Carrier 38CQ User Manual

0 (0)

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

(BOTH SIDES)

i'-0"(B0TH SIDES)

 

LIQUID LINE VALVE

ra SPACE REQ'D FOR SERVICE

 

^ AIRFLOW

Certified dimension drawings are available on request

Fig. 1 — Dimensions and Connections (Table 1)

Table 1 — Installation Data (Fig. 1)

UNIT 38CQ

 

; 015 1 Ò20

027

 

033

 

039

 

044

048

 

 

OPER WT (lb)

TÌ45 j_160

166

 

180

 

210

212

220

 

 

UNIT DIM. (ft-in.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Length

A

 

 

 

 

 

 

 

2-10V4

 

 

 

 

 

 

Width

B

 

 

 

 

 

 

1-10

 

 

 

 

 

 

 

 

Height

C

 

 

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

REFRIG CONN (in.)

 

Compatible Fitting (Suet) & Flare (Liq)

 

 

 

 

 

 

Suction* (ODF)

 

 

 

Ys I % I

 

 

 

%

 

%

 

 

 

 

 

 

Liquid* (ODF)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

‘Recommended field supplied refrigerant line sizes

 

 

 

 

 

 

 

 

 

 

 

UNIT 38CQ

 

 

 

015

 

020 [027

 

 

033

 

039

044t

048t

 

 

SUCTION (in. ODF)

 

 

5/

 

Vs 1 ^4

 

 

%

 

V

 

FZ 1

IVB

 

 

 

 

78

 

 

 

 

78

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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'^^ (bleedtype expansion device).

Table 2 — Carrier Approved 38CQ System Data

 

 

 

INDOOR UNIT

j HEIGHT (ft)

OUT­

REFRIG­

 

 

Accu-

IIndoor Unit

DOOR

 

 

ERANT

 

 

Rafer

 

UNIT

Fan

Coi

Piston ; Above 1 Be low

 

 

 

 

 

.

Outdoor Unit

 

 

 

 

 

^ .38CQQ15

 

4gAQpi8

II

 

38CQ020

 

^^^40AQ024

2

 

38CQ027

 

40AQ024*

4*

 

 

40AQ030

4 .

 

 

 

 

 

 

40AQ030*

*

 

 

 

40AQ036^_

6

 

38CQ033

 

.. 6

 

 

 

22

40FSJI60|28MQ036

. 6

50

50

 

 

40AQ036*

.. .Tt...

 

 

 

 

 

38CQ039

 

40FS160

28MQ036'

. If .

 

 

 

 

 

4ÒFSÌ60 '28MQ042

 

 

 

 

38CQ044

 

40FS160

28MQ042*

 

 

 

 

 

40FS200

28MQg48^

 

7

 

 

 

 

 

 

 

 

38CQ048

 

40FS200

28MQ048''

 

8*

 

 

‘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)

 

 

 

 

 

 

(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

Table 3 — Accessories

PART NO.

38CQ900081

38C 0900111

38CQ900182

38GS900381

38CQ900061

38CQ900091

38RQ900001

38RQ900021

1HH22AG110

38CQ900141

DESCRIPTION

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

Solid State Time Guard (24 volt)

TUBING

TUBING

Length

 

Liquid

 

Suction*

 

 

 

 

 

 

 

 

 

 

 

UNIT

PACKAGE

(ft)

OD

 

1 ube End

OD

1 ube bnd

 

 

OD (in.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(in.)

 

OD (in.)

(in.)

Evap

 

Cond

 

38GC900031

10

%

 

%

Va

V4t

 

 

Va

 

38GC900041

18

%

 

Va

Va

V4t

 

 

Va

 

38GS900221

25

%

 

Va

Va

V4t

 

 

Va

38CQ015,020

38GC900061

35

Ha

 

Va

Va

V4Î

 

 

Va

 

38GC900191

50

V4 ___

 

Va

Va

V4t

 

 

V

 

 

 

 

4

 

38GC900071

10

V

 

Va

4

V4

 

 

y

 

 

 

 

 

4

 

38GC900081

18

V

 

4

V4

V4

 

 

y

 

 

 

 

 

4

 

38GC900091

25

4

 

V

V4

V

 

 

y

38CQ027,033

 

4

4

 

 

4

 

38GC900101

35

V

 

Va

V

V4

 

 

y

 

4

 

4

 

 

4

 

38GC900m

50

V

 

Va

V4

V4

 

 

y

 

4

 

 

 

4

 

38CQ900001

18

V

 

V

Vat

V

 

 

y

 

4

 

4

4

 

 

4

 

38CQ9000n

25

4

 

Va

Vai

4

 

 

4

38CQ039,044,048

38CQ900021

35

V

 

Va

 

V4

 

 

V4

 

4

 

 

 

 

 

 

 

 

38CQ900031

50

V

 

Va

Vai

V4

 

 

4

 

4

 

 

 

 

*Suction line is insulated and has a 90 bend at one end

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

fFor 5/8-in evaporator connection, cut off 3/4-in end

 

 

on 38CQ044.048

 

 

 

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.)

1. Remove locking nut, rubber 0-ring and

Schrader core from valve. 2. Cut tubing to correct length.

3.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.

4.Replace Schrader core.

5.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)

 

 

 

 

 

 

 

 

 

 

 

 

BRANCH CIRCUIT

 

 

 

 

 

 

 

OPER

 

COMPR

FAN

 

Power

Max

 

Gnd

 

Max

UNIT

 

V/PH

 

VOLTAGE*

 

Wire

 

Wire

 

 

 

 

 

FLA

 

Ft

 

 

Fuse

 

 

 

 

 

 

 

 

 

 

Size

 

Sizef

 

 

 

 

 

Max

 

Min

LRA

RLA

 

 

(AWG)

Wire

 

(AWG)

Ampsi

 

 

 

 

 

 

 

 

 

 

 

 

 

38CQ015

 

 

 

 

 

 

41

9.0

.9

 

14

31

 

14

 

20

 

 

38CQ020

 

 

 

 

 

 

65

10.3

.9

 

12

40

 

12

 

20

 

 

38CQ027

 

 

 

 

 

 

82

17.7

2.4

 

10

42

 

10

 

40

 

 

38CQ033

 

230/1

 

254

 

207

88

19.8

2.4

 

10

36

 

10

 

45

 

 

38CQ039

 

 

 

94

22.2

2.4

 

10

33

 

10

 

50

 

 

 

 

 

 

 

 

 

 

 

 

 

38CQ044

 

 

 

 

 

 

106

25.0

2.4

 

8

46

 

8

 

50

 

 

38CQ048

 

 

 

 

 

 

106

25.0

3.0

 

8

46

 

8

 

50

 

 

38CQ033

 

200/

 

254

 

180

87

13.0/

2.0/

 

12

40

 

12

 

30/

 

 

 

230/3

 

 

11.5

2.0

 

 

 

25

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

38CQ039

 

 

 

 

 

 

79

17.4

2.4

 

12

31

 

12

 

40

 

 

38CQ044

 

200/3

 

229

 

180

87

18.6

2.4

 

10

35

 

10

 

40

 

 

38CQ048

 

 

 

 

 

 

87

18.6

3.0

 

10

35

 

10

 

40

 

 

38CQ039

 

 

 

 

 

 

67

15.0

2.4

 

12

41

 

12

 

35

 

 

38CQ044

 

230/3

 

254

 

207

70

16.7

2.4

 

12

36

 

12

 

35

 

 

38CQ048

 

 

 

 

 

 

70

16.7

3.0

 

12

36

 

12

 

35

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

V

FLA — Full Load Amps

 

 

 

 

 

 

 

NOTES:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LRA — Locked Rotor Amps

 

 

 

 

 

1 Fan motors are 200-v or 230-v, single phase

 

 

 

RLA — Rated Load Amps

 

 

 

 

 

2 All units

have 24-v control

circuit which requires

external

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

 

 

power source

 

 

 

 

 

 

 

operate satisfactorily

 

 

 

 

 

 

 

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

fRequired when using nonmetallic conduit

 

 

 

 

 

aluminum

wire only

Use latest

National Electrical

Code for

^Maximum dual element fuse size

 

 

 

 

 

wire sizing

 

 

 

 

 

 

 

 

THERMOSTAT

40AQ FAN COIL

38CQ

THERMOSTAT

40AQ OR 40FQ

38CQ

SUBBASE

COOLING CONTROL KIT

TERMINAL

SUBBASE

ELECTRIC HEATER

TERMINAL

HH93AZ073 OR

TERMINAL BOARD

BOARD

HH93AZ0730R

TERMINAL BOARD

BOARD

HH93AZ075

 

 

HH93AZ075

 

 

f

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

EQUIPPED WITH ELECTRIC HEATER; EMERGENCY HEAT, ONE OUTDOOR THERMOSTAT)

THERMOSTAT

40AQ OR 40FQ

38CQ

THERMOSTAT

40AQ OR 40FQ

38CQ

SUBBASE

ELECTRIC HEATER

TERMINAL

SUBBASE

ELECTRIC HEATER

TERMINAL

HH93AZ073 OR

TERMINAL BOARD

BOARD

HH93AZ073 OR

TERMINAL BOARD

BOARD

HH93AZ075

 

 

HH93AZ075

 

 

COOLING AND TWO-STAGE HEATING

(38CQ WITH 40AQ OR 40FS/28MQ EQUIPPED WITH ELECTRIC HEATER;

EMERGENCY HEAT, NO OUTDOOR THERMOSTATS)

COOLING AND TWO-STAGE HEATING

(38CQ WITH 40FS/28MQ

EQUIPPED WITH ELECTRIC HEATER;

EMERGENCY HEAT, TWO OUTDOOR THERMOSTATS)

B

EHR — Emergency Heat Relay

ODT — Outdoor Thermostat

_______ Factory Wiring

_______ Field Wiring

*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

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.

 

_________

BLK-

3-PHASE

 

BLK-

 

 

CONN. TO

I-PHASE

 

FUSED

 

DISCONNECT

CONN. TO

YEL OR BLK------

 

FUSED

 

 

 

DISCONNECT

 

L

------------ GROUND LUG

 

38CQ HEAT PUMP

 

CONTROL BOX

Fig. 7 — Line Power Connections

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

 

FIRST-

INDOOR

 

SECOND-

UNIT

STAGE

UNIT WITH

HTR

STAGE

38CQ

ANTICIPATOR

ELECTRIC

KW

ANTICIPATOR

 

SETTING

HEATER

 

SETTINGS

 

 

 

 

 

015

 

 

5 0

 

020

 

40AQ Fan-Coil

7 5

16

027

 

10 0

 

 

with 40AQ Htrs

 

 

033

 

15 0

 

Fixed

 

 

039

40FS/28MQ

20 0

33

 

044

 

with 40FQ

25 0

 

048

 

Htrs

30 0

49

 

 

 

 

34 0

 

 

 

 

 

 

 

 

 

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

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.

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 V 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.

Loading...
+ 14 hidden pages