CONTROL BOX | OFM1 |
|
Top View
Sizes 010,015
BOX | OFM1 |
| |
CONTROL | OFM3 |
| |
| OFM2 |
| Top View |
| Sizes |
| OFM1 |
|
|
BOX |
|
CONTROL | OFM2 |
|
Top View
Sizes
CONTROL BOX | OFM1 | OFM3 | |
OFM2 | OFM4 | ||
|
Top View
Sizes 055,060
Fig. 15 — 30RAP Condenser Fan Layout
Table 20 — Fan Stages
30RAP UNIT SIZE |
| FAN STAGES |
| |
Fan Stage | Contactor Energized | Fans Operating | ||
| ||||
010,015 | Stage 1 | — | OFM1 | |
Stage 1 | FC1 | OFM1 | ||
Stage 2 | FC1,2 | OFM1,2 | ||
| ||||
Stage 1 | FC1 | OFM3 | ||
Stage 2 | FC2 | OFM1,2 | ||
| Stage 3 | FC1,2 | OFM1,2,3 | |
| Stage 1 | FC3 | OFM4 | |
055,060 | Stage 2 | FC1,3 | OFM4,3 | |
Stage 3 | FC3,2 | OFM4,1,2 | ||
| ||||
| Stage 4 | FC1,2,3 | OFM1,2,3,4 |
Two other control methods are available for Machine On/ Off control:
OCCUPANCY SCHEDULE (Configuration→OPT2 →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.
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→MODE) will be 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→OPT2→CTRL = 3) — 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→MODE) 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
33
the CHIL_S_S variable is ‘Stop.’ Similarly, the control mode will be 6 when the CHIL_S_S variable is ‘Start.’
Table 20 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.
Cooling Set Point Select
SINGLE — Unit operation is based on Cooling Set Point 1 (Set Points→COOL→CSP.1).
DUAL SWITCH — Unit operation is based on Cooling Set Point 1 (Set Points→COOL→CSP.1) when the Dual Set Point switch contacts are open and Cooling Set Point 2 (Set Points→COOL→CSP.2) when they are closed.
DUAL CCN OCCUPIED — Unit operation is based on Cooling Set Point 1 (Set Points→COOL→CSP.1) during the Occupied mode and Cooling Set Point 2 (Set Points→COOL→CSP.2) during the Unoccupied mode as configured under the local occupancy schedule accessible only from CCN. Schedule Number in Table SCHEDOVR (See Ap- pendix B) must be configured to 1. If the Schedule Number is set to 0, the unit will operate in a continuous
