Carrier 380B User Manual

iNjumber One AirConditbning Maker

Division of Carrier Corporation

Heat Pump — Outdoor Section

INDEX

Page

INSTALLATION................................................ 1-7

Step 1 — Check Equipment and Jobsite . 1

• UNPACKAGE UNIT

• INSPECT EQUIPMENT

• COMPLETE OR CONSIDER SYSTEM REQUIREMENTS

Step 2 — Mount Outdoor Heat Pump .. 3

• ON THE GROUND: MOUNT UNIT ON A SOLID, LEVEL CONCRETE PAD

• ON THE ROOF: MOUNT UNIT ON A LEVEL PLATFORM OR FRAME

Step 3 — Make Piping Connections

_______

3-5

• REPLACE THE ACCURATER™ RE FRIGERANT CONTROL PISTON IN

THE INDOOR COIL AS REQUIRED

• CONNECT REFRIGERANT LINES

Step 4 — Make Electrical Connections .. 5-7

• INSTALL A BRANCH CIRCUIT DISCONNECT PER NEC

• ROUTE LINE POWER LEADS

INTO UNIT

• CONNECT GROUND LEAD AND POWER WIRING

• SEE INDOOR UNIT AND ELECTRIC HEATER INSTALLATION, START-UP AND SERVICE INSTRUCTIONS

• CONNECT CONTROL POWER

WIRING (24 v)

START-UP............................................................ 7

SERVICE............................................................ 7-14

MAINTENANCE................................................ 14-17

SAFETY CONSIDERATIONS

Installation and servicing of air conditioning equipment can be hazardous due to system pres sure and electrical components. Only trained and qualified service personnel should install, repair or service air conditioning equipment.

Untrained personnel can perform basic main tenance functions of cleaning coils and cleaning and replacing filters. All other operations should be performed by trained service personnel. When working 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 brazing oper ations. Have fire extinguisher available for all brazing operations.

WARNING: Before performing sersice or maintenance operations on system, turn off mam power switches to indoor unit and out door unit. Turn off accessory heater power switch if applicable. Electrical shock could cause personal injury'.

INSTALLATION

Step 1 — Check Equipment and Jobsite

UNPACKAGE UNIT — Move to final location. Lift carton off, taking special care not to damage service valves or grilles.

INSPECT EQUIPMENT — File claim with ship ping company if shipment is damaged or incomplete.

COMPLETE OR CONSIDER SYSTEM RE QUIREMENTS before installing the 38QB:

Consult local building codes and National Electrical Code (NEC) for special installation requirements.

When installing, allow sufficient space for airflow clearance, wiring, refrigerant piping and servicing. Position so water or ice from roof cannot drop directly on top of unit.

Make provisions for condensate drainage and defrost water disposal whether unit is installed on ground or roof. (Ensure unit basepan drainage holes are not blocked.) See Step 2 for details. Roof installation method for 38QB depends on building construction and special requirements of local codes. Be sure that roof can support unit weight.

It is recommended that 38 QB units be used with

Carrier approved indoor sections; see Table 1.

System Refrigerant Control on 38QB units and matching Carrier indoor units is a factory-installed AccuRater™ device (bypass type). Bypass-type AccuRater components are discussed in the service section of this booklet. The AccuRater piston has a refrigerant metering hole thru it and is field replace able. Table 2 indicates indoor units for which the

Carrier Corporation 1982

Form 38QB-1SIM

4'-0"(l220mm) OVERHEAD SPACE REQUIRED FOR SERVICE AND AIRFLOW

^ (22 mm) DIAM HOLE

FOR CONTROL WIRING

LIQUID VALVE SERVICE PORT

AIRFLOW SUCTION SERVICE PORT

VAPOR VALVE SERVICE PORT

б" (152 mm) THICK

l|"(35mm) DIAM HOLE

FOR POWER

WIRING

l'-0"(305 mm) GRAVEL APRON

I'-n" (584mm) DIAM

б" (I52 mm) THICK

CONCRETE MOUNTING PAD FOR 38QB0I8

'MARKER TAPE

(HIDDEN)

12" (305mm) GRAVEL APRON

I'-n" {585mm) DIAM x б"(152 mm)THK CONCRETE

MOUNTING PAD FOR 38QB0I8

2-6" (762 mm) DIAM x б" (152mm) THK CONCRETE MOUNTING PAD FOR 38QB024-042

Fig. 1 — Dimensions, Connections and

Mounting Pad (Refer to Table 2)

2'-6"(762mm) DIAM

6" (152 mm THICK

CONCRETE MOUNTING PAD FOR 38QB024-042

Fig. 2 — Accessory Mounting Rack

Table 1 — Carrier Approved 38QB Systems

OUTDOOR

UNIT

38QB

018

024 46

030

036 61

042

‘Replace factory-installed piston with this piston size

REQUIRED OUTDOOR

PISTON

SIZE

INDOOR

UNIT

MODEL &

SIZE

28HQ,VQ024

40AQ024 40DQ024

28HQ.VQ030

40AQ030 40DQ030

28HQ,VQ036

40AQ036 40A0036

28HQ.VQ042

40QB042 40QB042

28HQ.VQ048

REQUIRED

INDOOR

PISTON

SIZE

61*

70*

76*

Table 2 — Installation Data (Fig. 1)

required replacement piston is factory supplied with specified 38QB outdoor unit. Replace piston as described under AccuRater™ Servicing on page 13.

Top Cover Removal — Top cover can be removed for wiring or servicing heat pump. Loosen decora

tive strip and slide down off screw heads. Remove 3 screws in connector plate and 2 screws on front of unit. Loosen remaining 4 screws. Lift top from unit

(See Fig. 1).

Step 2 — Mount Outdoor Heat Pump

ON THE GROUND: MOUNT ON A SOLID, LEVEL CONCRETE PAD (See Fig. 1). Swing 3 legs down and lock in position, except when using

accessory rack. Use accessory heat pump rack (Fig. 2) in areas where prolonged subfreezing tem peratures or heavy snow occur. (Refer to installation instructions included with rack.) Drainage holes in unit base must not be obstructed.

ON THE ROOF: MOUNT UNIT ON A LEVEL PLATFORM OR FRAME. Proper precaution must be taken for support of unit in roof design. Elevate unit for proper clearance as described under ground installation above. Plan roof design and water drainage to prevent unit from setting in water. Flash all roof openings to prevent leaks.

Roof mounted units exposed to winds above 5 mph (8 km/ h) may require protective wind baffles (field fabricated) to achieve adequate defrost.

Step 3 — Make Piping Connections — The

38QB can be connected to indoor units using Carrier accessory tubing package or field-supplied tubing of refrigerant grade. See Table 2 for unit piping connection type and size. See Table 3 for accessory tubing sizes. For requirements beyond 50 ft (15.2 m), obtain information from local Carrier

distributor. Isolate interconnecting tubing from framing and ductwork or where tubing runs thru

stud spaces, enclosed ceilings or pipe chases. Use isolation type hangers. Fig. 3, since rigid fastening transmits pulsations to structure creating objec tionable sound.

A capacity reduction will result if accessory tub

ing is used in 38QB042 systems. For example, when a 25-ft (7.6 m) 7/8-in. (22 mm) accessory package is

used, there is a capacity reduction of 1-1/2 percent.

Table 3 — Accessories

PART NO.

38CQ900081

38CQ900111

38QB90002106 38HQ9000011

28VQ900011 38RQ900081 38RQ900001

38HQ900002 38CQ900172 38RQ900091 38QB90000106 38QB90001106 38HQ90014106 38CQ900141 HC95DD121* HC95DD058*

HC95DD088* HN61HB515* HN61HB496*

TUBING

PACKAGE

38LS958151 38LS958201 20 38LS958251 25 3/8 38LS958301 38LS958351 38LS958401 38LS958501

38LS934151 15 "IMd 3/8 38LS934201 38LS934251 38LS934301 30 3/8 38LS934351 38LS934401 38LS934501 50 3/8 3/8

38LS978151 38LS978201 38LS978251 25 3/8 3/8 38LS978301 30 3/8 3/8 38LS978351 38LS978401 38LS978501

•Available thru Carrier Service Parts fSuction line is insuiated and has 90° bend jpor 5/8-in (7.9-mm) evaporator connection, cut off 3/4-in. (19 05-mm) belled end

••Capacity reduction may occur when 7/8-in, (22 22-mm) accessory tubing is used on 38QB042

Length

(ft)

35 40 50

20 25

35 40

35 3/8 40 3/8

50 '^<2

Low-Voltage Control — Honeywell Thermostat HH07AT171 and Thermostat Subbase HH93AZ173 — (Automatic Changeover)

Low-Voltage Control — Honeywell Thermostat HH07AT171 and Thermostat Subbase HH93AZ175 — (Manual Changeover)

Service Sentry (Six HN65CT004)

Hot Shot® Domestic Water Preheater Twelve 3/4- x 1-1/8 in. connection adapters Bi-Flow Heat Pump Filter Drier (Six KH45LD077) Supplemental Heat Relay — (Required with 2 outdoor thermostats.)

(Service Parts) Outdoor Thermostat (Six 38HQ9000101) Optimizer Control Outdoor Thermostat (Six 38CQ900161 ref HH22AG110) Optimizer II Control Assembly (Use with HH22AG110 outdoor thermostat.)

Heat Pump Rack

Heat Pump Rack Optimizer III (Six 38HQ900141) Solid-State Time Guard It (24-volt) Start Capacitor Start Capacitor

Start Capacitor Relay Relay

Liquid

(in.) (in.)

3/8 3/8 3/8

i ■ m

5/16 5/16 3/8; 5/16 3/8

1/4

ÍL

3/8 3/8 3/8

I'-^.5? r m ".

3/8

? ' '■

3/8

3/8 3/8 3/8

3/8

DESCRIPTION

Tube End OD

3/8 3/8 3/8

3/8 3/8

3/8 3/8 3/8 3/8

3/8

3/8 3/8 3/8

ri^’ 3/4 I

I ’

I 10

i ■ W

10 10 3/4

' Í0

10 7/8^ 10 10

■ ^0

10 7/8*

(in.)

5/8 5/8 5/8 5/8 5/8 5/8

....

: 5/8

3/4 3/4 3/4 3/4 3/4

7/8^

7/8^ 7/8^ 7/8^

7/8*

TUBING

45.7» I

ÍS79

ism

15.7»

miss

ism I

ISiíSl

WM Í0MI

15061

2a 22 I

22.a2i

2222

2ZZH i

22.22 S i

Suctionf

MODEL 38QB

All

042

All

018

024, 030, 036, 042

All

018

024, 030

036 018

024, 030, 036

024, 030

036, 042

Unit

38QB

018

When other than 25 ft (7,6 m) of interconnecting tubing is used, follow special requirements described in Refrigerant Charging. Do not use less than 10 ft

(3 m) of interconnecting tubing. Do not cut 5/ 16-in. (7.94 mm) or 1/4-in. (6.35 mm) liquid line due to swage at ends. Do not cut 7/8-in. (22.22 mm)

suction line. Bend or coil to fit.

Do not use damaged or contaminated tubing.

Always evacuate or purge evaporator coil and tubing system (use field-supplied refrigerant, not unit refrigerant).

When making tubing connections, be sure to

provide clearance at unit for electrical connections.

REPLACE THE ACCURATER™ REFRIG ERANT CONTROL PISTON IN THE INDOOR

COIL AS REQUIRED before connecting refrig erant lines. See Table 1. Correct piston is supplied with 38QB unit. For piston replacement instruc

tions, see AccuRater Servicing on page 13.

Sweat Connection to Compatible Fitting (Use refrigerant grade tubing.)

1. Remove locking nut, rubber O-ring and Schrader core from valve.

2. Cut tubing to correct length.

3. Insert tube into Compatible Fitting. Wrap top CONNECT REFRIGERANT LINES to fittings on unit suction and liquid service valves (Fig. 1).

Liquid service valve has flare fitting; suction service valve has Compatible Fitting. Make suction line

connection first. Slide flare nut on liquid line, then

flare and connect liquid line. Use a maximum torque of 15ft-lb (20N/m) to tighten flare nut.

(Do not disassemble AccuRater.) Unit Compatible

Fitting permits mechanical or sweat connection as

described below.

When a 7/8-in. (22.22 mm) field-supplied suction line is used on 38QB036, a field-supplied 3/4-in. (19.05 mm) to 7/8-in. (22.22 mm) suction line

and bottom of service valves in wet cloth to pre vent damage by heat. Solder with low tempera ture ([430 F] [221 C]) silver alloy solder.

4. Replace Schrader core.

5. Evacuate or purge system with field-supplied refrigerant.

Step 4 — Make Electrical Connections — Field

wiring must comply with local and national fire, safety and electrical codes. Voltage to unit must be within ± 10% of voltage indicated on nameplate. Contact local power company for correction of improper line voltage.

adapter must be provided (not required if 38LS accessory tubing is used).

When a 1-1/8 in. (28.57 mm) field-supplied suc tion line is used on 38QB042, use accessory adapter 28VQ900001 or other field-supplied connection.

Sweat connect refrigerant suction line to 1-1/8 in. (28.57 mm) end of adapter. Connect 3/4-in. (19.06 mm) end of adapter to unit suction line Compatible Fitting.

Do not apply units in system where voltage may

fluctuate above or below permissible limits.

When making electrical connections, provide

clearance at unit for refrigerant piping connections.

See Table 4 for recommended wire and fuse sizes.

Mechanical Connection to Compatible Fitting

(Mate one set of connections at a time.)

1. Loosen nut on Compatible Fitting one turn. Do not remove.

2. Remove plug and be sure O-ring is in the groove inside the Compatible Fitting.

3. Cut tubing to correct length.

4. Insert tube into Compatible Fitting until it bottoms.

5. Tighten nut until it bottoms on back coupler flange. Keep tube bottomed in Compatible Fitting while tightening nut.

Fig. 4 — Urte Power Connections

UNIT

38QB

018 024 030 036

042 230-1

AWG — American Wire Gage

FLA — Full Load Amps HACR — Heating, Air Conditioning and Refrigeration

LRA — Locked Rotor Amps MCA — Minimum Circuit Amps RLA — Rated Load Amps

‘Permissible limits of the voltage range at which the unit will

operate satisfactorily.

V/PH

208-230/1

OPER

VOLTAGE* Max

254

COMPRESSOR

LRA

Min

197

207 98

Table 4 — Electrical Data (60 Hz)

FAN

FLA

RLA 124

155 15 5 20 6

199 2 40

1.25

2.40 2 40 2 40

Min Wire

Size

(AWG)t

14 12 12 10

Max Wire Min Gnd

(ft)

33 32 32 39

tCopper wire sizes based on 60 C Use copper or copper-clad

aluminum wire only Use latest NEC for copper-clad aluminum conductor sizing

{Required when using nonmetallic conduit.

“Maximum dual element size NOTE: All units have 24-v control circuit which requires external

power source

BRANCH CIRCUIT

Wire Sizet

Max Fuse or

HACR Type

CktBkrAmps“

14 12 12 10

25 35 35 45

MCA

168 21 8 21 8 28 2

27.3

THERMOSTAT

SUBBASE

HH93AZI73

OR HH93AZI75

(38QB/40AQ 0R40QB WITHOUT ELECTRIC HEATER)

40AQ OR 40QB FAN COIL COOLING CONTROL KIT

TERMINAL BOARD

COOLING AND ONE-STAGE HEATING

38QB

TERMINAL

BOARD

THERMOSTAT

SUBBASE

HH93AZI73

ORHH93AZI75

COOLING AND TWO-STAGE HEATING

(38QB WITH 40AQ.40QB OR 40FS/28HQ, VQ

SUPPLEMENTAL HEAT, ONE OUTDOOR THERMOSTAT)

EQUIPPED WITH ELECTRIC HEATER;

40AQ OR 40QB ELECTRIC HEATER TERMINAL BOARD

38QB

TERMINAL

BOARD

THERMOSTAT

SUBBASE

HH93AZI73

OR HH93AZI75

COOLING AND TWO-STAGE HEATING

(38QB WITH 40AQ,40QB OR 40FS/28HQ.VQ

SUPPLEMENTAL HEAT. NO OUTDOOR THERMOSTATS)

EQUIPPED WITH ELECTRIC HEATER;

40AQ OR 40QB

ELECTRIC HEATER

TERMINAL BOARD

THERMOSTAT HH07AT 171 40DQ ELEC. HEATER WITHHH93AZI73(AUT0 (ALL MODELS) CHANGEOVER) OR HH93AZI75 LOW VOLTAGE TERM. (MAN CHANGEOVER) SUBBASE SPLICE CONNECTIONS

38QB

TERMINAL

BOARD

THERMOSTAT

SUBBASE

HH93AZI73 OR

HH93AZI75

COOLING AND TWO-STAGE HEATING

EQUIPPED WITH ELECTRIC HEATER;

40AQ OR 40QB

ELECTRIC HEATER

TERMINAL BOARD

(38QB WITH 40FS/28HQ,VQ

TERMINAL

SUPPLEMENTAL HEAT, TWO OUTDOOR THERMOSTATS)

38QB

TERMINAL

BOARD

38QB

BOARD

EHR — Supplemental Heat Relay

ODT — Outdoor Thermostat

-------------

Factory Wiring

Field Wiring

SUPPLEMENTAL HEAT, NO OUTDOOR THERMOSTATS)

‘Transformer (60 va) located in cooling control kit or electric heater tRemove factory-installed jumper (Connection B) when installing outdoor thermostats (ODT)

Fig. 5 — Control Circuit Connections

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