Carrier 48/50P2, 48/50P4 installation instructions Contents, Safety Considerations, General

48/50P2,P3,P4,P5030-100 Low Ambient Operation MOTORMASTER® V Control Accessory 50/60 Hz

Installation Instructions

Part Numbers: CRLOWAMB033A00 THROUGH CRLOWAMB038A00

CONTENTS

Page

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1

GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Step 1 — Install Field-Fabricated Wind Baffles . . . 3

Step 2 — Mounting and Electrical Connections for Motormaster® V Control . . . . . . . . . . . . . . . . . . . . 5

Step 3 — Configure Motormaster V Control . . . . . 11

Step 4 — Test Motormaster V Control . . . . . . . . . . . 11

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-13

TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . 13-15

SAFETY CONSIDERATIONS

Installation, start-up, and servicing of this equipment can be hazardous due to system pressures, electrical components, and equipment location (roofs, elevated structures, etc.).

Only trained, qualified installers and service technicians should install, start up, and service this equipment.

When working on this equipment, observe precautions in the literature and on tags, stickers, and labels attached to the equipment and any other safety precautions that may apply.

WARNING

Open all remote disconnects before servicing this equip- ment. Electrical shock could result in personal injury.

GENERAL

This book contains instructions for the installation, start-up, and service of the Motormaster V (MMV) control on 48/50P030-100 units.

The Motormaster V control is a motor speed control device which adjusts condenser fan motor speed in response to varying 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.

To operate these units at very low ambient temperatures, Mo- tormaster V controls (Fig. 1) must be added. Field-fabricated and installed wind baffles are also required for units in areas with pre- vailing winds of more than 5 mph (8 kph) and where tempera- tures drop below 32 F (0° C). The Motormaster V control permits operation of the unit to an ambient temperature of –20 F (–29 C). The control regulates the speed of one or two 3-phase fan motors depending on unit size. Replacement of the fan motor on most units is not necessary since the control is compatible with the factory-installed fan motors. To verify that unit fan motors are compatible with the control see Table 1.

See Tables 2-4 for the Motormaster V control accessory pack- age usage and contents. Field wiring of control is required.

Table 1 — Replacement Motor Part Numbers

48/50P2,P3,P4,P5 UNIT SIZE	VOLTAGE	ACCESSORY PART NUMBER
	208/230-3-60	Not Required, Std Unit Motor
035	400-3-50, 460-3-60	Not Required, Std Unit Motor
	575-3-60	Not Required, Std Unit Motor
	380-3-60	HD56AK380
	208/230-3-60	HD52AK002
030, 040-060	400-3-50, 460-3-60	HD52AK002
	575-3-60	Not Required, Std Unit Motor
	380-3-60	Not Required, Std Unit Motor
	208/230-3-60	HD52AK002 (2 Required)
070	400-3-50, 460-3-60	HD52AK002 (2 Required)
	575-3-60	Not Required, Std Unit Motor
	380-3-60	Not Required, Std Unit Motor
	208/230-3-60	Not Available
075-100	400-3-50, 460-3-60	HD52AK002 (2 Required)
	575-3-60	Not Required, Std Unit Motor
	380-3-60	Not Available

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

Catalog No. 04-53480070-01 Printed in U.S.A. Form 48/50P-2SI Pg 1 9-09 Replaces: New