Carrier 38APS025 - Motormaster Required Configurations; Motormaster V Option;Accessory

125
Table 52 — 38APD130 Fan Staging (cont)
*Items in either Service Test
o
OUTS or Outputs
o
GEN.O.
†Fans that affect both circuits.
**Motormaster controlled motor.
Motormaster V Option/Accessory — For low-ambient oper-
ation, the first stage of fan is equipped with the Motormaster V
head pressure controller option or accessory. Units
38APD025-060 and 38APS025-065 have one Motormaster V
controller for each unit. The 38APD070-130 units have two
Motormaster V controllers, one in each circuit.
If equipped, the Motormaster controller must be enabled in
the controls. See Table 53.
Table 53 — Motormaster Required Configurations
Although the control has a Minimum Fan Speed configura-
tion, the Motormaster V device has a programmed point for
minimum fan speed. Its default is 8 Hz. This is above the
minimum speed for the unit control. This parameter does not
need to be adjusted.
Once Motormaster V controller is enabled, the calculated
value Fan On Set Point (F. O N ) is lowered by 10° F (5.6° C).
Using the factory defaults, F. O N =105.0 F [115.0 – 10.0° F]
(40.6 C [46.1 – 5.6° C]) or following a fan stage increase,
F. O N = 120 F [115.0 + 15.0 – 10.0° F] (48.8 C [46.1 + 8.3 –
5.6° C]) for 60 seconds following the fan stage increase.
The Motormaster V controller is provided an ON command
with the first stage of fan, and is started at 100%. It adjusts fan
speed through a 0 to 10 vdc output from the AUX Board. On
38APD025-060 units, the highest circuit SCT controls the
speed signal to the Motormaster V controller to try to maintain
it at 105 F (40.6 C). On 38APD070-130 and 38APS025-065
units, each circuit controls its Motormaster V controller to try
to maintain SCT at 105 F (40.6 C) for the circuit.
The signal to the Motormaster V controller can be moni-
tored through the scrolling marquee or Navigator™ display.
Each circuit has a corresponding signal in percentage of full
speed. These values can be found under Var Head Press Out
Cir A (Outputs
o
GEN.O
o
V. H P A ) and Var Head Press Out
Cir B (Outputs
o
GEN.O
o
V. H P B ). For units that use a single
Motormaster controller (38AP025-060), the output will be dis-
played under V. H P A . For 38APS065, the output will be
displayed under V. H P B .
UNIT OPERATING CIRCUIT FAN STAGE OUTPUT POINT NAME* CONTACTOR FANS ENERGIZED
38APD130
With Motormaster
®
Controller
A
1FAN5FC5OFM7**
2
FAN1
FAN5
FC1†
FC5
OFM5
OFM7**
3
FAN1
FAN4
FAN5
FC1†
FC4†
FC5
OFM5
OFM3, OFM8
OFM7**
4
FAN1
FAN3
FAN4
FAN5
FC1†
FC3†
FC4†
FC5
OFM5
OFM2, OFM4, OFM6
OFM3, OFM8
OFM7**
B
1FAN2FC2OFM1**
2
FAN1
FAN2
FC1†
FC2
OFM5
OFM1**
3
FAN1
FAN2
FAN4
FC1†
FC2
FC4†
OFM5
OFM1**
OFM3, OFM8
4
FAN1
FAN2
FAN3
FAN4
FC1†
FC2
FC3†
FC4†
OFM5
OFM1**
OFM2, OFM4, OFM6
OFM3, OFM8
A and B
1
FAN2
FAN5
FC2
FC5
OFM1**
OFM7**
2
FAN1
FAN2
FAN5
FC1†
FC2
FC5
OFM5
OFM1**
OFM7**
3
FAN1
FAN2
FAN4
FAN5
FC1†
FC2
FC4†
FC5
OFM5
OFM1**
OFM3, OFM8
OFM7**
4
FAN1
FAN2
FAN3
FAN4
FAN5
FC1†
FC2
FC3†
FC4†
FC5
OFM5
OFM1**
OFM2, OFM4, OFM6
OFM3, OFM8
OFM7**
CONTROL BOX
OFM1
OFM2
OFM7
OFM8
CKT A
CKT B
OFM3
OFM4
OFM5
OFM6
CONFIGURATION
o
M.MST
ITEM EXPANSION COMMENTS
MMR.S Motormaster Select
YES = Factory Equipped
(Default)
NO = Not Equipped
Value: YES to enable
MIN.S Minimum Fan Speed
Range: 0 to 100%
Default: 8%