Carrier 38QF User Manual

Number One Air Conditioning i\Mer

^Sb Division of

^ 0 Carrier Corporation

Carrier Parkway • Syracuse, N.Y. 13221

Heat Pump — Outdoor Section

CONTENTS

Page

SAFETY CONSIDERATIONS INSTALLATION Step 1 — Check Equipment and Jobsite

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

.. 1

. 1-5

.. 1

• UNPACK UNIT

• INSPECT EQUIPMENT

• COMPLETE OR CONSIDER SYSTEM REQUIREMENTS

Step 2 — Mount Outdoor Heat Pump..................2

• 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

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

• REPLACE THE ACCURATER™ RE FRIGERANT CONTROL PISTON IN

THE INDOOR COIL AS REQUIRED

• CONNECT REFRIGERANT LINES

Step 4 — Make Electrical Connections ... 4

• 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

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

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

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

SAFETY CONSIDERATIONS

5-7

Installation and servicing of air conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and quali

fied service personnel should install, repair or serv ice 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 braz ing operations.

W.ARNING: Before performing scr\icc or maintenance operations on sxstem. turn ofl

main powci switches to indoor unit and out door unil. 1 urn ofl acccssoiA heater power switch if applicable, riectrical shock could cause personal itijur\.

INSTALLATION

Step 1 — Check Equipment and Jobsite

UNPACK 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 38QF.

Consult local building codes and National

Electrical Code (NEC) for special installation requirements.

When installing, allow sufficient space for air

flow clearance, wiring, refrigerant piping and serv icing. 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 in stallation method for 38QF depends on building construction and special requirements of local codes. Be sure that roof can support unit weight.

It is recommended that 38QF units be used with

Carrier approved indoor sections; see Table 1.

System Refrigerant Control on 38QF 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 1 indicates indoor units for which the required replacement piston is factory supplied with specified 38QF 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 UNIT ON A SOLID, LEVEL CONCRETE PAD (see Fig. I).

4-0"0VERHEAD SPACE REQUIRED

FOR SERVICE AND AIRFLOW

DIAM HOLE FOR CONTROL WIRING

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.

AIRFLOW AND SERVICE CLEARANCE

LIQUID VALVE SERVICE PORT / VAPOR VALVE SERVICE PORT

AIRFLOW SUCTION SERVICE PORT

CONCRETE MOUNTING PAD

Fig. 1 — Dimensions, Connections and

Mounting Pad (Refer to Table 2)

Fig. 2 — Accessory Mounting Rack

Table 1 — Carrier Approved 38QF Systems

OUTDOOR

UNIT 38QF

018

024 46

030

036

042

048

060

^Factory-supplied piston packages shipped in outdoor unit. Replace remain

ing indoor pistons with size indicated.

REQUIRED OUTDOOR

PISTON

SIZE

76 40QB/QH060 86*

INDOOR

UNIT

MODEL &

SIZE

40AQ018

28HQ/VQ018

40AQ024

28HQ/VQ024

40FS075,28HQ/VQ042

40AQ024

28HQ/VQ024

40AQ030

28HQ/VQ030

40FS075,28HQ/VQ042

40AQ030

28HQ/VQ030

40DQ030

40AQ036

28HQ/VQ036

40AQ036 28HQ/VQ036 40QB/QH042 28HQ/VQ042

40QB/QH042 28HQ/VQ048 40QB/QH048

40QB/QH048 84 28HQ/VQ048 84

40QB/QH062 28HQ/VQ060

40QB/QH060 40QB/QH062

REQUIRED

INDOOR

PISTON

SIZE

70* 70*

70 70 73* 73*

76 78 78

86* 86*

52 52 55* 55*

59 59 61* 61* 65

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 unit exposed to winds above 5 mph may require protective wind baffles (field fabricated) to achieve adequate defrost.

Step 3 — Make Piping Connections — Heat

pumps may be connected to indoor sections using

Carrier accessory tubing package (Table 3) or field-

supplied tubing of refrigerant grade, correct size and condition (Table 2). For requirements beyond 50 ft obtain information from local Carrier distributor.

-> Table 3 — Accessories

Table 2 — Installation Data (Fig. 1)

UNIT 38QF OPER WT(lb) DIMEN (ft-in.)

DIam (A) Height (B) Mtg Pad

(Diam X Thick)*

REFRIG CONN (in.)

Suction (ODF) Liquid (ODF)

REFRIG LINES (in.)

Suction (ODF) Liquid (ODF)

“■Mounting pad is fieid suppiied, fMay use Vs-'m. accessory tubing package (slight capacity loss). See Tabie 3.

024 030 036 042

018

163 181 189 209

160

2-2'V32 j 2-8Y32 [3-13/4

2- 53/32

2-6 X 0-6

1-1

1-10/2

% 1 1 Vaf

048 265

3-23/33

2-83/61 3-2’/e

3-3 X 0-6

1 -5%

3/s

3/8

060 298

2-7

PART NO.

99TZ90040106

99TZ90041106 38QB90002106

28VQ900011 38RQ90008106

HN61KL704 380890004106

38CQ900172 38RQ90009106

38QB90001106 38QF90000106 38QB90003106 38QF90001106t HC95DE088* HC95DD121* HC95DD121“ HC95DE070* HN61KA054*

HN61HB515* HN61HB510* HN61HB505* HN61HB504* 38EB660002*

TUBING

PACKAGE

38LS978151 38LS978201 38LS978251 38LS978301 38LS978351 38LS978401 38LS978501

■“Available thru Carrier Service Parts. fStart capacitor and relay are required when using liquid line solenoid valve.

{Suction line is insulated and has 90° bend.

“■“Capacity reduction may occur when %-in. accessory tubing is used on 38QF042.

Low-Voltage Control — Honeywell Thermostat HH07AT171 and Thermostat Subbase HH93AZ173 — Automatic Changeover (Six 99TZ900401)

Low-Voltage Control — Subbase HH93AZ175 ■

Service Sentry — Standard on 38QF060 (Six HN65CT004)

Twelve M x IVs-in. connection adapters

Bi-Flow Heat Pump Filter Drier — Ref KH45LD077 (Six 38RQ900081)

Supplemental Heat Relay ■ (Six 38RQ900001)

Outdoor Thermostat (Six 38QB900041) Optimizer Control Outdoor Thermostat — Ref HH22AG110 (Six 38CQ900161) Optimizer II Control Assembly — Use with HH22AG110 outdoor thermostat.

(Six 38RQ900091) Heat Pump Rack (Six) Heat Pump Rack (Six)

Solid-State Time Guard I

Liquid Line Solenoid (Six 38QF900011) Start Capacitor

Start Capacitor Start Capacitor Start Capacitor Start Relay Start Relay Start Relay Start Relay Start Relay

Wire Bundle for Start Capacitor and Relay

LENGTH

(ft)

25 30 35 40 50

(in.)

Ve Va

Ye Ys Ya Ya

Honeywell Thermostat HH07AT171 and Thermostat

DESCRIPTION

Manual Changeover (Six 99TZ900411)

■ Required with 2 outdoor thermostats.

24 volt (Six 38QB900031)

Liquid

Tube End OD

(in.

Ya Ya Ya Ya Ya Ya

(in.)

Ya** Ya**

Ya** Ya** Ya** Ya** Ya**

TUBING

Suction^

Tube End OD

Evap

(in.)

% 3/4 3/4

34 3/4 3/4

Cond

(in.)

3/4

Ya Ya

3/4 3/4

MODEL 38QF

All

018-048 030-060

All

018-042

048,060

All 018 024 030

036,042

018 024

030 036 042

All

MODEL

38QF

All

WARNING: If unclcrsi7ed. damaged or elliptiv.-all\-s!iapL'd uibing is used when making Compatible bitting, leaks ma\ result.

If 1-1/8 in. tubing is used, braze it to the accessory

1-1/8 X 3/4-in. suction connection adapter (Carrier Part No. 28VQ900011) or to a correctly sized fieldsupplied adapter, then make Compatible Fitting connections. 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.

^ ( \l 1 ION. IK) \OI Ml \<\ MORI I II \\

'' I I ()l I INI SI I IN (.ROl N1). II .m> '•ac tion of liucsel is burictl. there must be b-in. \ertical rise to the \al\e connections on the outdoor unit. If more than the recommended

length i.s buried, refrigerant ma\ migrate to the eooler buried .section during extended periods of

unit shutdown, causing relrigerant slugging and

possibh compressor damage at start-up.

A capacity reduction will result if accessory tub ing is used in 38QF systems. For example, when a 25-ft 7/8-in. accessory package is used, there is a capacity reduction of 1-1/2 percent.

When other than 25 ft of interconnecting tubing is used, follow special requirements described in Refrigerant Charging. Do not use less than 10 ft of interconnecting tubing. Do not cut 7/8-in. 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 38QF unit. For piston replacement instruc tions, see AccuRater Servicing on page 13.

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 15 ft-lb to tighten flare nut. (Do not dis assemble AccuRater.) Unit Compatible Fitting permits mechanical or sweat connection as de scribed below.

When a 7/8-in. field-supplied suction line is used on 38QF, a field-supplied 3/4-in. to 7/8-in. suction line adapter must be provided (not required if 38LS accessory tubing is used).

When a 1-1/ 8 in. field-supplied suction line is used on 38QF, use accessory adapter 28VQ900011 or other field-supplied connection. Sweat connect re

frigerant suction line to 1-1/8 in. end of adapter. Connect 3/4-in. end of adapter to unit suction line Compatible Fitting.

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 0-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.

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 and bottom of service valves in wet cloth to pre vent damage by heat. Solder with low tempera ture (430 F) 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 permissible limits indicated on nameplate.

Contact local power company for correction of

improper line voltage.

W.AR.NTNG: Operation of units on improper line \oliagc constiiiitcs abuse and could affect

Carrier warrantx. See fable4.

Do not apply units in system where voltage may

fluctuate above or below permissible limits.

Table 4 — Electrical Data (60 Hz)

OPER

UNIT

38QF

018 024

030 036 042

048 060

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

V/PH

230/1

208-230/1

230/1

VOLTAGE*

Max

254

Min LRA RLA

197

207

COMPR

50 54

69 17.7 75 90

101

130

FAN

FLA

10.8 14 30

13.0

16.8 10 50

20.0

21.2

28.6

1.1

1.7

When making electrical connections, provide clearance at unit for refrigerant piping connections. See Table 4 for recommended wire and fuse sizes.

INSTALL A BRANCH CIRCUIT DISCONNECT PER NEC of adequate size to handle unit starting current. Provide a separate disconnect for outdoor unit, indoor unit and for each accessory electric

heater circuit as required. (See Indoor Unit and

Electric Heater Installation, Start-Up and Service Instructions.) Locate disconnect(s) within sight from and readily accessible from the unit; per sec tion 440-14 of National Electrical Code (NEC).

ROUTE LINE POWER LEADS INTO UNIT — Extend leads from disconnect thru power wiring hole provided (see Fig. 1) and into unit splice area. Remove top cover to gain access to unit wiring.

CONNECT GROUND LEAD AND POWER WIRING — Connect ground lead to a ground lug in control box for safety. Then connect power wiring. See Fig. 4. Splice line power leads to yellow and

black pigtails. Use wire nuts and tape at each con nection. Connect unit wiring to copper wire only.

SEE INDOOR UNIT AND ELECTRIC HEATER INSTALLATION, START-UP AND SERVICE INSTRUCTIONS for line power wiring details. All

control wiring is shown in this booklet.

BRANCH CIRCUIT

Min Wire

(AWG)t

12 10 48

10 43 10 10

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

operate satisfactorily. tCopper wire sizes based on 60 C. Use copper wire only. fRequired when using nonmetallic conduit.

**Time-delay fuse

Max Wire Min Gnd

(ft)

39 46

Wire Size$

14 12

10 10

CONNECT CONTROL POWER WIRING (24 V) — Extend wiring thru hole provided (Fig. 1) and into low-voltage section of unit control ring. Connect leads to control wiring terminal board as shown in Fig. 5.

Use indoor unit transformer as 24-v supply for system. At least a 60-va transformer is recom mended. Carrier approved indoor units are equipped

with a 60-va transformer. See indoor unit data.

Use Carrier accessory indoor thermostat with

subbase, Table 3.

START-UP

The 38QF unit is equipped with a crankcase heater. It is recommended that heater be energized a minimum of 24 hours before starting unit. To ener

gize heater only, turn the thermostat to OFF posi tion and close electrical disconnect to heat pump.

Heat Anticipator Settings for Room Thermo

stat (HH07AT171) — Set anticipator settings for

room thermostat according to Table 5. These set tings may be changed slightly to provide a greater degree of comfort for a particular installation.

Max Fuse or

HACR Type

Ckt Bkr Amps**

25 14.6 30

40 35 22.0 45

45 60

MCA

17.3

23.1

26.0

28.1

37.5

1 PHASE

CONN. TO -

DISCONNECT PE.R NEC

.<1

_______

Field '.Virinq

_______

Fditory Wiiinq

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

Splicii Cfjnnpctions

GROUND _EAD-|(^ GROUNDING LUG

-BLK

I-PHASE rCND UNIT

Fig. 4 — Line Power Connections

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

Table 5 — Thermostat Anticipator Settings

UNIT

38QF

018

024 030 036 042 048 060

FIRST-

STAGE

ANTICIPATOR

SETTING

Fixed

INDOOR UNIT WITH ELECTRIC

HEATER

40AQ Fan Coil

with 40AQ Htrs

or 40QB/QH Fan Coil

with 40QB Htrs

HTR

5.0

7.5

10.0

15.0

20.0

25.0

30.0

34.0

ANTICIPATOR

SETTINGS

SECOND-

STAGE

.25

.50

.75

THERMOSTAT

SUBBASE

HH93AZI73

OR HH93AZI75

40AQ.40FQ OR 40QB FAN COIL 38QF

COOLING CONTROL KIT TERM INAL

TERMINAL BOARD BOARD

THERMOSTAT

SUBBASE

HH93AZI73

OR HH93AZI75

40AQ,40FQ OR 40QB

ELECTRIC HEATER TERMINAL BOARD

38QF

TERMINAL

BOARD

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

COOLING AND ONE-STAGE HEATING

THERMOSTAT

SUBBASE

HH93AZ173

(38QF WITH 40AQ, 40QB/QH OR 40FS/28VQ

SUPPLEMENTAL HEAT, NO OUTDOOR THERMOSTATS)

40AQ,40FQ OR 40QB

ELECTRIC HEATER

TERMINAL BOARD

COOLING AND TWO-STAGE HEATING

EQUIPPED WITH ELECTRIC HEATER;

38QF

TERMINAL

BOARD

EQUIPPED WITH ELECTRIC HEATER;

SUPPLEMENTAL HEAT, ONE OUTDOOR THERMOSTAT)

THERMOSTAT

SUBBASE

COOLING AND TWO-STAGE HEATING

EQUIPPED WITH ELECTRIC HEATER;

SUPPLEMENTAL HEAT, TWO OUTDOOR THERMOSTATS)

40AQ,40FQ OR 40QB ELECTRIC HEATER

(38QF WITH 40FS/28VQ

38QF

TERMINAL

SHR — Supplemental Heat Relay ODT — Outdoor Thermostat _______

_______

Factory Wiring

Field Wiring

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

Fig. 5 — Control Circuit Connections

Accessory Outdoor Thermostat provides adjust

able outdoor control of accessory electric heater. This thermostat makes contact when a drop in out door temperature occurs. It energizes a stage of elec tric heat when the outdoor temperature setting is reached, provided the room thermostat is on the second stage of heating. One outdoor thermostat is recommended for each stage of electric heat after the first stage. Set the outdoor thermostat(s) progres

sively lower for each stage. Refer to heat load of building and unit capacity to determine the correct outdoor thermostat settings.

The accessory supplemental heat relay is required when 2 outdoor thermostats are used. It is auto matically energized by the manually operated sup plemental heat switch in the indoor thermostat subbase. The thermostat locks out compressor and the relay bypasses the outdoor thermostats for electric heater operation during heat pump shut

down. When one outdoor thermostat is used a supplemental heat relay is not required. The sup plemental heat switch in the indoor thermostat subbase bypasses outdoor thermostat, locks out compressor and activates electric heater.

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