Analog Inputs-Auxiliary Control Boards (Ccb1 And Ccb2); Binary Inputs-Main Control Board (Mcb); Binary Inputs-Auxiliary Control Boards (Ccb1 And Ccb2) - McQuay MicroTech II Installation And Maintenance Manual

Analog inputs—Auxiliary Control Boards
(CCB1 and CCB2)
The optional auxiliary control boards (CCB1 and CCB2)
have up to 6 analog inputs.
Note: Only CCB*-AI5 is used, the other five AIs are not
used and not supported in the application software.
Refer to Table 9 for a description of each analog input on the
CCB1 or CCB2 board.
Table 9: Analog inputs for compressor control
boards (CCB1 and CCB2)
Analog input
AI1 Not used
AI2 Not used
AI3 Not used
AI4 Not used
AI5 Cool enable/ pump enable
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 the 24 VAC for these inputs.
Table 10: Binary inputs for main control board (MCB)
Binary 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 Heat failure alarm
MCB-BI6 Airflow status
MCB-BI7 Freeze alarm for steam, hot water coils, or waterside economizer
MCB-BI8 Smoke alarm
MCB-BI9 Filter switch
MCB-BI10 Not used
MCB-BI11
Outdoor enthalpy status
MCB-BI12 Not used
MCB-BI13 Not used
MCB-BI14
Duct Hi limit
MCB-BI15 Not used
MCB-BI16 Water flow switch
a. Not used on 100% outdoor air or waterside economizer units.
b. Applicable on VAV units only.
McQuay IM 710-1
Input description
Input description
a
b
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 hand corner of the board. Table 10
summarizes the binary input functions and LED indications
for the binary inputs to the MCB.
Binary Inputs—Auxiliary Control Boards
(CCB1 and CCB2)
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 describe how
these inputs are defined for each of the auxiliary control
boards.
Note: The set of jumpers in the upper right corner of the
board (under the RS-485 Communications Module)
must both be in the "down" position (jumper on the
bottom two 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.
Lit LED indication
Occupied
Disabled
Enabled
Enabled
Alarm
Airflow detected
Normal
Normal
Normal
-
Low OA Enthalpy
-
-
Normal
-
Normal
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