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
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.
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
WARNING
Open all remote disconnects before servicing this equip-
ment. Electrical shock could result in personal injury.
48/50P2,P3,P4,P5 UNIT SIZE
VOLTAGE
ACCESSORY PART NUMBER
035
208/230-3-60
Not Required, Std Unit Motor
400-3-50, 460-3-60
Not Required, Std Unit Motor
575-3-60
Not Required, Std Unit Motor
380-3-60
HD56AK380
030, 040-060
208/230-3-60
HD52AK002
400-3-50, 460-3-60
HD52AK002
575-3-60
Not Required, Std Unit Motor
380-3-60
Not Required, Std Unit Motor
070
208/230-3-60
HD52AK002 (2 Required)
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
075-100
208/230-3-60
Not Available
400-3-50, 460-3-60
HD52AK002 (2 Required)
575-3-60
Not Required, Std Unit Motor
380-3-60
Not Available
48/50P2,P3,P4,P5030-100
Low Ambient Operation
MOTORMASTER
®
V Control Accessory
50/60 Hz
