Carrier 48TM016-028 Specifications download pdf (Page 18)

MOTORMASTER® V CONTROL INSTALLATION

(48TM025 Only)

Install Field-Fabricated Wind Baffles

— Wind baffles must

be field-fabricated for all units to ensure proper cooling cycle

operation at low ambient temperatures. See Fig. 22 for baffle

details. Use 20-gage, galvanized sheet metal, or similar

corrosion-resistant metal for baffles. Use field-supplied screws

to attach baffles to unit. Screws should be

-in. diameter and

-in. long. Drill required screw holes for mounting baffles.

Install Motormaster V Controls

— The Motormaster V

(MMV) control is a motor speed control device which adjusts

condenser fan motor speed in response to declining liquid

refrigerant pressure. A properly applied Motormaster V control

extends the operating range of air-conditioning systems and

permits operation at lower outdoor ambient temperatures.

The minimum ambient temperatures at which the unit will

operate are:

To operate down to the ambient temperatures listed,

Motormaster V controls (Fig. 24) must be added. Field-

fabricated and installed wind baffles are also required for all units

(see Fig. 22). The Motormaster V control permits operation of

the unit to an ambient temperature of –20 F (–29 C). The control

regulates the speed of 3-phase fan motors that are compatible

with the control. These motors are factory installed.

See Table 6 for the Motormaster V control accessory

package usage. Table 7 shows applicable voltages and motors.

Replacement of fan motor IS NOT REQUIRED ON

CURRENT PRODUCTION UNITS since the control is

compatible with the factory-installed fan motors. Only field

wiring control is required.

Install the Motormaster V control per instructions supplied

with accessory.

Table 6 — Motormaster V Control Package Usage

Table 7 — Applicable Voltages and Motors

To avoid damage to the refrigerant coils and electrical com-

ponents, use recommended screw sizes only. Use care

when drilling holes.

TEMPERATURE OPERATING LIMITS — F° (C°)

Standard

Unit

Unit with

Low Ambient Kit

Unit with

MMV Control

40 (4) 25 (–4) –20 (–29)

UNIT VOLTAGE ITEM DESCRIPTION

48TM016-028

208/230 CRLOWAMB015A00

460 CRLOWAMB016A00

575 CRLOWAMB017A00

VOLTAGE COMPATIBLE MOTOR

208/230-3-60 HD52AK654

460-3-60 HD52AK654

575-3-60 HD52GE576

Fig. 24 — Motormaster® V Control

256

12 13A

13B

13C

TO MOTOR(S)

TO PRESSURE

TRANSDUCER

BLK

YEL

BLU

FROM FUSE BLOCK

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 59 60

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Carrier 48TM016-028 Specifications Page 18

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