Carrier 48TM016-028 Installation, Start-Up And Service Instructions Manual 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
5 / -in. long. Drill required screw holes for mounting baffles.
8
To avoid damage to the refrigerant coils and electrical com-
ponents, use recommended screw sizes only. Use care
when drilling holes.
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:
TEMPERATURE OPERATING LIMITS — F° (C°)
Standard Unit with
Unit Low Ambient Kit
40 (4) 25 (–4)
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.
1 / -in. diameter and
4
Unit with
MMV Control
–20 (–29)
18
TO PRESSURE
TRANSDUCER
Fig. 24 — Motormaster® V Control
Table 6 — Motormaster V Control Package Usage
UNIT VOLTAGE
208/230
48TM016-028 460
575
Table 7 — Applicable Voltages and Motors
VOLTAGE
208/230-3-60
460-3-60
575-3-60
FROM FUSE BLOCK
B
13B
13C
12 13A
2 5 6 2
2 3
1
TO MOTOR(S)
ITEM DESCRIPTION
CRLOWAMB015A00
CRLOWAMB016A00
CRLOWAMB017A00
COMPATIBLE MOTOR
HD52AK654
HD52AK654
HD52GE576