MatrixMonitor™ IOM - Rev 4 - 4/11/2013
Page 47
The maximum airflow in the table below is the flow at which the pressure depression at the throat or
cone tap equals 13 inches WC. ClimateCraft® uses this table to select our recommended piezometric tap
location. When the individual fan airflow will exceed the maximum airflow for the throat tap in the
table, ClimateCraft will locate the tap in the cone. If the fan array is designed to give N-1 redundancy,
the maximum design airflow will occur when one fan is off line.
Fan Size
Maximum Design Airflow (cfm)
Throat Tap
Cone Tap
MTX12
4,500
8800
MTX15
4,500
8,800
MTX16
5,500
10,700
MTX18
6,700
12,700
MTX20
8,100
15,200
MTX22
10,300
18,800
MTX24
12,000
23,000
MTX27
14,500
27,500
Interface to Building Management System
MatrixMonitor™ can interface with the building management system (BMS) in two ways. There are hard
wired analog signals and a digital communication interface using the Modbus protocol over a 2 wire,
multipoint, EIA/TIA 485 communication port.
The physical connections are made on the motherboard with pull off terminal strips. The connections
can be exposed by opening the clear cover of the NEMA 4 enclosure, removing the two fasteners
opposite the hinged side and opening the swing out panel. The terminals are designed for solid or
stranded wire from 14 to 26 AWG wire size. Strip the wire 3/16” back from the wire end to make the
specified contact with the terminal block. The pull off strips makes wiring to the BMS I/O connections on
the motherboard easy to accomplish.
WARNING
The wiring connections to the MatrixMonitor™ should only be made when the power is disconnected.
Failure to disconnect power before servicing can cause severe personal injury or death.
Hard Wired Connections
The basic communication method for MatrixMonitor™ is through hard wired analog and relay output
signals.
There are four analog output signals. The signals are 0 to 10 VDC and each can drive a 20mA load at 10
volts. The four output signals report array 1 airflow, array 1 pressure rise, array 2 airflow, and array 2
