acces
sory curb are packaged with the curb.
For end-discharge applications place the unit on a level base
that provides proper support. Refer to Fig. 7 for location of
additional supports/sleepers. On flat roofs, be sure that the
unit is located at least 4 ins. above the highest expected
water level on the roof to prevent flooding.
GROUND-LEVEL INSTALLATION
Place the unit on a solid, level, concrete pad that extends
approximately 2 ins. beyond the casing on all four sides of
the unit. Do not secure the unit to the pad except when
required by local codes. Ensure pad does not obstruct coil
drainage holes in bottom of unit. (Holes drain water during
cooling and defrost cycles.) In areas where prolonged sub
freezing temperatures or snowfall occur, increase clearance
to 12-18 ins. by constructing an angle-iron frame to support
the unit. The frame should be designed so as not to block
the drainage holes. See Fig. 8 and Table 1 for recommended
frame construction. Extend a 24-in. gravel apron around
pad for condensate and defrost water drainage.
CLEARANCES
The required minimum operating and service clearances are
shown in Figs. 2 and 3. Adequate condenser air must be
provided.
A CAUTION
Do not restrict condenser airflow. An air restriction at
either the outdoor-air inlet (the entire surface of the out
door coil) or the fan discharge can be detrimental to
compressor life.
The condenser fan discharges through the top of the unit.
Ensure that the fan discharge does not recirculate to the
condenser coil. Do not locate the unit in either a corner or
under a complete overhead obstruction. The minimum clear
ance under a partial overhang (such as a normal house roof
overhang) is 48 ins. above unit top. The maximum horizon
tal extension of a partial overhang must not exceed 48 ins.
Do not locate the unit where water, ice, or snow from an
overhang or roof will damage or flood the unit by falling on
the top. Do not locate the unit where grass, shrubs, or other
plants will interfere with the airflow either into or out of the
unit. Do not install the unit on carpeting, tile, or other com
bustible material other than wood flooring. Heat pump may
be installed on wood flooring or on Class A, B, or C roof cov
ering materieds.
Step 2—Condensate Disposal
NOTE: Ensure that condensate-water disposal methods
comply with IoceJ codes, restrictions, and practices.
Model 50NQ disposes of condensate water through a 3/4-in.
NPT drain fitting. See Figs. 2 and 3 for location.
Install a 3-in. trap at the dredn fitting to ensure proper
drainage. See Fig. 6. Meike sure that the outlet of the trap is
at least 1 in. lower than the unit drain pan connection to
prevent the pan from overflowing. Prime the trap with
water.
If the installation requires draining the condensate water
away from the unit, connect a drain tube using a minimum
of 7/8-in. OD copper tubing, 3/4-in. gedvemized pipe, or
3/4-in. plastic pipe. Do not undersize the tube. Pitch the
1" MIN.
2" MIN.
A88130
♦These embossments are located on Large Cabinet Units (048-060 size only.)
Fig. 7—Additional Support/Sleeper
Location
©I" -------------®' I ~ I I
^ _j Ui_i/2" (38mm)
®^" — I
0 —ZZT—j
MATERIAL;
ANGLE IRON - 1-1/4" (31 8mm) TO 1-1/2" (38mm) COMM’L STD
WELD FRAME TOGETHER
PAINT WITH ZINC-RICH PAINT (RUSTPROOF)
—I [—1-1/2" (38mm)
Table 1—Mounting Frame
Dimensions
Large Cabinet
Item No.
A 50 in
B 60-1/2 in
C 30-1/4 in
1
2 60 in
3 49-1/2 in
4 49-1/2 in
5
Length
(1269mm)
(1535mm)
(766mm)
12 in (305mm)
to
24 in (610mm)
(1523mm)
(1257mm)
(1257mm)
16 in
(406mm)
Small Cabinet
Length
40-3/8 in
(1024mm)
47 in
(1193mm)
23-1/2 in
(597mm)
12 in (305mm)
to
24 in (610mm)
46-1/2 in
(1181mm)
39-7/8 in
(1012mm)
39-7/8 in
(1012mm)
16 in
(406mm)
Quantity
—
—
“
4
2
2
1
8
Fig. 8—Mounting Frame