Carrier 50HQ User Manual download pdf (Page 4)

Table 3 — Electrical Data

UNIT MODEL

50HQ,VQ

V/PH/HZ

OPERATING

VOLTAGE

COMPRESSOR

FAN

FLA

MINIMUM

CIRCUIT

MAXIMUM

FUSE

AMPS AMPS

Max

Min LRA RLA

014

37 5

9 6

7 12.7

018

53 0

134

17.7

022

197

65 0 13 3

1.5 18 1 30

027

208-230/1/60 253

66 0

16 2

1 7 22 0 35

033

88 0 23 3

2 5 31.6

042

100 0

27 7

3 2

37 8

048

187

94 0 23 9

34 33 4 60

060

150 0 35,3

4.5

48.6

033

87 0 13 8 2 5

19 8 30

042

100 0

18 5

3 2

26 3

048

208-230/3/60 253 187 80 0

16 8 3 9 24 9

060

136 0 20 6

4 5

30 6

080

137 0 20 7

6 2 32 1

033

30 0 60

1 1

8 9

042 36 5

6.9

1 6 10 2

048

460/3/60 508

414

35 0 8 2

20 12 3

060 49 0 104

2 6

15 3 25

080 69 0 11 4

31 17 4

FLA — Full Load Amps

LRA — Locked Rotor Amps

RLA — Rated Load Amps

INSTALL BALANCING VALVES (with shutofO

in water supply and return lines for water flow

adjustment and a means of water shutoff, if neces

sary, when servicing unit. When multiple units are

connected in parallel, valves permit removal of one

unit without interrupting water flow to other

units.

MAKE CONDENSATE DRAIN LINE CON

NECTION to female pipe connection provided on

unit. Fig. 4 and 5. Install a trap in condensate line as

close as possible to unit. Trap must be at least 3 in.

deep and not higher than the bottom of unit con

densate drain opening. Pitch condensate line to

open drain or sump. Insulate a condensate drain line

located above a living area.

50HQ Units Only — If a secondary drain is re

quired, remove plastic cap from secondary drain

connection, located in bottom of unit, and connect

drain so that discharge is obvious to maintenance

personnel.

Step 4 — Make Electrical Connections — Field

wiring must comply with local and national fire,

safety and electrical codes. Voltage to unit must be

within the operating voltage range indicated on

nameplate or in Table 3. On 3-phase units, phases

must be balanced within 2%.

Operation of unit on improper line voltage or

with excessive phase imbalance constitutes abuse

and is not covered by Carrier Warranty.

INSTALL A BRANCH CIRCUIT DISCONNECT

PER NEC of adequate size to handle unit starting

current. Locate disconnect within sight of and

readily accessible from the unit, per Section 440-14

of National Electrical Code (NEC).

BRING POWER LEADS INTO UNIT — Extend

leads from disconnect per NEC thru hole provided

(Fig. 1 and 2) into line wiring splice box. Fig. 6.

CONNECT GROUND LEAD TO GROUND

LUG IN SPLICE BOX for safety. Connect power

wiring. See Fig. 6. Splice line power leads to yellow

and black pigtails on single-phase units or yellow

pigtails on 3-phase units. Use wire nuts. Tape each

connection.

Unit transformer on 208-230-volt units is factory

wired for 230/24-volt operation. For 208/24-volt

operation, remove black (230-v) transformer lead

from unit contactor and connect red (208-v) lead to

contactor. Cap unused transformer lead.

SET FAN MOTOR SPEED — Set fan motor for

high-, medium- or low-speed operation as follows:

1. Remove unit fan section access panel.

2. Locate Molex fan speed selector block on fan

housing. Fig. 7. Selector block receptacle 1 is

high fan speed, receptacle 2 is medium fan speed

and receptacle 3 is low fan speed. Yellow and

black fan motor power leads from control box

are connected to selector block receptacle C and

1. Yellow lead is common, black lead is speed-

change lead.

3. To change fan motor speed, remove black lead

from selector block receptacle and plug it into

desired receptacle. Receptacle 4 is not used.

CAUTION: For proper utiit operation, set unit

fan motor speed for air quantity witbin range

shown in Table 4.

Set Fan Motor Speed on 460-Volt Units — Two-

speed fan motor is factory wired for high-speed oper

ation. (Yellow and black power leads from control

box are connected to the yellow and black fan motor

leads.) Change fan motor to low speed by wiring as

follows:

1. Splice the violet and black fan motor leads

together.

1 2 3 4 5 6 7 8 9 ... 13 14

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Carrier 50HQ User Manual Page 4

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