Carrier 50YQ User Manual

Jrt<twnna y >' ^

Numb^One AirConditbning Maker

installation, Start-llp

Division of Carrier Cotporalio

Carrier Parkway • Syracuse NY 13221

Single-Package Heat Pumps

and Service instructior^

SAFETY CONSIDERATIONS INSTALLATION

Step 1 — Check Equipment and Jobsite

• UNPACKAGE UNITS

• INSPECT EQUIPMENT

• COMPLETE OR CONSIDER SYSTEM REQUIREMENTS

Step 2 — Mount Heat Pump Package ..

• ON THE GROUND: MOUNT HEAT PUMP ON AN ELEVATED FRAME POSITIONED ON A LEVEL CON CRETE PAD

• ON THE ROOF: MOUNT UNIT ON A

LEVEL PLATFORM OR FRAME

Step 3 — Make Ductwork Connections

• CONNECT SUPPLY AND RETURN AIR DUCTWORK

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

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

Page

, 1-4

. 1

INDEX

Step 4 — Provide for Cooling Cycle Condensate Disposal for Cooling Cycle ... 4

• CONNECT DRAIN LINE

^Step 5 — Make Electrical Connections... 4

• INSTALL A BRANCH CIRCUIT DISCONNECT PER NEC

• ROUTE LINE POWER WIRES INTO UNIT

• CONNECT GROUND LEAD TO GROUND LUG IN SPLICE BOX FOR SAFETY

• SET INDOOR FAN MOTOR SPEED

• ROUTE CONTROL POWER WIRES

• ELECTRIC HEATER INSTALLATION

START-UP.............................................................5-7

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

V TROUBLESHOOTING

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

15, 16

^ SAFETY CONSIDERATIONS

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

service air conditioning equipment.

Untrained personnel can perform basic main

tenance functions of cleaning coils and filters and replacing filters. All other operations should be per formed 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.

INSTALLATION

Step 1 — Check Equipment and Jobsite

UNPACKAGE UNITS — Move units to final loca tion. Slide units from cartons taking special care nob to damage unit.

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

COMPLETE OR CONSIDER SYSTEM RE QUIREMENTS before installing the 50YQ units.

Consult local building codes and National Elec trical Code (NEC) for special installation requirements.

Provide sufficient space for coil airflow clearance, wiring, and servicing unit. (See Fig. 1.) Locate unit where supply and return air ducts can be con veniently brought out to unit duct connections.

Unit may be placed with duct side as close to building as condensate drain, top removal, duct con nections and power connections permit. Position unit so water or ice from roof does not drop directly

on top of unit or in front of coil. Make provisions for condensate drainage and defrost water disposal.

Roof installation method for 50YQ depends on

building construction and special requirements of local building codes. Ensure that roof can support unit weight. Protect unit from prevailing winds to ensure adequate defrost.

0'-6j3^

■g CONDUIT

CONTROL-*“»

WIRING

If DKO

ELECTRIC^ HEAT X

l| DKO LINE

WIRING'

CONN

L> INDOOR AIRFLOW ^ OUTDOOR AIRFLOW RIGHT SIDE VIEW

Ceitified dimension drawings available on request

Fig. 1

Dimensions and Connections

Table 1 — Installation Data (See Fig. 1)

UNIT OPER WEIGHT (lb)

dTmeNsToNS (ft-in )

A B C' 1-11-5/8 1-11-5/8 1-11-5/8

DUCT CONN (ft-in )

D 1- 7-3/4 1- 7-3/4

FILTER SIZEt (in.)

Disposable 20x25 Permanent 15x20

‘Dimension "C" includes 1-in built-in base support channels fRecommended field-supplied filters are 1-in thick

50YQ024

303

50YQ030

320

15x20 (2)

20x20 20x25 20x25

Step 2 — Mount Heat Pump Package

ON THE GROUND; MOUNT HEAT PUMP ON AN ELEVATED FRAME POSITIONED ON A

LEVEL CONCRETE PAD See Pig. 2 for pad

dimensions. Ensure pad does not obstruct coil slots

in unit basepan. (Slots drain water during heating and defrost cycles. See Fig. 2 for drain slot loca tions.) Construct pad a minimum of 6 in. thick to provide clearance under basepan coil slots for

drainage and ice buildup. In areas where prolonged

subfreezing temperatures or snowfall occur, increase clearance to 12 to 18 inches by constructing an angle-iron frame to support unit 12 to 18 in. off concrete base. Design cross angle of frame so as to not obstruct basepan coil slots. See Fig. 3 for recom mended frame construction. Alternate construction should follow dimensions. Extend a 24-in. gravel apron around pad for condensate and defrost water

drainage field.

ON THE ROOF: MOUNT UNIT ON A LEVEL

PLATFORM OR FRAME — Elevate unit for

proper clearance as described under ground installa

tion above. Design roof and plan water runoff so as to prevent unit and its duct flashing from sitting in water, in accordance with all applicable codes.

50YQ036

333

4-0-7/16 3-6-1/4

Side-by-Side Rectangular

1- 7-3/4 1 1-11-3/4

15x20 20x20

50YQ042

375

2- 3-5/8

20x20 (2)

50YQ048

417

2-7-5Z8

2-3-3/4

20x25 20x20

15x20 (2)

50YQ060

448

3-1-5/8

2-9-3/4

25x25

_2.Ûx25 ^

20x20 (2)

Step 3 — Make Ductwork Connections

CONNECT RETURN AND SUPPLY AIR

DUCTWORK — Connect ductwork to unit supply and return air duct connections. Refer to Fig. 1 and Table 1 for unit supply and return air connection

sizes and locations.

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«ïTH «JCT coitwecTfONS.

«Nfraasc

?ïEAfîsii«e8?a«(T^

y-t ■

A / ■

UNIT OUTÏ-iN?-

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ooKOT i««oei%E»soss«E«T>

mnotutcPimz ^

d47«IS AilES.

mres.

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fr««» as(Xi, <S«!«>s.on A «• 4S >o, <s 3S sncsse«^ 1«

3r«AS where eievsieci f:e«» is f.oi A w A2

iHmee&'cm B js 3T xiches

2 AJiow a 3'*t service, ctoarahce at frotrt fear anc feit sioe of unit

Fig. 2 — Concrete Pad Dimensions

fMm

iz TOS'«

□ «Sy iSJRSS

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Ajrets íftOfí - li TO f-s COMMt STO { ■POTAL í&6ftMTrTY 2Sf 7035Ÿ >

m.0 FRA«E TO^TtíE».

PAífíT WlTH2l«C-ÍÍ}C» ?*»ÍT(StíSTf«OOP>

re“ fc&5 fíBi

3 3}í(J}fiS£0

F¡g. 3 — Heat Pump Mounting Frame

Flanges are provided on unit for rectangular duct connections. Figure 4 shows a typical duct system with 50YQ installed. Do not operate unit longer

than 5 minutes without ductwork. If necessary, refer

to Carrier System Design Manual, Part 2, for sys

tem air duct design. When designing and installing

ductwork, consider the following:

a. When connecting ductwork to unit, do not drill

holes in area shown below. Coil may be damaged.

b. Install field-supplied filters in return air duct

work. Recommended sizes for filters are shown in Table I.

c. Avoid abrupt duct size increases and reductions.

■d. Use flexible connectors between ductwork and unit to prevent transmission of vibration. When

electric heater is installed, use fireproof canvas

(or similar heat resistant material) connector be tween ductwork and unit discharge connection. If flexible duct is used, insert a sheetmetal sleeve inside duct. Design this connector or sleeve so that it extends 24 in. from electric heater element.

Size ductwork for cooling air quantity (cfm). The

minimum air quantity for proper heating/ cooling operation and electric heater operation is 400 cfm per ARI cooling ton as listed below:

UNIT 50YQ MIN CFM

024 833 030 036 042 048 060 193 3

100 0

118 3

136 6 163 3

Heater limit switches may trip at air quantities

below those recommended.

Insulate and make weatherproof all external ductwork. Insulate and cover with a vapor barrier all ductwork passing thru unconditioned

spaces. Follow latest SMACNA (Sheet Metal and Air Conditioning Contractors National

Association) and NESCA (National Environ

mental Systems Contractors Association) mini

mum installation standards for residential heat

ing and air conditioning systems.

g. Secure all ducts to building structure. Weather

proof duct openings in wall or roof according to good construction practices.

"Separate disconnect required for electric heater

> Fig. 4 — Typical Installation — 50YQ

Step 4 — Provide for Cooling Cycle Conden sate Disposal — Condensate may be drained

directly onto gravel apron or connected by drain line(s) to a dry well. Follow local codes.

CONNECT DRAIN LINE to rubber condensate drain fitting on side of unit (see Fig. 5). Use clamp provided. Install factory-supplied condensate trap (taped to indoor fan compartment for shipment) at end of drain line. If a drain line is not used, connect condensate trap to unit drain fitting as shown in

Fig. 5.

CONDENSATE TRAP (SHIPPING LOCATION, INSTALL ON CONDENSATE DRAIN LINE)

voltage to unit is within ± 10% of voltage indicated on nameplate. On 3-phase units, check that phases are balanced within 2%. Contact local power company for correction of improper line voltage.

Oisrratton «kf tïiïÿi <M3t 3t

wth exijessm phase

¡as

coiaM

affect waCFaïïty,

See Table 2 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 unit and for each accessory electric heater circuit as required. (See electrie 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).

ROUTE LINE POWER LEADS INTO UNIT ^

Extend leads from disconnect per NEC thru hole

provided (Fig. 1) into line wiring splice box (Fig. 6).

Use copper or copper-clad aluminum wire. (Do not

make connections with aluminum wire.)

UNIT CONTROL BOX

CONTROL WIRING TERMINAL BOX

Fig. 6 — Unit Control Box

CONTROL WIRING CONDUIT,

CONNECT GROUND LEAD TO GROUND LUG IN SPLICE BOX FOR SAFETY — Connect power wiring. See Fig. 7. Connect line power leads to yellow and black pigtails on single-phase units; yellow, blue and black pigtails on 3-phase units.

SET INDOOR FAN MOTOR SPEED — Refer to

page 3 for minimum allowable air quantity for safe electric heater operation. Three-speed indoor fan motor is factory wired for high-speed operation. Fan motor is equipped with spade-type speed selec tor terminals marked 1, 2 and 3. For electric heater operation, set motor at: “Low” — sizes 024 thru 042; “High” — size 048; “Med” — size 060.

CONDENSATE DRAIN LINE

¡i DKO LINE

POWER

Fig. 5 — Condensate Drain and Trap Details

Step 5 — Make Electrical Connections — In

stall field wiring in compliance with local and national fire, safety and electrical codes. Be sure

781

MOTOR TERMINAL

FAN SPEED

High Medium Low

2 3

ROUTE CONTROL POWER WIRES (24-v) thru

7/8-in. conduit provided in unit. Fig. 1 and 5. Ex

tend leads to unit control wiring terminal board in

unit control box. Connect leads to terminal board

as directed in Fig. 8.

The 50YQ unit transformer supplies 24-v power for complete system including accessory electric heater.

i-r'

Table 2 — Unit Electrical Data (60-Hz)

OPER

VOLTAGE*

MODEL

50YQ024 50YQ030

^ 50YQ036

50YQ042 50YQ048

50YQ060 50YQ042

50YQ048 50YQ036 50YQ042

50YQ048 70

50YQ042 50YQ048 35

50YQ042 50YQ048 30 60

AWG BCSC

FLA IFM LRA OFM RLA HACR — Heating Air Conditioning & Refrigeration

V/PH

Max Min

207

230/1

208/230/1 253

200/3 220

200/230/3 253

230/3

460/3 506

575/3 632 518

American Wire Gage Branch Circuit Selection Current

Full Load Amps Indoor Fan Motor Locked Rotor Amps Outdoor Fan Motor Rated Load Amps

253

187tt

180 180

207

414

COMPRESSOR

LRA

72 88 94 21.0

106 150

79 146

87 16 9 183 49 87

gT~

RLA

154 16 1 18 2

25 0 27 9 49

29 2/33 4

12 5/11 7

U6 143

14 8 16 4 4 9 2 2 10 58

g 3

7.5 8 8 49

BCSC

ELECTRIC HEATER INSTALLATION — For complete heater installation data, refer to accessory electric heater Installation, Start-Up and Service Instructions.

GROUND LUG

(IN SPLICE BOX)

--GROUND LEAD-

l-PHASE

CONN

TO DISCONNECT PER NEC

3-PHASE CONN

TO DISCONNECT

PER NEC

_____

Field Wiring Splice Connections

NOTE Use copper or copper-clad aluminum wire

________________

------

GROUND LEAD-

LI----------------------------------------------

L2-

______________________________

BLK

-YEL

50YQ HEAT PUMP

GROUND LUG

(IN SPLICE BOX)

■ -^-BLK--

BLU

-YPl

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

-YEL

50YQ HEAT PUMP

-----------

----------

-----------

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

(

Fig. 7 — Line Power Connections

START-UP

The 50YQ unit compressors are equipped with crankcase heaters. It is recommended that heater be energized a minimum of 24 hours before starting unit. To energize heater only, set thermostat at OFF posi

tion; turn on unit main power at disconnect switch.

IFM

OFM

Min

FLA FLA

—

2 4 1 3 10 48

—

24 1 3 10

—

21 2

35 3 16 6 49 20 10

— 3 6

6 8

64 49 2 2

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

satisfactorily

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 fuse ttMinimum voltage is 197 when outdoor ambient temperature exceeds

105 F

2 1 10 38 10 45

3 6

1 9 8

2 2

6 4 20

2 2 2 1 10 74

49”

i¥~ 67

1 9 ‘

49 4 9 2 2 14 90

49 1 9

Wire

Size

(AWG)t

6 4

14 164 14 14 141 14 15

BRANCH CIRCUIT

Min Gnd

Max

Wire

(AWG)t

}— -1

46 52 10 50

71 10

43 55 10 40

104 14 15

Max Fuse

Wire

or HACR

Type Ckt»*

Size

Bkr Amps

10 45 30 0 10 30 21.3/25 3

id 24 7

10 40 27 6

12 20

Min

Circuit

Amps

35 23 0 35

60 60

15 11 2

23 8 28 5 33 3 42 0

52 5 27 6

12 4 14 6

10 9

Heat Anticipator Settings for Room Thermo

stat — Set anticipator settings for room thermostat

according to Table 3. These settings may be changed slightly to provide a greater degree of comfort for a particular installation.

Table 3 — Thermostat Anticipator Setting

ACCESS.

ELECTRIC

HTR (Kw)

240 V 280 V

5 0 3 75

5 6

7 5

100 15 0 11 3 20 0 150 25 0 188 27 0

22 25

SECOND STAGE

ANTICIPATOR

SETTING

-gg— —

26 26 52 52 52 78

UNIT

50YQ024,

030,036, 042,048,

060

FIRST STAGE

ANTICIPATOR

SETTING

Fixed

Accessory Outdoor Thermostat provides adjust

able outdoor control of accessory electric heaters of 15 Kw and over. This thermostat makes contact when a drop in outdoor temperature occurs. It ener gizes a stage of electric heat when the outdoor tem perature 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 emer gency heat switch in the indoor thermostat subhase.

The indoor thermostat locks out compressor and the

relay bypasses the outdoor thermostats for electric heater operation during heat pump shutdown. When one outdoor thermostat is used, an emergency

heat relay is not required. The emergency heat

switch in the indoor thermostat subbase bypasses

outdoor thermostat, locks out compressor and acti vates electric heater.

184

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