Carrier 50ET User Manual

50ET.QT

HEATING A COOLING

Installation, Start-Up and Service Instructions

Heat Pump and Cooling Unit Chassis Only, Sizes 212-230

CONTENTS

SAFETY CONSIDERATIONS INTRODUCTION

INSTALLATION

Step 1 — Check Equipment and Jobsite................I

• UNPACK UNIT

• INSPECT EQUIPMENT

• INSPECT WALL SLEEVE

Step 2 — Install Chassis in Wall Sleeve...............1-3

• INSTALL ACCESSORY OUTDOOR GRILLE

• INSTALL ACCESSORY COLD CLIMATE PACKAGE IF REQUIRED

• SLIDE CHASSIS INTO SLEEVE

Step 3 — Install Accessory Thermostat and Connect Thermostat Wiring

• TO MOUNT THERMOSTAT IN UNIT

• TO MOUNT THERMOSTAT REMOTELY

Step 4 — Set Indoor Fan Motor Speed...................4

Step 5 — Install Accessory Electric Heater

If Required.................................................................4

START-UP................................................................4,5

SERVICE...................................................................5-I4

Installing and servicing air conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and qualified service personnel should install or service air conditioning equipment.

Untrained personnel can perform basic maintenance,

such as cleaning and replacing filters. All other opera tions should be performed by trained service personnel. When working on air conditioning equipment, observe precautions in 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.

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

SAFETY CONSIDERATIONS

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

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

A WARNING

Before installing or servicing unit, turn off main

power to system. There may be more than one disconnect switch. Turn off accessory heater power if applicable. Electrical shock can cause personal injury.

_________________________________________

IMPORTANT: Final wiring inspection by local

authorities must be done before chassis is installed in sleeve.

A WARNING

The Model 50ET,QT chassis is an uncased unit and,

therefore, requires special care in handling to prevent injury to installer and damage to unit. A portable lifting device must be used to move and position unit.

Be careful of sharp edges when handling chassis.

Page

1-4

3,4

Single-Package Units

INTRODUCTION

Install Model 50ET air conditioner or 50QT heat pump chassis in accessory wall sleeve. See Table 2 for part numbers. Wall sleeves are shipped separately with accom panying installation instructions. All electrical power, ductwork and condensate drain hookups are made at time of wall sleeve installation.

IMPORTANT; Carrier standard outdoor grille or

deluxe outdoor grille must be ordered separately and installed in wall sleeve before chassis is installed. Do not run unit without proper outdoor grille in place.

See Table 2 for part numbers.

INSTALLATION

Step 1 — Check Equipment and Jobsite

UNPACK UNIT — Move to final location. Lift card board carton off chassis taking special care not to damage unit.

INSPECT EQUIPMENT for damage prior to installa tion. To remove metal cover plate, remove 6 screws. File claim with shipping company if shipment is damaged or

incomplete.

Leave chassis bolted to skid and replace metal cover plate and carton until ready for installation into wall sleeve.

INSPECT WALL SLEEVE installation for damage. Condensate drain pan must be free of debris and installed in accordance with local building regulations. Electrical connector on left side of sleeve should be free of dirt, grease, paint, etc. Connector must be properly wired before chassis installation. Duct connection panel must be level and duct connections complete. Do not rest weight of ductwork on duct connector panel. Inspect nameplate on sleeve to ensure wire and fuse sizing is correct for model size and heater accessory to be installed.

NOTE: If remote thermostat location is desired, location

must be determined and field wiring must be installed

before wall completion.

Step 2 — Install Chassis in Wall Sleeve —

Remove sleeve filler panel and save screws.

INSTALL ACCESSORY OUTDOOR GRILLE — In stall outdoor grille using screws saved Refer to instruc tions shipped with outdoor grille.

INSTALL ACCESSORY COLD CLIMATE PACK

AGE IF REQUIRED — Cold climate accessory should

be installed where the outdoor ambient temperature

consistently falls below 30 F. Refer to Table 2 for correct

accessory part number. Refer to instructions packaged

with aceessory for installation.

IMPORTANT. Be sure disconnect, per NEC, installed with the wall sleeve is in OFF position before proceeding with chassis installation.

Book |1 |1 |4 |4 PC 131 Catalog No 535-078 Printed inUS A Form 50ET,QT-3SI Pgl 5-85 Replaces: 50QT-10SI

Tab Ilbl5ahal5a

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obiigations.

For replacement items use Carrier Specitied Parts

50ET,QT

HEATING A COOLING

Table 1 — Electrical Data (60 Hz)

OPER

MODEL

50ET/QT

212300

215300 208/230/1

218300

224300ft

230300ft

FLA — Full Load Amps HACR — Heating, Air Conditioning and Refrigeration IFM — Indoor Fan Motor LRA — Locked Rotor Amps MCA — Minimum Circuit Amps OFM — Outdoor Fan Motor RLA — Rated Load Amps TD — Time Delay

‘Permissible limits of the voltage range at which units will operate

satisfactorily

V/PH

208/230/1

208/230/1 254 187 50

208/230/1 254

208/230/1 254 187

VOLTS*

Max Mint LRA

254 187

254 187 43

187

CO^flPR

RLA

68 1 5

9 3

130

169

iPM

FLA

1 5 1 0

1 7 1 5

2 0

2 4 1 5

OFM

FLA

1 0

1 5

ELECTRIC

HEATER

Amps

None

9 4/12 5

5.0

18.0/20.8

None

30509 4/12 5

18 0/20 8

None

9 4/12 5

18 0/20 8

7.5

26.8/31.3

None

17 3/20 8

7 5

26 8/31 3

100

36 1/41 7

None

17 4/20 8

7 5

26 8/31 3

36.0/41.7

10.0

Single-Package Units

BRANCH CiRCUiT #1

(or Total Unit)

Max TD Fuse or

HACR CktBkr Amps**

15/15 25/30 35/40

20/20 25/30 35/40

20/20 30/35 40/45 50/60

15/15 25/30 35/40 50/60

15/15 30/30 40/40 50/60

tMinimum voltage Is 197 when outdoor ambient temperature exceeds

105 F

^iFiold wiring to be sized per NEC or local codes Use copper wire only "Maximum dual element fuse size ttThese units require 2 separate supply circuits Refer to both branch

circuit charts for complete electrical data Two-circuitfused disconnect

must be field supplied

NOTE: Dual values in this table (for example: Electric Heater Amps: 9 4/12 5) apply to 208- and 230-volt connections, respectively

MCA

110/110 22 8/26 6 33,5/37.0

13 4/13 4 25 1/29 0 35 9/39.4

14 8/14 8 26 6/30 5 37 3/40 8

48.3/54.0 2 5/25

24 1/28 5 36 0/41 6 47 6/54 6

3 0/30

24 8/29 0 36 5/42 1

48.0/55.1

BRANCH CiRCUiT #2

(When Used)t

Max TO Fuse or

HACR CktBkr Amps**

—

25/25 25/25 25/25 25/25

35/35 35/35 35/35 35/35

MCA

—

17 9/17 9 17 9/17 9 17 9/17 9

17.9/17 9 25/25

25/25 25/25 25/25

Table 2 — Accessories

PART NO.

500T902061 \A/all Sleeve (one)

50QT900081 Wall Sleeve (one)

50QT90301106 500T90302106 Architectural Grille (six) All

S0QT90400102 50QT90401102

50QT90700106 Fresh Air Damper (six)

50QT905001

99TZ900321/ 99TZ900361* 99TZ900321/ 99TZ900391*

99TZ900291* 99TZ900401* 99TZ900511* 99TZ900501* Electronic, 7-Day Programmable 99TZ900541t

50QT901000 50QT901010 50QT901020 SOQT901030 50QT901040 50QT901050 500T901060 50QT901070 50QT901080

'For remote mounting only tSuitable for mounting on unit chassis

Standard Aluminum Grille (six) All

Polymer Front Cover (two)

Cold Climate Package (one) All

Cooling Thermostats:

Automatic Changeover All Manual Changeover All

Heat Pump Thermostats:

Two-Stage Heat, One-Stage Cool Manual Changeover

Automatic Changeover Manual Changeover All

Manual Changeover

Electric Heaters (kW)

DESCRiPTiON MODEL 50ET.QT

3 5

75 218 5 7 5 224

5 7 5

212, 215, 218

224, 230

212, 215, 218

224, 230

212, 215, 218 212, 215, 218

All

224 224

230 230 230

SLIDE CHASSIS INTO SLEEVE — Chassis is heavy. Portable lifting device must be used. Exercise caution to be sure forks do not damage chassis components (such

Fig. 1 — Chassis with Accessory Indoor

Polymer Wrapper

as drain connections) while lifting and installing. Guide chassis into sleeve on indoor side by first placing chassis guide channels onto lower corners of sleeve. Slide chassis into sleeve until center partition perimeter meets gasket provided around outer edge of sleeve. Check electrical plugs for alignment as chassis is slid into place.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obiigations.

Bookll II 14 14 PC 131 Catalog No 535-078 Printed in U S A Form 50ET.QT-3SI Pg2 5-85 Replaces: 50QT-10SI Tab 1b 5al1a|5a For replacement items use Carrier Specilied Parts

Do not release chassis until installed and bolted completely into sleeve as it may fall out without warning.

A WARNING

50ET,QT

HEATING A C001.ING

OUTDOOR FAN ORIFICE

REVERSING VALVE

COMPRESSOR CRANKCASE HEATER THERMOSTAT

CRANKCASE HEATER

«-OUTDOOR

ÌÌÌ COIL

DEFROST THERMOSTAT (NOT VISIBLE)

CHASSIS GUIDE CHANNEL

50QT212.215 (shown), 218

Fig. 2 — Outdoor Component Location

Tighten chassis into place by driving 6 lag bolts, pro vided in separate bag with chassis into nuts provided on sleeve (see Fig. 3).

Electrical and condensate drain connections are com

plete when chassis is installed correctly into sleeve.

A CAUTION

Tighten lag bolts uniformly. Failure to do so may cause misalignment and poor electrical connection.

ACCURATER'^“ DEVICE LOCATION

MAIN CONTROL BOX COVER

ELECTRIC HEATER COMPARTMENT

INDOOR BLOWER AND MOTOR ASSEMBLY

COMPRESSOR

SUCTION PRESSURE PORT

LOCATION

Single-Package Units

OUTDOOR FAN MOTOR (PROPELLER FAN AND GUARD REMOVED)

OUTDOOR FAN ORIFICE

COMPRESSOR

MOUNTING

PAN

50QT224 (Shown), 230

Step 3 — Install Accessory Thermostat and Connect Thermostat Wiring — Accessory thermo

stat can be installed on the 50ET,QT chassis or in a remote location.

TO MOUNT THERMOSTAT IN UNIT-

1. Remove metal cover plate by removing 6 screws.

2. Locate and install subbase onto thermostat bracket running between right and left coil partition (see Fig. 3). Push field-supplied thermostat wires through hole provided.

SLEEVE JUNCTION BOX ACCESS PLATE

CONTROL BOX (SLIDES OUT FOR SERVICE)

CHASSIS MOUNTING BOLTS (6)

INDOOR

ACCESSORY ELECTRIC HEATER

LOW-PRESSURE SWITCH

DEFROST THERMOSTAT

COMPRESSOR SUCTION SERVICE PORT (NOT VISIBLE)

CENTER

PARTITION

INDOOR CONDENSATE

DRAIN

50QT224,230

INDOOR NAMEPLATE

INDOOR AIR FILTER

50QT212,215,218

THERMOSTAT

MOUNTING

BRACKET

Fig. 3 — Indoor Component Location

Book|1 II 14 14 PC131 Catalog No 535-078 PrintedinUSA Form 50ET,QT~3SI Pg3 5-85 Replaces; 50QT-10SI

- • For replacement Hems use Carrier Specilled Parts.

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

INDOOR AIR FILTER LOCATION (NOT SHOWN)

LEFT COIL PARTITION

THERMOSTAT MOUNTING BRACKET

50ET,QT

HEATING A COOLING

(5>

S>]

(5>

THERMOSTAT AND SUBBASE (SEE BELOW)

THERMOSTAT

99TZ900321 99TZ900361 99TZ900321

COOLING UNIT WITH ELECTRIC HEAT HEAT PUMP WITH SUPPLEMENTAL ELECTRIC HEAT

JM.

WIRES FROM

JZL

UNIT CONTROL BOX

_0_

SUBBASE

99TZ900391

Fig. 4 — Thermostat Connection Diagrams — 50ET,QT

Single-Package Units

UNIT CONTROL BOX WIRING TERMINAL BOARD

THERMOSTAT/SUBBASE

99TZ900291 99TZ900401 99TZ900511 99TZ900541

3. Route thermostat wires through hole located on left coil partition and up to low-voltage wire entrance hole on control box front cover.

4. Remove 2 screws and slide control box to expose low-voltage terminals. Attach wires to appropriate terminals as shown on unit wiring diagram. See Fig. 4.

5. Attach thermostat to subbase and snap on thermostat cover.

6. Cut and remove insulation from hole in metal cover plate.

7. Replace metal cover plate.

8. Install accessory polymer front cover as described in instructions shipped with accessory cover. Cut

rectangular hole for thermostat as indicated by mark

in back of cover.

TO MOUNT THERMOSTAT REMOTELY-

1. Pull field-supplied thermostat wires previously installed up into wire entrance hole on control box front cover and connect wires as described in Step 3, paragraph 4, above.

2. Connect other ends of thermostat wires, hanging from the wall at their remote location, securely into subbase at appropriate terminals specified in unit wiring diagram. See Fig. 4.

3 Mount subbase onto wall.

4. Attach thermostat to subbase. Snap on cover and

install chassis indoor cover.

Step 4 — Set Indoor Fan Motor Speed — All units are factory wired for low fan speed. Higherexternal static pressure requirements can be met by wiring motor for higher fan speed. See Table 3.

Step 5 — Install Accessory Electric Heater,

If Required — Refer to instructions packaged with

accessory heater. See Table 2 for part numbers.

» Table 3 — Service Data

SIZE MODEL 50 R-22 CHARGE* (lb)

Refrig Control

INDOOR FAN

Rotationt Rpm Diameter (in.) Width (In.)

Range (cfm)

Motor Hp

OUTDOOR FAN

Ctm Rpm Diameter (In) Motor Hp

CCW — Counterclockwise CW — Clockwise

‘Factory refrigerant charge tLooking at fan motor shaft

212

ET I QT

2 3 I 2 7

215

ET lOT ET 1 QT

23)27

AccuRa

CW I CW I CW I CCW I CCW

1580 1550 1570 1675 1675

430/ 1 550/ 1 575/ 1 885/ 1 1025/

Propeller, Direct Drive, Single Speed

1700 1 1700 1 2000 1 2000 1 2000

218

3 1 1 3 75

ter'" BypaE

Centrifugal Blower,

Direct Drive, 2-Speed

6 1 6 1 6 1 7 1 7

375 475 480 800 960

V. 1 '/, 1 % 1 '/4 1 '/4

1125

’/b

224 230

ET 1 QT ET 1 QT

4.0 1 4 5

s Type

39)47

START-UP

Crankcase Heater — The 50QT compressor is

equipped with a crankcase heater that is thermostatically activated in cold weather. (See Fig. 2 and 3.) If tempera ture is below 65 F, operate crankcase heater 24 hours

before starting unit. To energize crankcase heater only, after chassis installation, set thermostat to ^^ position (for thermostat mounted on the chassis) or OFF position (for remote-mounted thermostat) and turn on

unit power at disconnect switch.

Bookn 11 |4 |4 PC 131 Catalog No 535-078 PrintedinUSA Form 50ET.QT-3SI Pg4 5-85 Replaces 50QT-10SI Tab llbisahalsa

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obiigations.

For replacement items use Carrier Specified Parts

50ET,QT

HEATING A COOLING

To Start Unit — Check that main power is on and,

if temperature is below 65 F, that compressor crankcase

heater has been energized for at least 24 hours.

1. Set selector switch at <; -O—^ if thermostat is mounted on chassis, or at OFF if thermostat accessory

is remote mounted.

2. Set fan switch as desired (FAN) (AUTO.).

3. Set thermostat lever at the desired temperature.

4. Set selector .switch at HEAT or COOL. Check sy.stem refrigerant charge. See Refrigerant Charging.

SERVICE

Service Port Connections — High and low side

pressure connections are accessible from the indoor portion of the unit for charging. (See Fig. 3.)

Low-Pressure Switch (50QT only) (Safety Control) is located on liquid line downstream of Accu-

Rater™ control during cooling mode (or upstream of

AccuRater control during heating mode). Switch opens at 5 psig and shuts down compressor to protect it from overheating if refrigerant charge is too low.

High-Pressure Relief Valve (Safety Control) is

located in compressor. Relief valve opens at a pressure differential of approximately 450 ± 50 psi between

suction (low side) and discharge (high side) to allow

pressure equalization.

Internal Current and Temperature Sensitive

Overload (Safety Control) resets automatically

when compressor motor temperature drops to a safe level

(overloads may require up to one hour to reset). When an

internal overload is suspected of being open, check by

using an ohmmeter or continuity tester. If necessary,

refer to Carrier Standard Service Techniques Manual,

Chapter 2, Electrical, for complete instructions.

Defrost Control consisting of a control board and

defrost thermostat, interrupts normal system heating

operation to remove frost and iee formation on outdoor

Single-Package Units

coil. Frost impairs unit performance. Defrost control simultaneously stops outdoor fan, energizes reversing valve solenoid to switch system into cooling cycle (out door unit as condenser, indoor unit as evaporator), and activates accessory electric heater. Unit can defrost every 90 minutes, but will do so only if outdoor temperatures are in the frosting temperature zone.

For heat pump to defrost, 2 eonditions are necessary;

1 Defrost circuit board contacts must be closed.

2. Coil temperature must be cold enough to cause defrost thermostat contacts to close.

Contacts clo.se at 27 ±5 F. Every 90 minutes of elap.sed

running time, the defrost circuit board contacts close for

10 seconds. If the defrost thermostat contacts are closed, the unit defrosts The defrost circuit board limits defrost ing period to 10 minutes. Normally the frost is removed and the defrost thermostat contacts will open to terminate defrosting before 10 minutes have elapsed. Defrost thermostat contacts open at 80 ±5 F. When defrosting is terminated, the outdoor fan motor is energized and

reversing valve solenoid is de-energized, returning unit to heating cycle.

HEAT PUMP CIRCUITS shown in Fig. 5 are refrig erant flow diagrams for heating and cooling cycles.

Refrigerant Charging

A CAUTION

To prevent personal injury, wear safety glasses and gloves when handling refrigerant.

Do not overcharge system. An overcharge can

cause compressor damage.

Unit refrigerant system is factory charged. When recharging is necessary, weigh in total charge indicated in Table 3. (Charge must be weighed in during heating season.) Remove any refrigerant remaining in system before recharging. If system has lost complete charge.

3 Unit Piping

Fig. 5 — 50QT Refrigerant Flow Diagrams

Manulacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obiigations.

Bookll h |4 |4 PC131 Catalog No 535-078 PrintedinUSA Form 50ET,QT-3S1 Pg5 5-85 Replaces: 50QT-10SI

FROcTlT^r^ Pgj replacement items use Carrier Specified Parts

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