Operating instructions

17
Table 10 — Fan Board C Inputs and Outputs (30XA400-500)
Enable-Off-Remote Contact Switch (SW1) —
This switch is installed in all units and provides the owner and
service person with a local means of enabling or disabling the
machine. It is a 3-position switch and it is used to control the
chiller. When switched to the Enable position, the chiller will
be under its own control. When switched to the Off position,
the chiller will shut down. When switched to the Remote Con-
tact position, a field-installed dry contact can be used to start
the chiller. The contacts must be capable of handling a 24-vac,
50-mA load. In the Enable and Remote Contact (dry contacts
closed) positions, the chiller is allowed to operate and respond
to the scheduling configuration, CCN configuration, and set
point data.
For units with a Touch Pilot™ display, the position of the
Enable/Off/Remote contact switch is ignored except when the
“remote mode” control type is selected. Refer to the Machine
Control Methods section on page 22 for more details.
Emergency On/Off Switch (SW2) — This switch is
installed in all units. The Emergency On/Off switch should
only be used when it is required to shut the chiller off immedi-
ately. Power to all modules is interrupted when this switch is
off and all outputs from these modules will be turned off.
Energy Management Module (EMM) — The EMM
is available as a factory-installed option or as a field-installed
accessory. See Fig. 13. The EMM receives 4 to 20 mA inputs
for the temperature reset, cooling set point and demand limit
functions. The EMM also receives the switch inputs for the
field-installed second stage 2-step demand limit and ice done
functions. The EMM communicates the status of all inputs
with the MBB, and the MBB adjusts the control point, capacity
limit, and other functions according to the inputs received. See
Table 11.
Hot Gas Bypass/Pump Board — The hot gas by-
pass (HGBP) and pump board controls the ON/OFF of the
HGBP solenoids and pump contactors, and responds to MBB
commands via the LEN connection. Hot gas bypass is avail-
able as a factory-installed option or as a field-installed accesso-
ry for 30XA080-500, and the pump package is available as
factory-installed option for sizes 30XA090-162. See Fig. 14.
The board is not required for single pump operation. See below
for DIP switch information. See Table 12 for HGBP/Pump
board inputs and outputs.
DESCRIPTION INPUT/OUTPUT I/O TYPE DISPLAY MODULE POINT NAME
CONNECTION POINT
(Unit Size)
Pin Notation
Power (24 vac supply) —— —
FBC-J1
11 24 vac
12 Ground
Local Equipment Network —— —
FBC-J9
+ RS485 Port (D+)
G RS485 Port (Gnd)
- RS485 Port (D-)
+ RS485 Port (D+)
G RS485 Port (Gnd)
- RS485 Port (D-)
Circuit C Discharge
Pressure Transducer
DPTC Pressure Transducer Discharge Pressure, DP.C FBC-J7-CH13
Circuit C Suction
Pressure Transducer
SPTC Pressure Transducer Suction Pressure, SP.C FBC-J8-CH14
Circuit C Low Ambient
Temperature Head Pressure
Control Speed Signal
MM-C 0-10 VDC Head Press Actuator Pos, SPD.C
FBC-CH9
+ Signal
- Ground
Fan Contactor C1 FCC1 Contactor FBC-J2-CH1
Fan Contactor C2 FCC2 Contactor FBC-J2-CH2
Fan Contactor C3 FCC3 Contactor FBC-J2-CH3
Fan Contactor C4 FCC4 Contactor FBC-J2-CH4
Fan Contactor C5 FCC5 Contactor FBC-J3-CH5
Fan Contactor C6 FCC6 Contactor FBC-J3-CH6
Fan Contactor C7 FCC7 Contactor FBC-J3-CH7
Fan Contactor C8 FCC8 Contactor FBC-J3-CH8
CAUTION
Care should be taken when interfacing with other manufac-
turer’s control systems due to possible power supply differ-
ences, full wave bridge versus half wave rectification,
which could lead to equipment damage. The two different
power supplies cannot be mixed. ComfortLink™ controls
use half wave rectification. A signal isolation device should
be utilized if incorporating a full wave bridge rectifier sig-
nal generating device is used.
HGBP/Pump
BOARD
DIP SWITCH
123 45678
Address: ON ON ON OFF ON OFF ON OFF