Loading...HEATING A COOLING
50NQ Single-Package Heat Pumps
Installation, Start-Up and Service Instructions
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CONTENTS |
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Page |
SAFETY CONSIDERATION.................................................. |
1 |
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INSTALLATION................................................................... |
1-7 |
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Step 1 —Moving and Setting Unit in Place............................. |
4 |
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ROOFTOP INSTALLATION |
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• GROUND-LEVEL INSTALLATION |
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CLEARANCES |
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Step 2—Condensate Disposal.................................................... |
4 |
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Step 3—Duct Connections......................................................... |
6 |
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Step 4—Electrical Connections................................................ |
6 |
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•HIGH-VOLTAGE CONNECTIONS
•PROCEDURES FOR 208V
•CONTROL VOLTAGE CONNECTIONS
•HEAT ANTICIPATOR SETTING
•CIRCUIT BREAKER
PREPARING UNIT FOR START-UP |
....................................7 |
START-UP AND ADJUSTMENTS......................................... |
9 |
CARE AND MAINTENANCE............................................... |
10 |
NOTE TO INSTALLER: Leave these instructions and the User’s ManurJ with the equipment user after installation.
INTRODUCTION
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.
SAFETY CONSIDERATIONS
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
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, highand lowvoltage 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 |
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OPTIONAL SUPPLY
AIR OPENING
N3
-CONTROL BOX |
BLOWER ACCESS |
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DOOR |
SUPPLY AIR-\
OPENING/DUCT ^
COVER
^1 1/4' |
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f |
31.7 |
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3/4' NPT |
7/8' |
DIA K.O.-^ |
22.2 |
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19.0 |
ALT. |
ELECT. ENTRY |
DRAIN OUTLET |
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RIGHT SIDE VIEW
r-14 21/32 372.3
OPTIONAL RETURN
AIR OPENING
RETURN AIR0PENIN6/DUCT COVER
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ELECTRICAL |
UNIT WT. |
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CORNER WT. LB./KG. |
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CENTER OF GRAVITY |
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UNIT |
CHARACTERISTICS |
LBS. |
KG. |
A |
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B |
C |
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D |
E |
F |
50NQ018 |
208/230/1/60 |
326 |
148 |
100/45 |
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102/46 |
63/29 |
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61/26 |
17-1/2" (444.5) |
24-1/2" (622.3) |
50NQ024 |
208/230/1/60 |
334 |
152 |
102/46 |
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108/49 |
63/29 |
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60/27 |
17" (431.8) |
24" (658.6) |
50NQ030 |
208/230/1/60 |
356 |
161 |
88/40 |
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103/47 |
89/40 |
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76/34 |
21-1/4" (615.9) |
22-3/4" (577.8) |
50NQ036 |
208/230/1/60 |
370 |
168 |
101/46 |
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108/49 |
83/38 |
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78/35 |
20" (508.0) |
24" (658.6) |
50NQ042 |
208/230/1/60 |
375 |
170 |
102/46 |
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112/51 |
85/39 |
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76/34 |
19-3/4" (501.6) |
23-1/2" (596.9) |
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50NQ REQUIRED CLEARANCES CINCHES) |
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UNIT TOP.............................................. |
48 |
BLOWER ACCESS PANEL SIDE........................................... |
30 |
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DUCT SIDE OF UNIT...6 |
MIN. |
CONTROL BOX ACCESS SIDE............................................. |
30 |
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SIDE OPPOSITE DUCTS......................... |
30 |
BOTTOM OF UNIT............................................................... |
0 |
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NOTE. PROVISION MUST |
BE MADE FOR FRESH AMBIENT AIR TO REACH THE |
OUTDOOR |
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COIL WITHOUT RECIRCULATION OF THE AIR FROM THE OUTDOOR FAN DISCHARGE. |
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1 3/8' DIA.CH.V. ENTRY3- |
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35.0 (ACCESSORY |
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ELECTRIC HEAT) |
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7/8' |
DIA.CL.V. |
ENTRY)- |
EVAP COIL |
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22.2 |
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ACCESS PANEL
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U-2 5/16 SQ. |
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58.7 TYP |
3 25/32 -»1 |
---------------------- 38 3/8' |
96.0 |
974.7 |
LEFT SIDE VIEW |
FRONT VIEW |
Fig. 2—Dimensional Drawing—Small Cabinet
OPTIONAL SUPPLY-
AIR OPENING
CO
SUPPLY AIR
DUCT COVER
-CONTROL BOX |
-BLOWER ACCESS |
ACCESS DOOR |
DOOR |
7/8' DIA. K.O.-
22.2
ALT. ELECT. ENTRY
3/4 NPT 19.0
DRAIN OUTLET
RIGHT SIDE VIEW
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ELECTRICAL |
UNIT WT. |
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CORNER WT. LB./KG. |
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CENTER OF GRAVITY |
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UNIT |
CHARACTERISTICS |
LBS. |
KG. |
A |
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B |
C |
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D |
E |
F |
50NQ048 |
208/230/1/60 |
450 |
204 |
120/54 |
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147/67 |
101/46 |
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82/37 |
22-3/4" 577.8 |
28-1/4" 717.5 |
50NQ060 |
208/230/1/60 |
483 |
219 |
128/58 |
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170/77 |
106/48 |
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80/36 |
21-1/2" 546.1 |
27-1/2" 698.5 |
-OPTIONAL RETURN AIR OPENING
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50NQ REQUIRED CLEARANCES (INCHES) |
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UNIT TOP.............................................. |
48 |
BLOWER ACCESS PANEL SIDE........................................ |
30 |
DUCT SIDE OF UNIT...6 |
MIN. |
CONTROL BOX ACCESS SIDE............................................ |
30 |
SIDE OPPOSITE DUCTS........................ |
30 |
BOTTOM OF UNIT.............................................................. |
0 |
NOTES PROVISION MUST BE MADE FOR FRESH AMBIENT AIR TO REACH THE OUTDOOR
COIL WITHOUT RECIRCULATION OF THE AIR FROM THE OUTDOOR FAN DISCHARGE.
1 3/8' DIA.(H.V. ENTRY)-
35.0 (ACCESSORY ELECTRIC HEAT)
LEFT SIDE VIEW
Fig. 3—Dimensional Drawing—Large Cabinet
RATING |
CONTROL BOX |
BLOWER |
PLATE |
ACCESS DOOR |
ACCESS |
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DOOR |
Fig. 4—Rating Plate Location
Step 1—Moving and Setting Unit in Piace
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
Fig. 5—Suggested Rigging
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
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Table 1—Mounting Frame |
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Dimensions |
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©I" |
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Large Cabinet |
Small Cabinet |
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®' I |
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I I |
Item No. |
Length |
Length |
Quantity |
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A |
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^ |
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_j Ui_i/2 " (38mm) |
50 in |
40-3/8 in |
— |
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®^" |
— |
I |
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(1269mm) |
(1024mm) |
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0 |
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—ZZT—j |
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B |
60-1/2 in |
47 in |
— |
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—I [—1-1/2" (38mm) |
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(1535mm) |
(1193mm) |
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MATERIAL; |
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C |
30-1/4 in |
23-1/2 in |
“ |
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ANGLE IRON - 1-1/4" (31 8mm) TO 1-1/2" (38mm) COMM’L STD |
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(766mm) |
(597mm) |
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WELD FRAME TOGETHER |
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12 in (305mm) |
12 in (305mm) |
4 |
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PAINT WITH ZINC-RICH PAINT (RUSTPROOF) |
1 |
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to |
to |
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24 in (610mm) |
24 in (610mm) |
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2 |
60 in |
46-1/2 in |
2 |
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(1523mm) |
(1181mm) |
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3 |
49-1/2 in |
39-7/8 in |
2 |
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(1257mm) |
(1012mm) |
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4 |
49-1/2 in |
39-7/8 in |
1 |
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(1257mm) |
(1012mm) |
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5 |
16 in |
16 in |
8 |
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(406mm) |
(406mm) |
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Fig. 8—Mounting Frame
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