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

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INTRODUCTION

SAFETY CONSIDERATIONS

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1-7

1 4

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

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

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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

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)

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1 3/8' DIA.CH.V. ENTRY3-

7/8' DIA.CL.V. ENTRY)-

22.2

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.

U-2 5/16 SQ.

3 25/32 -»1

96.0

LEFT SIDE VIEW FRONT VIEW

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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

22-3/4" 577.8 28-1/4" 717.5

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

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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.

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LEFT SIDE VIEW

48 BLOWER ACCESS PANEL SIDE........................................30

30 BOTTOM OF UNIT

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1 3/8' DIA.(H.V. ENTRY)-

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

^ _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

2 60 in 3 49-1/2 in 4 49-1/2 in 5

Length

(1269mm)

(1535mm)

(766mm)

12 in (305mm)

24 in (610mm)

(1523mm)

(1257mm)

16 in

(406mm)

Small Cabinet

Length

40-3/8 in

(1024mm)

47 in

(1193mm)

23-1/2 in (597mm)

12 in (305mm)

24 in (610mm)

46-1/2 in

(1181mm)

39-7/8 in

(1012mm)

39-7/8 in

(1012mm)

16 in

(406mm)

Quantity

—

“

Fig. 8—Mounting Frame

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