Operation Of Machine Based On Control Method And Cooling Set Point Selection Settings - Carrier AQUASNAP 30RAP010-150 Start Up & Operation Manual

OFM1
TOP VIEW
SIZES 010,015
OFM1
OFM3
OFM2
TOP VIEW
SIZES 035-050
MOTORMASTER ® V OPTION — Motormaster V is stan-
dard on 30RAP010 and 015 size units. For all other units that
need low-ambient operation, the lead fan on a circuit can be
equipped with the Motormaster V head pressure controller op-
tion or accessory. The controller is energized with the first fan
stage and adjusts fan speed to maintain a SCT of 72 F (22.2 C).
The first stage of fan operation is controlled by the Motormas-
ter V controller. Refer to Fig. 21 for condenser fan layout infor-
mation. The Motormaster is configured in the Motormaster Se-
 
lect (Configuration MM
Operation of Machine Based on Control
Method and Cooling Set Point Selection Set-
Machine On/Off control is determined by the
tings —
configuration of the Control
 
tion OPT2 CTRL) and Cooling Set Point Select (Config-
 
uration SLCT CLSP) variables. All units are factory
configured with Cooling Set Point Select set to 0 (single set
point). With the control method set to 0, simply switching the
Enable/Off/Remote Contact switch to the Enable or Remote
Contact position (external contacts closed) will put the chiller
in an occupied state. The control mode (Operating

Modes MODE) will be 1 (OFF LOCAL) when the switch is
Off and will be 5 (ON LOCAL) when in the Enable position or
Remote Contact position with external contacts closed.
Two other control methods are available for Machine On/
Off control:
OCCUPANCY SCHEDULE

CTRL = 2) — The main base board will use the operating
schedules as defined under the Time Clock mode in the scroll-
ing marquee display. These schedules are identical. The sched-
ule number must be set to 1 for local schedule.
OFM1
OFM2
TOP VIEW
SIZES 018-030
OFM3
OFM1
OFM2
OFM4
TOP VIEW
SIZES 055,060
Fig. 21 — 30RAP Condenser Fan Layout
MMR.S)
Method (Configura-

(Configuration OPT2
OFM3
OFM1
OFM2
OFM4
TOP VIEW
SIZES 070-150
The schedule number can be set anywhere from 65 to 99
for operation under a CCN global schedule. The Enable/Off/
Remote Contact must be in the Enable or Remote Contact posi-
tion. The control mode (Operating Modes
1 when the switch is Off. The control mode will be 3 when the
Enable/Off/Remote Contact switch input is On and the time of
day is during an unoccupied period. Similarly, the control
mode will be 7 when the time of day is during an occupied
period.
CCN CONTROL (Configuration
An external CCN device such as Chillervisor System Manager
controls the On/Off state of the machine. This CCN device
forces the variable 'CHIL_S_S' between Start/Stop to control
the chiller. The control mode (Operating Modes
will be 1 when the switch is Off. The control mode will be 2
when the Enable/Off/Remote Contact switch input is On and
the CHIL_S_S variable is 'Stop.' Similarly, the control mode
will be 6 when the CHIL_S_S variable is 'Start.'
Table 10 illustrates how the control method and cooling set
point select variables direct the operation of the chiller and the
set point to which it controls. The illustration also shows the
ON/OFF state of the machine for the given combinations.
30
a30-5459
130-150
100-150
ONLY ONLY
OFM5 OFM7 OFM9
OFM6 OFM8 OFM10
NOT ON
080-150
100,130
ONLY

MODE) will be
 
OPT2 CTRL = 3) —

MODE)