199
APPENDIX F — OPTIONAL FACTORY-INSTALLED LOW AMBIENT MOTORMASTER
®
V CONTROL (cont)
Configure Motormaster
®
V Control
The Motormaster V control is configured for proportional inte-
gral (PI) control mode. The Motormaster V control varies the
condenser fan motor speed to maintain a setpoint of liquid line
head pressure. See Table L. Note that the pressure transducer
must be attached for proper configuration.
Table L — Configuration Table
The following ComfortLink control configurations must be set
when using a Motormaster V device:
• Configuration
COOL
M.M. = YES
Test Motormaster V Control
To test the control and motor in the test mode, run compressor
no. 1. The Motormaster V electronic control adjusts the fan
speed based on the liquid line pressure input. Ensure that fans
are rotating clockwise (as viewed from above). If rotation is
backward, lock out all power then swap 2 leads AFTER the
Motormaster V control.
For 48/50A2,A3,A4,A5 units, fan stages react to discharge
pressure transducers (DPT) (Pressures
REF.P
DP.A and
DP.B) which are connected to the compressor discharge piping
in circuit A and B. The control converts the pressures to the
corresponding saturated condensing temperatures (Tempera-
tures
REF.T
SCT.A and SCT.B).
Fig. P — Low Ambient MMV Control Location — 48/50A060 MCHX Units
NOMINAL
VOLTAGE
(V-Ph-Hz) MODE
CONTROL
INPUTS
(Pin 5) START CONTACTS
230-3-60
1
4 to 20mA
TB1,2460-3-60
575-3-60
208-3-60 2
TB13A,2
380-3-60
400-3-50 4
TB 13C,2
To Next Page
Loading...
