Carrier 50MQ User Manual

Number One Air Conditioning Maker

Division ot Carrier Corporatio Syracuse New York

Single-Package Heat Pump Units

The 50MQ units are completely self-contained cooling and heating systems with provision for addition of accessory electric heaters. They are air-to-air heat pumps designed for outdoor installa tion. They may be connected into existing duct systems which are properly sized and designed to handle an air quantity of 400 to 500 cfm per ton

of cooling. Required connections include air ducts,

condensate drain, line and control power wiring.

Field-supplied filter must be installed in return air duct. (See Table 1 for filter size.)

INSTALLER'S PRELIMINARY SURVEY

Step 1 — Inspect Equipment — File claim with

shipping company if shipment is damaged or incomplete.

Step 2 — Complete or Consider the Following

before installing the 50MQ unit;

a. Consult local building codes for special installa

tion requirements.

b. Provide sufficient space for coil air flow clear

ance, wiring, and servicing unit. (See Fig. 1.)

Table 1 — Installation Data (See Fig. 1.)

UNIT OPER WT (lb) DIMENSIONS

{ft-in») A

DUCT CONN.

(ft-in.)

Supply j

Return

FILTER SIZEt (in.)

Disposable

Permanent

‘Dimension "C" t Recommended

50MQ022 50MQ027 50MQ032

315

B 3-

2- 3Ys

1-1OY4

0- 6^6

0-10“/,6

1 -- 1 6

, , H

20 X 25

15 X 20

includes 1 1/4-in built-in base support channels (2)

field-supplied filters are 1-in. thick

330 340

2- 3%

1-1OV4

0-10“/,6

1 — 1 6 1 — 1 ^/] 6

Sid e'b y- Si (d€ Rect an gu or

20 X 25 15 X 20(2)

20 X 20 20 X 20

6‘/4

2- 3% 2- 7%

1-10^4

0- óV.e 0-10“/Ì6

1- 9% 0-

\QX

1 -

, ,,T

4-0 OVERHEAD AIR SPACE REQUIRED

50MQ037

353

1-1OY4

0- 6V,6 0-10“,(e

1 5 X 20

20 X 20

20 X 25

c. Locate unit where supply and return air ducts

can be conveniently brought out to unit duct connections.

d. Unit may be placed with duct side as close to

building as condensate drain, top removal, duct

connections and power connections will permit

Position unit so water or ice from roof will not

drop directly on top of unit or in front of coil

e. Make provisions for condensate drainage and

defrost water disposal. See Mounting Pad and

Cooling Cycle Condensate Disposal.

f. Roof installation method for 50MQ will depend

on building construction and special require ments of local building codes. Ensure roof will support unit weight. See Mounting Pad for details.

a OIAM HOLE-

CONTROL WIRING CONN

l| DIAM HOLE-UNIT

LINE WIRING CONN „

O SUPPLY AIR

^ RETURN AIR

Certified dimension drawings available on request

REAR VIEW

SPACE REQUIRED FOR SERVICE ON REAR OF UNIT IS I'-O"

Fig. 1 — Dimensions and Connections

CHANNELS-2)

■g ID SIDE CONDENSATE

DRAIN FITTING

Form No 50MQ-1SI

MOUNTING PAD

Step 3 — On the Ground: Mount Unit on a Solid,

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

Ensure pad does not obstruct coil slots in unit base pan. (Slots drain water during heating cycle). Construct pad a minimum of 6 in. thick to provide

clearance under base pan coil slots for drainage and

ice buildup. In areas where prolonged subfreezing

temperatures, drifting or heavy snows occur, in crease clearance to 12 to 18 inches. If climatic conditions dictate, construct an angle iron frame to support unit 12 to 18 in. off concrete base. Cross angle of frame must not obstruct base pan coil slots. Extend a 24-in. gravel apron around pad for condensate and defrost water drainage field.

Step 4 — 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 and its duct flashing from sitting in water.

for system 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. All units should have field-supplied filters in

stalled in return air ductwork. Recommended

sizes for filters are shown in Table 1. 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 asbes-

• tos (or similar heat resistant material) con nector between ductwork and unit discharge connection. Heat resistant duct connector must extend 24 in. from electric heater element.

e. Size ductwork for cooling air quantity (cfm).

The minimum air quantity for safe electric heater operation is;

Fig. 2 — Concrete Pad Dimensions

DUCTWORK

Step 5 — Connect Supply and Return Air 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.

Flanges are provided on unit for rectangular duct connections. Fig. 3 shows a typical duct system with 50MQ installed. Do not operate unit longer than 5 minutes without ductwork. If neces sary, refer to Carrier System Design Manual, Part 2,

INDOOR

UNIT FAN 5.0

SPEED

50MQ022 50MQ027 Med = H i 900 50MQ032 50MQ037

Med-Lo

Med-Lo Med-Lo

ELECTRIC HEATER KW

7.5 1 10.0 j 15.0

Cfm

733 733 1

900 I 900

]068 1068 1 1230

1068 Í 1068

1230 ' 1230 j1230

20.0

733 j

1230

Heater limit switches may trip at air quantities below those recommended.

f. All external ductwork must be insulated and

weatherproofed. Ducts passing thm uncondi

tioned space must be insulated and covered with vapor barrier in accordance with the latest issue of SMACNA’s (Sheet Metal and Air Conditioning Contractors National Association)

and NESCA’s (National Environmental Systems Contractors Association) minimum installation

standards for residential heating and air condi

tioning systems.

g. Secure all ducts to building structure. Weather

proof duct openings in wall or roof according

to good construction practices.

— POWER WIRING

-------

CONTROL WIRING

OUTDOOR air flow

INDOOR AIR FLOW pUMP

«Separate fused disconnect required for electric heater.

Fig. 3 — Typical Installation

COOLING CYCLE CONDENSATE DISPOSAL

Condensate may be drained directly onto gravel apron or connected by drain line(s) to a dry well Condensate disposal methods must comply with

local codes and practices.

Step 6 - Connect a Drain Line to rubber conden

sate drain fitting on side of unit (see Fig. 1). Use

clamp provided. Install factory-supplied conden sate trap (taped to indoor fan housing for ship ment) at end of drain line. If a drain line is not

used, connect condensate trap to unit drain fitting

as shown in Fig 4.

ELECTRIC HEATER INSTALLATION

For complete heater installation data, including

accessory outdoor thermostat and emergency heat switch, refer to accessory electric heater Installa tion, Start-Up and Service booklet. Complete

control wiring connections are shown in this booklet.

CONDENSATE DRAIN FITTING

WITFI CLAMP

Fig. 4 - Condensate Drain Connection

CONDENSATE DRAIN TRAP

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 nameplate. On 3-phase units, phases must be balanced within 2%.

Operation of unit on improper line voltage or ; with e.xcessive phase unbalance constitutes abuse and is not covered by Carrier Warranty.

See Table 2 for recommended wire and fuse sizes

Step 7 — Install a Branch Circuit Fused Disconnect

of adequate size to handle unit starting current. Locate disconnect within sight of and readily accessible from the unit. (Use a separate fused disconnect(s) for each electric circuit as required.)

Step 8 — Bring Line Power Leads Into Unit.

Extend leads from fused disconnect thru hole pro

vided (Fig. 1) into line wiring splice box (Fig, 5).

Step 9 — Connect Ground Lead to Ground Lug in Splice Box before connecting power wiring. See Fig.

6. Connect line power leads to yellow and black pigtails on single-phase units or yellow, blue and

black pigtails on 3-phase units. Use wire nuts

'provided. Tape each connection. Wire nuts are

suitable for copper or aluminum wire since they contain joint compound.

Step 10 — Set Indoor Fan Motor Speed — (Refer

to page 2 for minimum allowable air quantity for

safe electric heater operation). Four-speed indoor

fan motor is factory wired for high speed opera tion. Fan motor is equipped with spade-type speed selector terminals marked 1, 2, 3 and 4. For lower fan speed, remove black unit lead from motor spade terminal 1 and connect to spade terminal 2, 3 or 4. On alternate fan motors remove black

motor lead from unit connection and replace with

blue, orange or red motor lead.

MOTOR LEAD MOTOR TERMINAL

FAN SPEED

Black

Hig h

B lue

Medium

Hig h

Orange Red

Med ium

Low

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

through 7/8-in. hole provided in unit. Fig. 1. Extend leads to unit control wiring terminal board. Fig. 5. Connect leads to terminal board as directed in Fig. 7.

HEATER INSTALLATION AREA

INDOOR FAN MOTOR

CONTROL WIRING TERMINAL BOARD

WIRING KNOCKOUTS

■AND HOLES (HIDDEN) SEE FIG t

LINE WIRING SPLICE BOX

LINE VOLTAGE PIGTAILS

Fig. 5 — Unit Wiring Terminal Location

Table 2 — Unit Electrical Data

OPER

MODEL V/PH

50MQÒ22 50MQ027 S0MQ032 50MQ037

50MQ022 50MQ027 50MQ032 50MQ037

50MQ032 50MQ037

FLA — Full Load Amps LRA — Locked Rotor Amps IFM — Indoor Fan Motor OFM — Outdoor Fan Motor

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

operate satisfactorily.

tRequIred when using nonmetallic conduit.

■ —

200/1

230/1 254

200/230/3 200/230/3

VOLTAGE* Max

220

254 180 254 180

Min

180

207

COMPRESSOR

LRA FLA FLA

75 14.1 2 2 80 16.2 2.2 2.2 99

112

68 12 8 72 88 18 0

100

75 13.0/11.5 3.6/3.1

IFM OFM

20.8 3.6 2 2

26.5

14 0

23.0 3.4

15.0/12 8

3.9 2.2 8 35 10

2.0 1 9 12 32

2.0 3 1

3.9/3.4

NO TE S :

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

2. All units equipped with 24-v transformer for external control circuit.

3. Copper wire sizes based on 60 C. Aluminum field wiring may be used when spiice connected to copper pigtails from unit with factorysupplied wire nuts. Use latest National Electrical Code for aluminum wire sizing.

BRANCH CIRCUIT

Power Max Gnd Max

FLA

2.2 10 40 10

1.9 10 1 9

1.9 8 45 10

2.2/1.9 10/12 50/42 10/12 35/30

2.2/1.9

Wire Ft

Size

(AWG)

10/10 45/60 10/10 35/30

W ire

35 10 43

47 10 36 10 45

Wire Fuse

Sizet

(AWG)

10 50

Amps

35 40

+ 8 hidden pages