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digital input points, whereas the RTU has only eight
inputs, two of which are configurable. The RCB has four
analog outputs for use in controlling variable speed fans,
economizers or modulating heating and/or cooling valves,
whereas the RTU has only two analog outputs for use only
with VS fans and economizers. The RCB also features a
more sophisticated HHT interface and updated algorithms
for controlling heating, cooling, dehumidification, and air
quality.
The MultiFlex RCB has its own installation and operation manual, (P/N 026-1707).
The PAK can control up to 4 condenser fan groups
containing up to 8 total condenser fans. The PAK condenser control strategy is sequential TD control with setpoint/deadband using ON and OFF delays.
The PAK has a compressor/condenser interlock feature that will override TD control and force the condenser
fans to stage off using the TD control OFF delay when all
compressors are off. This feature can be disabled with an
Enable/Disable setpoint or when the discharge pressure is
above a configurable setpoint.
The MultiFlex PAK boards consist of two circuit
boards: a bottom layer with 16 combination digital/analog
inputs, and a plug-in top layer which contains a combination of 8 relay outputs and 4 digital DC voltage outputs.
The analog outputs on the Multiflex PAK drive solid
state relays to control the fan stages. The relays control the
compressor groups.
The communication interface is RS-485 I/O using the
Standard Extended Address Form for CPC Distributed
Controllers. Currently, the PAK is designed to interface
with the CPC Einstein controller.
LEGEND
1
INPUT POWER
(24VAC)
9
RS-485 TERMINATION
JUMPERS
2
RS-485 I/O NETWORK
10
HAND-HELD TERMINAL JACK
3
RCB INPUTS 1-8
11
RELAY OUTPUT CONNECTORS
4
RCB INPUTS 9-16
12
RELAY OUTPUT FUSES
(2A rated, 250V slowblow)
5
NETWORK ID DIP
SWITCHES (S3, S4)
13
RELAY STATUS LEDs
6
INPUT TYPE DIP
SWITCHES (S1, S2)
14
OUTPUT FAIL-SAFE
SWITCHES
7
BOARD STATUS LEDs
(Code A, Code B, General
Status)
15
ANALOG OUTPUTS
8
DC POWER OUTPUTS
(3 at +5VDC, 1 at
+12VDC)
16
NETWORK STATUS
LEDs
LEGEND
1
INPUT POWER
(24VAC)
9
RS-485 TERMINATION
JUMPERS
2
RS-485 I/O NETWORK
10
HAND-HELD
TERMINAL JACK
3
PAK INPUTS 1-8
11
RELAY OUTPUT
CONNECTORS
4
PAK INPUTS 9-16
12
RELAY OUTPUT FUSES
(2A rated, 250V slowblow)
5
NETWORK ID DIP
SWITCH (S3)
13
RELAY STATUS LEDs
6
INPUT TYPE DIP
SWITCHES (S1, S2)
14
RELAY FAIL-SAFE
SWITCHES
7
BOARD STATUS LEDs
(Code A, Code B, General
Status)
15
PAK ANALOG
OUTPUTS 1-4
8
DC POWER OUTPUTS
(3 at +5VDC, 1 at
+12VDC)
16
NETWORK STATUS
LEDs
Table 2-8 - MultiFlex RCB
2.2.3.6
MultiFlex PAK Board
The PAK is a distributed pack (rack) controller that
controls compressors and condenser fans. The PAK can
control up to 8 compressor groups containing up to 16
compressors. The compressor control strategy is Fixed
Steps with setpoint/deadband using ON and OFF delays.
Up to 20 Fixed Steps can be configured.
Table 2-9 - MultiFlex PAK
I/O Network Boards and Peripherals
Hardware Overview • 2-7