Carrier 50NQ User Manual download pdf

HEATING A COOLING

50NQ

Single-Package Heat Pumps

Installation, Start-Up and Service Instructions

CONTENTS

Page

SAFETY CONSIDERATION

..................................................

INSTALLATION

...................................................................

1-7

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.

INTRODUCTION

Model 50NQ Packaged Heat Pump Units are fully self-

contained, heating/cooling units designed for outdoor insted-

lation. 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, 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

1 2 3 4 5 6 ... 15 16

Summary of Contents

Page 1 - Single-Package Heat Pumps

HEATING A COOLING50NQSingle-Package Heat PumpsInstallation, Start-Up and Service InstructionsCONTENTSPageSAFETY CONSIDERATION...

Page 2

INDOOR AIRFLOW AND AIRFLOW ADJUSTMENTSA CAUTIONFor proper operation, the recommended airflow is 375 to 450 CFM for each 12,000 BTUH of rat

Page 3

Table 2—Models 50NQ Air Delivery (Cfm) in 208V-Horizontal Fiow Set-up at indicated Externai Static Pressure & Voltage (Sizes 018, 024,030, 036, 04

Page 4

Table 5—Minimum Airfiow for Safe Electric Heater OperationSIZE018024 030 036 042 048 060AIRFLOW(CFM)600800 1000120014001600 2000Tabie 6—Wet Coil Press

Page 5 - 2" MIN

FLARENUTSTRAINERCOILRUBBER 0-RINGSTAMPED ARROW ON COUPLING BODY (TOWARD INDOOR COIL)STRAINER RETAINERA87292Fig. 11—Metering Device (Duai-Piston) Compo

Page 6

UNIT SINGLE-PHASE COMPRESSORS are equipped with a Compressor Start Thermistor (PTC device). When supply voltage is within 10% limit and com

Page 7

TROUBLESHOOTING CHART—COOLING CYCLETROUBLESHOOTING CHART—HEATING CYCLELOW LINE VOLTAGE OK UNBALANCED 3 PHASE LINECOMPRESSOK POWER supplì OPENOEFLCIIVE

Page 8 - HR — Heater Relay

Manufacturer resenres the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.Book

Page 9

r-14 21/32 372.3OPTIONAL SUPPLY AIR OPENINGN3ELECTRICAL UNIT WT. CORNER WT. LB./KG. CENTER OF GRAVITYUNIT CHARACTERISTICS LBS. KG.A BCD E F50NQ018 208

Page 10 - A WARNING

OPTIONAL SUPPLY- AIR OPENINGCOELECTRICAL UNIT WT.CORNER WT. LB./KG. CENTER OF GRAVITYUNITCHARACTERISTICSLBS. KG.A B CDEF50NQ048 208/230/1/60 450 20412

Page 11

RATING CONTROL BOX BLOWERPLATE ACCESS DOOR ACCESSDOORFig. 4—Rating Plate Location Step 1—Moving and Setting Unit in PiaceA CAUTIONUse spreader bar

Page 12

1" MIN.2" MIN.A88130♦These embossments are located on Large Cabinet Units (048-060 size only.)Fig. 7—Additional Support/Sleeper Location©I&q

Page 13

drain tube downward at a slope of at least 1 in, in every 10 ft of horizontal run. Be sure to check the dreun tube for leaks.Condensate wa

Page 14 - Checking Start Thermistor

HIGH-VOLTAGE CONNECTIONSThe unit must have a separate electrical service with a field- supplied, waterproof disconnect switch mounted at, or wit

Page 15

THERMOSTAT 8 SUBBASE (SEE BELOW)&&0-0-B-[£>0-UNITCONTROL WIRING TERMINAL BOARD0)-<D0)<8>-B)COOLING AND ONE-STAGE HEATING (without

Page 16 - Tab 15a 15a

d. Make sure that all tools and miscellaneous loose parts have been removed.Unit is now ready for initial steirtup.REFRIGERANT LEAKSProceed as follow

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Carrier 50NQ User Manual

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