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MOTORMASTER® V CONTROL INSTALLATION
(48TJ024,028 UNITS)
Install Field-Fabricated Wind Baflles -- Wind baflles must
be field-fabricated for all units to ensure proper cooling cycle
operation at low ambient temperatures. See Fig. 21 for baflle
details. Use 20-gage, galvanized sheet metal, or similar corro-
sion-resistant metal for baffles. Use field-supplied screws to at-
tach baffles to unit. Screws should be l/4-in, diameter and
5/8-in. long. Drill required screw holes for mounting baffles.
To avoid dmnage to the refligerant coils and electrical com-
ponents, use lecommended screw sizes only. Use cme
when &'illing 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 le-
frigerant 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 mnbient temperatures at which the unit will
operate are:
TEMPERATURE OPERATING LIMITS -- F°
Standard Unit with I Unit with
Unit Low Ambient Kit I MMV Control40 25 -20
To operate down to the ambient temperatures listed,
Motormaster V controls (Fig. 23) must be added. Field-fabricat-
ed and installed wind baffles gue _dso required for _dl units (see
Fig. 21). The Motormaster V control permits operation of the
unit to an ambient temperature of-20 IF.The control regulates the
speed of 3-phase fan motors that guecompatible with the control.
These motors me factory installed.
See Table 6 for the Motormaster V control accessory pack-
age usage. Table 7 shows applicable voltages and motors.
Replacement of motor or fan blade IS NOT REQUIRED ON
CURRENT PRODUCTION UNITS since the control is
compatible with the factory-installed fan motors. Only field
wiring control is required.
Inst_dl the Motormaster V control per instructions supplied
with accessory.
o
TO PRESSURE
TRANSDUCER
FROM FUSE BLOCK
10 o---1
>- ca
u 1.2 1.3
o
o
B
13B
ooo
o
TO MOTOR(S)
Fig. 23 -- Motormaster V Control
Table 6 -- Motormaster V Control Package Usage
UNIT I VOLTAGE
208/230
48TJ024,028 460
575
ITEM DESCRIPTION
CRLOWAMB015A00
CR LOWAMB016A00
CRLOWAMB017A00
Table 7 -- Applicable Voltages and Motors
VOLTAGE COMPATIBLEMOTOR
208/230-3-60 HD52AK654
480-3-60 HD52AK654
575-3-60 HD52GE576
16