Analog Inputs-Auxiliary Control Boards (Ccb1, Ccb2, Gcb1, Ehb1 & Erb1); Binary Inputs-Main Control Board (Mcb); Binary Inputs-Auxiliary Control Boards (Ccb1, Ccb2, Gcb1, Ehb1 & Erb1); Ccb1 & Ccb2 (7Rps, Rfs/Rcs, Rdt, Rpr & Rfr) - Daikin MicroTech II Installation And Maintenance Manual

Analog Inputs—Auxiliary Control Boards (CCB1,
CCB2, GCB1, EHB1 & ERB1)
The optional auxiliary control boards (CCB1, CCB2, GCB1,
EHB1 and ERB1) have up to six analog inputs available.
However, in this product application, these are used only on
the ERB1. Analog inputs ERB1-A1 and ERB1-A2 are
configured for temperature sensor inputs. The remainder are
spare inputs.
Refer to Table 9 for a description of each analog input on the
ERB1 board.
Table 9: Analog inputs for energy recovery wheel control
board (ERB1)
Analog
input
ERB1-AI1 Leaving energy recovery wheel temperature (exhaust),
optional
ERB1-AI2 Leaving energy recovery wheel temperature (discharge)
ERB1-AI3 Not used
ERB1-AI4 Not used
ERB1-AI5 Not used
ERB1-AI6 Not used
Binary Inputs—Main Control Board (MCB)
The 16 binary inputs to the MCB are in the form of 0 VAC
(off) or 24 VAC (on) applied to the binary input terminals.
Transformer T2 is the source of this the 24 VAC for these
inputs.
Each binary input has an LED associated with it that lights
when 24 VAC is present at the corresponding input terminal.
These binary input LEDs are grouped together and are located
in the upper left had corner of the board. Table 10 summarizes
the binary input functions and LED indications for the binary
inputs to the MCB.
Table 10: Binary inputs for main control board (MCB)
Binary
Input description
input
MCB-BI1 External Time clock or tenant override
MCB-BI2 Manual system disable
MCB-BI3 Remote cool enable
MCB-BI4 Remote heat enable
MCB-BI5 Gas furnace flame failure alarm
MCB-BI6 Airflow status
MCB-BI7 Freeze alarm for steam or hot water coils
MCB-BI8 Smoke alarm: supply air, return air or both
MCB-BI9 First filter switch
MCB-BI10 Final filter switch (optional)
MCB-BI11 Outdoor enthalpy status
MCB-BI12 Not used
MCB-BI13 External exhaust fan status (optional)
c
MCB-BI14 Duct hi limit
MCB-BI15 Not used
MCB-BI16 Not used
a. Not used on 100% outdoor air units.
b. Applicable only on VAV units configured for "fan tracking" return fan
control.
c. Applicable on VAV units only.
Daikin IM 696-4
Input description
Lit LED
indication
Occupied
Disabled
Enabled
Enabled
Alarm
Airflow detected
Normal
Normal
Normal
Normal
a
Low OA enthalpy
—
b
On
Normal
—
—
Binary Inputs—Auxiliary Control Boards (CCB1,
CCB2, GCB1, EHB1 & ERB1)
The optional auxiliary control boards include 12 binary inputs.
Inputs BI1 through BI6 are designed for a set of dry contacts
between the COM terminal and the individual binary input
terminals on J9. BI7 through BI12 are designed for 24 VAC
inputs (input is ON when 24 VAC is present at the
corresponding input terminal on J10 and OFF when 0 VAC is
not present). The following sections described how these
inputs are defined for each of the auxiliary control boards.
Note – The set of two jumpers in the upper right corner of the
board (below the RS-485 Communications module) must
both be placed on the right most pins. Placing the jumper
on the left most pins interlocks binary inputs BO1 with
BI1 and BO2 with BI2 respectively. This interlock is not
used on this product application
CCB1 & CCB2 (7RPS, RFS/RCS, RDT, RPR & RFR)
When a unit is equipped with a factory condensing unit, each
of the two cooling circuits is controlled with an auxiliary
control board. Circuit #1 is controlled by the CCB1 and circuit
#2 is controlled by the CCB2. Table 10 and Table 11 on
page 24 summarize the binary inputs for the CCB1 and CCB2
respectively.
GCB1 (RDS & RAH)
When a rooftop air handling unit is interfaced with a field
supplied condensing unit, the cooling stages in the condensing
unit are controlled by a generic condenser auxiliary control
board. This board is designated GCB1. In this case only
GCB1-BI12 is defined in the GCB1 control software. It is a
"cool enable" input. Cooling is enabled when 24 VAC is
present and disabled when 24 VAC is not present at this input.
This input is supplied to the GCB1 through a "cooling enable"
output from the MCB.

EHB1

When a unit is equipped with multistage electric heat, the
heating stages are controlled by an electric heat auxiliary
control board. This board is designated EHB1. In this case
only EHB1-BI12 is defined for the EHB1. It is a "heat enable"
input. Heating is enabled when 24 VAC is present and disabled
when 24 VAC is not present at this input. This input is supplied
to the EHB1 through a "heating enable" output from the MCB.

ERB1

When a unit is equipped with an optional energy recovery
wheel system, the system is controlled by an energy recovery
auxiliary control board. This board is designated ERB1. None
of the binary inputs are used on the ERB1.
Service Information
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