8 Daikin IM 696-4
General Description
Auxiliary Control Boards
(CCB1, CCB2, EHB1, and ERB1)
There are up to four optional auxiliary control boards. These
are the cooling control boards (CCB1 and CCB2 or G
CB1),
the electric heat control board (EHB1) and the energy recovery
wheel control board (ERB1). Although the input and output
functions on the four boards are defined differently in
software, the boards are physically identical.
The CCB1 and CCB2 are used whenever
a unit is equipped
with a factory DX cond
ensing unit (models RPS, RFS/RCS,
RDT, RPR, RPE, RDE, RCE, and RFR). The GCB1 board,
loaded with special generic cooling staging software, can also
be used to control a field supplied condensing unit interfaced
with an air handling unit (RDS or RAH) equipped with a DX
cooling coil. The CCB1 and CCB2 or GCB1 are not used on
units equipped with chilled water or no cooling.
The EHB1 is used whenever a unit is equipped with more than
one stage
of el
ectric heat. It is not used on units with single
stage or modulating heat.
The ERB1 is used whenever a unit is equipped with an
optional energy recovery wheel
system.
A typical auxiliary control board is shown in Figure 6. This
board receives up to 6 analog and 12 binary inputs and
exchanges information with the MCB via an RS-485
communication bus
.
Figure 6: Auxiliary control board (CCB1 board shown)
Binary inputs
terminal block
Binary o utputs
terminal block
(RS485)
communications
terminal block
Analog inputs
terminal block
To Next Page
Loading...
Need help?
General
