Carrier 38CQ User Manual

Carrier Parkway • Syracuse, N Y 13221

Heat Pump - Outdoor Section

4'0" OVERHEAD SPACE REQ'D FOR SERVICE AND AIRFLOW

0 AIRFLOW

CLEARANCE

LIQUID LINE CONN

LIQUID LINE VALVE

Certified dimension drawings are available on request

i'-0"(B0TH SIDES)

ra SPACE REQ'D FOR SERVICE

^ AIRFLOW

(BOTH SIDES)

Fig. 1 — Dimensions and Connections (Table 1)

Table 1 — Installation Data (Fig. 1)

UNIT 38CQ OPER WT (lb) UNIT DIM. (ft-in.)

Length A Width B Height C

REFRIG CONN (in.)

Suction* (ODF)

Liquid* (ODF)

‘Recommended field supplied refrigerant line sizes

UNIT 38CQ 015 SUCTION (in. ODF) LIQUID (in. ODF)

tMay use 7/8-in accy tubing package (slight capacity loss) See p 3 NOTES: 1 Maximum length of interconnecting tubing is 50 feet

2 Units 38CQ044, 048 factory supplied with 3/4 to 1-1/8 in suc

tion valve adapter (field installed) for field-supplied 1-1/8 in suction line

; 015 1 Ò20

TÌ45 j_160

I -4^1 -4% 11 -4Vs[ 2-0)41 2-0yB|2-0VB 12-6Vs

Compatible Fitting (Suet) & Flare (Liq)

027

033

166 180

2-10V4

1-10

039

210

048

044

212 220

Ys I % I %

020 [027 033

Vs 1 ^4

039

044t 048t

fZ 1

IVb

INSTALLER'S PRELIMINARY SURVEY

Step 1 — Unpackage Unit — Move heat pump to

final location. Open carton at end marked “compressor end.” Slide unit from carton taking special care to not damage service valves or grilles.

Step 2 — Inspect Equipment — File claim with

shipping company if shipment is damaged or incomplete.

Step 3 — Complete or Consider the Following

before installing the 38CQ unit.

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

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

Make provisions for condensate drainage and defrost water disposal whether unit is installed on ground or roof. (Make sure unit base pan drainage holes are not blocked.) See Mounting Pad for details. Roof installation method for 38CQ depends on building construction and special re quirements of local codes. Roof must be capable of supporting unit weight. Maximum allowable ver tical distance between indoor and outdoor sections is 50 feet. See Table 2.

Use an indoor coil with a bleed-type expansion device. (See Table 2 for Carrier approved indoor sections.) If coil does not have a bleed-type expansion device, it may be necessary to add an accessory start capacitor and relay to heat pump. This would require removing compressor start thermistor (PTC device) on units so equipped. It is

recommended that 38CQ units be used with Carrier approved indoor sections, all of which are equipped with a bypass type AccuRater'^^ (bleed-

type expansion device).

Table 2 — Carrier Approved 38CQ System Data

INDOOR UNIT OUT DOOR

UNIT

^ .38CQQ15

38CQ020

38CQ027

38CQ033

38CQ039

38CQ044

38CQ048

‘Indoor units that require replacement of AccuRater refrigerant

control piston for optimum performance when used with specified outdoor unit The 38CQ048 is factory supplied with no 8 piston for indoor unit (28MQ048)

REFRIG

ERANT

Fan

Coi

4gAQpi8

^^^40AQ024

40AQ024* 40AQ030 40AQ030*

40AQ036^_

40FSJI60|28MQ036

40AQ036* 40FS160 4ÒFSÌ60 40FS160 40FS200

40FS200

28MQ036'

'28MQ042

28MQ042*

28MQg48^

28MQ048''

AccuRafer Piston

.. 6

. 6 .. .Tt...

j HEIGHT (ft)

; Above 1 Be low

4 .

. If .

Indoor Unit

Outdoor Unit

50 50

(g) Carrier Corporation 1977

38CQ400105 B

Form 38CQ-6SI

MOUIMTirJtTP^

Step 4 — On the Ground: Mount Unit on a Solid,

Level Concrete Pad. See Fig. 2 for pad dimensions.

Position unit so that coil drainage holes in base pan overhang the pad. Make sure pad does not obstruct drainage holes (holes drain water during heating and defrost cycles). Unit can be attached to pad

with mastic adhesive or by drilling holes in base

pan for 1/4-in. mounting bolts.

Construct pad a minimum of 6-in. thick to provide clearance under holes for drainage and ice buildup. In areas where prolonged subfreezing temperature or heavy snows occur; increase clear ance to 12 to 18 in. by constructing an angle iron frame to support unit 12 to 18 in. off concrete base. Cross angle of frame must not obstruct coil drainage holes. See Fig. 3 for recommended frame construction. Extend a 12-in. gravel apron around pad for condensate and defrost water drainage field.

Step 5 — On the Roof: Mount Unit on a Level Platform or Frame: Unit must be elevated for

proper clearance as described under ground in stallation above. Roof design and water drainage must be planned to prevent unit from setting in water. Flash all roof openings to prevent leaks.

«AtMtAK'tMV.VA'Kry.-

mtm

Fig. 3 — Heat Pump Mounting Frame

PART NO.

38CQ900081

38C 0900111 38CQ900182

38GS900381 38CQ900061 38CQ900091

38RQ900001

38RQ900021

1hH22AG110

Low-Voltage Control — Honeywell Thermostat HH07AT071 and Thermostat Subbase HH93AZ073 — (Automatic Changeover)

Low-Voltage Control — Honeywell Thermostat HH07AT071 and

Thermostat Subbase HH93AZ075 — (Manual Changeover) Service Sentry (Six HN65CT002) Start Capacitor and Relay Package

Flare (3/8-in.) to Compatible (3/8-in.) Couplings (Two-Pack)

Liquid Line Filter-Drier

Emergency Heat Relay (Required with 2 outdoor thermostats.) (Service Parts)

Outdoor Thermostat (Six 38RQ900032)

Optimizer Control

38CQ900141 Solid State Time Guard (24 volt)

TUBING

PACKAGE

Length

(ft) OD 1 ube End

Liquid

(in.) OD (in.)

38GC900031 38GC900041 38GS900221

38GC900061 35

38GC900191

38GC900071 10

38GC900081

38GC900091 25

38GC900101 35

38GC900m

38CQ900001

38CQ9000n 25 38CQ900021 35 38CQ900031

*Suction line is insulated and has a 90 bend at one end fFor 5/8-in evaporator connection, cut off 3/4-in end

10 18

% % % %

50 18

V V

4 4

___

Table 3 — Accessories

DESCRIPTION

TUBING

Va Va

Va 4

Va Va

Va Va Va

ICapacity reduction may occur when 7/8-in accessory tubing is used

on 38CQ044.048

____

Suction*

(in.)

Va V4t Va Va

Va V4t Va Va V4Î Va Va V4t

1 ube bnd

OD (in.)

Evap

V4t

V4 V4

Vat Vai

4 4

Vai

Cond

UNIT

38CQ015,020

38CQ027,033

38CQ039,044,048

PIPING CONNECTIONS

The 38CQ units can be connected to indoor units using Carrier accessory tubing package or field-supplied tubing of refrigerant grade. See Table 1 (with notes) for unit piping connection type, size and line size recommendations and Table 3 for accessory tubing sizes. Maximum

length of refrigerant piping allowed is 50 feet

A capacity reduction will result if accessory tubing is used in 38CQ044,048 systems. For example, when a 25-ft, 7/8-in. accessory tubing package is used, there will be a capacity reduction

of 1-1/2%. For maximum capacity, use 1-1/8 in. suction line as recommended in Table 1.

When other than 25 ft of interconnecting

piping is used, follow special requirements de scribed in Refrigerant Charging. Do not use less than 10 ft of accessory liquid line. Do not cut

5/16-in. or 1/4-in. liquid line. 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.

To assure noise-free installation, isolate refrig erant lines from ductwork and framing or where they run thru stud spaces, enclosed ceilings or pipe chases. Use isolation hangers (Fig. 4), as rigid fastening may transmit pulsations to structure,

creating an objectionable rumble. Do not attach

liquid line to uninsulated suction line. When

running thru structure, surround all lines with 1-in. insulation to prevent transmission of vibration.

Before Connecting Refrigerant Lines, replace the

AccuRater'^'''^ refrigerant control piston in the indoor coil as required. See Table 2. The 38CQ048 is

factory supplied with a No. 8 AccuRater piston for installation in 28MQ048. For piston replacement instructions, see AccuRater’’"''^ Servicing on page 15.

Step 6 — 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. (Do not disassemble AccuRater.) Unit Compatible Fitting permits mechanical (quick-connect) or sweat connection as described below. It is not necessary to flare system liquid line if an accessory flare to Compatible Fitting coupler is used for liquid line connection. See Accessory Coupler (Fig. 5).

38CQ044,048 UNITS - When using 1-1/8 in. field-supplied suction line, remove suction line adapter taped to compressor suction line. Sweat connect refrigerant suction line to 1-1/8 in. end of

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

When a 7/8-in. field-supplied suction line is

used on 38CQ039, a field-supplied 3/4-in. to

7/8-in. suction line adapter must be provided (not required if 38CQ accessory tubing is used). 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 tubing.)

Remove locking nut,

rubber 0-ring and

Schrader core from valve.

Cut tubing to correct length.

Insert tube in Compatible Fitting. Wrap top and bottom of service valves in wet cloth to prevent damage by heat. Solder with low temperature (450 F) silver alloy solder.

Replace Schrader core.

Evacuate or purge system with field-supplied refrigerant.

ACCESSORY FLARE TO COMPATIBLE COU PLER is shown in Fig. 5. Attach flare nut on coupler to flare fitting on unit liquid service valve. Connect liquid line to Compatible Fitting using mechanical or sweat connection. When mechanical connection is made, use 2 wrenches when tighten ing Compatible Fitting nut — one to hold coupler and one to tighten nut. Liquid line must be flared if coupler is not used.

Fig. 5 — Accessory Coupler

ELECTRICAL DATA AND WIRING

Field wiring must comply with local and national fire, safety and electrical codes. Voltage to unit must be within ± 10% of voltage indicated on

Table 4 — Electrical Data (60-Hz)

OPER

UNIT V/PH

38CQ015 41 38CQ020 65 10.3

38CQ027 82 38CQ033 38CQ039

38CQ044

38CQ048 106

38CQ033 38CQ039

38CQ044 38CQ048

38CQ039 38CQ044 38CQ048

FLA — Full Load Amps LRA — Locked Rotor Amps RLA — Rated Load Amps

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

operate satisfactorily

fRequired when using nonmetallic conduit

^Maximum dual element fuse size

230/1 254 207

200/ 230/3

200/3

230/3

VOLTAGE*

Max Min

254 180 87

229 180 87 18.6

254

207 70

COMPR

LRA

88 19.8 2.4 10 36 94

106

79 17.4

87 18.6 67

BRANCH CIRCUIT

FAN FLA

RLA

9.0

17.7 2.4 10 42

22.2

25.0

13.0/

11.5

15.0

16.7

.9 14 31

.9 12 40 12

2.4 10 33

2.4

3.0

2.0/

2.0

2.4 12 31

2.4 10 35

3.0 10 35

2.4 12

3.0 12

NOTES: 1 Fan motors are 200-v or 230-v, single phase 2 All units have 24-v control circuit which requires external

power source

3 Copper wire sizes based on 60 C Use copper or copper-clad

aluminum wire only Use latest National Electrical Code for

wire sizing

Power

Wire

Size

(AWG)

8 46 8

Max

Wire

46 8

40 12

41 12

36 12 35

Gnd Wire Sizef

(AWG)

14 20

10 10 10 50

8 50

12 40 10 40 10 40

Max

Fuse

Ampsi

20 40 45

30/

35 35

THERMOSTAT

SUBBASE

HH93AZ073 OR

HH93AZ075

40AQ FAN COIL

COOLING CONTROL KIT

TERMINAL BOARD

38CQ

TERMINAL

BOARD

THERMOSTAT

SUBBASE

HH93AZ0730R

HH93AZ075

(38CX) WITH 40AQ OR 40FS/28MQ

EQUIPPED WITH ELECTRIC HEATER;

EMERGENCY HEAT, ONE OUTDOOR THERMOSTAT)

40AQ OR 40FQ

ELECTRIC HEATER

TERMINAL BOARD

38CQ

TERMINAL

BOARD

THERMOSTAT

SUBBASE

HH93AZ073 OR

HH93AZ075

COOLING AND TWO-STAGE HEATING

(38CQ WITH 40AQ OR 40FS/28MQ

EMERGENCY HEAT, NO OUTDOOR THERMOSTATS)

EQUIPPED WITH ELECTRIC HEATER;

40AQ OR 40FQ

ELECTRIC HEATER

TERMINAL BOARD

EHR — Emergency Heat Relay ODT — Outdoor Thermostat

_______

Factory Wiring

_______

Field Wiring

38CQ

TERMINAL

BOARD

THERMOSTAT

SUBBASE

HH93AZ073 OR

HH93AZ075

COOLING AND TWO-STAGE HEATING EQUIPPED WITH ELECTRIC HEATER;

EMERGENCY HEAT, TWO OUTDOOR THERMOSTATS)

*Transformer (60 va) located in cooling control kit or electric heater

fTerminal L is identified as terminal X on some former thermostats

(Required for accessory Service Sentry)

:|;Remove factory-installed jumpers (connection B) when installing

outdoor thermostats (ODT)

Fig. 6 — Control Circuit Connections

40AQ OR 40FQ

ELECTRIC HEATER

TERMINAL BOARD

(38CQ WITH 40FS/28MQ

38CQ

TERMINAL

BOARD

nameplate. On 3'-phase units, phases must be balanced within 2%. Contact local power company for correction of improper line voltage.

When making electrical connections, provide

clearance at unit for refrigerant piping connections.

See Table 4 for recommended wire and fuse sizes.

Step 7 — Install a Branch Circuit Fused Disconnect

of adequate size to handle unit starting current. Provide a separate fused 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 of

and readily accessible from the unit, per section

440-14 of National Electrical Code (NEC).

Step 8 — Bring Line Power Leads Into Unit —

Extend leads from fused disconnect thru hole provided in service embossment (Fig. 1) and thru

7/8-in. hole into control box.

Step 9 — Connect Ground Lead to a Ground Lug in Control Box for safety. Connect power wiring.

See Fig. 7. Splice line power leads to yellow and black pigtails on single-phase units or to black pigtails (3) on 3-phase unit. Use wire nuts supplied with unit. Tape each connection.

Step 10 — 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.

Step 11 — Control Power Wiring (24 v) is brought

thru hole in unit service embossment. Fig. 1. Connect leads to control wiring terminal board (located on outside of control box) as shown in Fig. 6.

3-PHASE CONN. TO FUSED DISCONNECT

I-PHASE

CONN. TO FUSED DISCONNECT

_________

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

BLK-

GROUND LUG

38CQ HEAT PUMP

CONTROL BOX

Fig. 7 — Line Power Connections

BLK-

YEL OR BLK

------

emergency 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, an emergency heat relay is not required. The emer gency heat switch in the indoor thermostat subbase bypasses outdoor thermostat, locks out compressor and activates electric heater. See 40FS Indoor Unit and Electric Heater Installation, Start-Up and

Service Instructions for installation of emergency

heat relay.

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 60-va transformer. See indoor unit data.

Use Carrier accessory indoor thermostat HH07AT071 with HH93AZ073 or HH93AZ075 subbase.

IWITIAL START-UP

The 38CQ unit is equipped with a crankcase heater. It is recommended that heater be energized a minimum of 24 hours before starting unit. To energize heater only, turn the thermostat to OFF position and close electrical disconnect to heat pump.

Heat Anticipator Settings for Room Thermostat

(HH07AT071) — Set anticipator settings for room thermostat according to Table 5. These settings may be changed slightly to provide a greater degree of comfort for a particular installation.

Table 5 — Thermostat Anticipator Settings

UNIT 38CQ

015 020 027 033 039 044

048

FIRST-

STAGE

ANTICIPATOR

SETTING

Fixed

INDOOR

UNIT WITH

ELECTRIC

HEATER

40AQ Fan-Coil with 40AQ Htrs

40FS/28MQ

with 40FQ

Htrs

HTR

5 0 7 5

10 0

15 0

20 0 25 0

30 0 34 0

second-

stage

ANTICIPATOR

SETTINGS

Accessory Outdoor Thermostat provides adjustable

outdoor control of accessory electric heater. This thermostat makes contact when a drop in outdoor temperature occurs. It energizes a stage of electric

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

The accessory emergency heat relay is required

when 2 outdoor thermostats are used. It is auto

matically energized by the manually operated

Accessory Outdoor Thermostat(s) Installation —

Install outdoor thermostat at a suitable location on the outside of the control box. Use any free hole to fasten thermostat bracket. Be sure that engage

ment screw does not interfere with wiring or components inside of control box Thermostat

bracket may be secured with only one screw; however, make sure that bracket is firmly attached to resist vibration forces. If a free hole is not available, drill hole in control box after assuring

that drilling will not damage any components inside of box If a second thermostat is used,

follow the procedure outlined above. If there is no available space on the control box for a second thermostat, mount the 2 thermostats together. Connect the 2 thermostats with a machine screw, lock washer and nut, and then mount assembled thermostats to the control box (See Fig. 8a).

Route the capillary and attached bulb below the control box to the upper portion of the outdoor coil grille. Carefully insert the bulb between the tube sheet and nearest vertical grille wire. Place the bulb across the grille and fasten with wire, wire ties or other suitable fastener (See Fig. 8b). Never expose bulb to direct sunlight. If necessary, shield bulb with appropriate material.

Replace access wrapper on unit. Check that

capillary is not pinched by wrapper

To Start Unit — (Make sure crankcase heater has

been energized for 24 hours.) Adjust the thermo

stat as follows:

1. Set selector switch at OFF.

2. Turn on main disconnect switch(es) to indoor and outdoor units.

3. Set fan switch as desired (ON or AUTO.).

4. Set thermostat dial at desired temperature.

5. Set selector switch at HEAT or COOL.

Check system refrigerant charge. See Refrig

erant Charging.

SERVICE

Refrigerant Charging — The 38CQ units contain

correct operating charge for complete system when connected to 40FS/28MQ or 40AQ indoor units with 25 ft of tubing of recommended diameter. Charge adjustment is required on other systems. Adjust system charge for refrigerant line lengths and diameters that differ from 25 ft and 3/8-in.

+ 14 hidden pages