30
Matrix Installation and Operation Instructions
Table 8.1 Low Voltage Field Connections (See Figure 8.2)
Terminal
Description
Plenum
Sensor
Plenum Temperature Sensor –
Each Matrix is provided with a temperature sensor that is to be field installed in the
supply plenum. When installed the Matrix Fan (blue) controller with display the plenum temperature and may provide
additional features depending on the application.
Outdoor
Sensor
Outdoor Temperature Sensor –
Each Matrix is provided with an outdoor temperature sensor that may be field
installed to provide Outdoor Reset for applications were the Matrix is providing heat to a Hydronic Heating System.
H
Hydronic Heat Input –
Input requiring 24VAC from terminal R to initiate a demand for Hydronic Heat. Switch is
made using an isolated end switch (dry contact), e.g. hydronic zone controller. Not used in applications w/o Hydronic
Heating. Boiler temperature setting is made via the HYD setting in the (red) Boiler Controller, see Table 9.4.
FS
DHW Heat Input –
Input requiring 24VAC from terminal R to initiate a demand for DHW Heat. Switch is made using
an isolated end switch (dry contact), e.g. dhw flow switch or tank aqua-stat. Note: this input is normally not used, as
the Matrix incorporates a DHW Flow Meter to detect DHW demands.
DH
De-Humidistat Input –
Input requiring 24VAC from terminal R to initiate a demand for high ventilation with the
optional built-in HRV (Heat Recovery Ventilator). Switch is made using an isolated end switch (dry contact), e.g.
centrally located De-humidistat (may be incorporated in Thermostat), or “wet room” timers. Note: this function only
acts to de-humidify during colder weather by increasing ventilation, it is not intended for de-humidification during
warmer months.
G
Circulation Fan Input –
Input requiring 24VAC from terminal R to initiate a demand for the Circulation Fan. Switch is
made using an isolated end switch (dry contact) normally incorporated in the home thermostat. Air circulation rate is
set via the FAN setting in the (blue) Fan Controller, see Table 9.5.
R
24VAC Hot –
Power supply for inputs H, FS, DH, W1, W2, Y1 and Y2.
W1
Forced Air Central Heat Input –
Input requiring 24VAC from terminal R to initiate a demand for the Forced Air
Central Heat. Switch is made using an isolated end switch (dry contact) normally incorporated in the home
thermostat.
W2
Forced Air Central Heat Input (Stage 2) -
Input requiring 24VAC from terminal R to initiate a demand for Stage 2
Forced Air Central Heat. Switch is made using an isolated end switch (dry contact) normally incorporated in the home
thermostat. Note: most application will not require the use of input W2, NTI recommends using W1 only for Forced
Air Central Heating.
Y1
Air-Conditioning / Heat Pump Input (Stage 1)
– Input requiring 24VAC from terminal R to initiate a demand for
stage 1 cooling (or heat pump). Switch is made using an isolated end switch (dry contact) normally incorporated in
the home thermostat. CFM rate adjustable via Y1 setting in the (blue) Fan Controller, see Table 9.5.
Y2
Air-Conditioning / Heat Pump Input (Stage 2)
– Input requiring 24VAC from terminal R to initiate a demand for
stage 2 cooling (or heat pump). Switch is made using an isolated end switch (dry contact) normally incorporated in
the home thermostat. CFM rate adjustable via Y2 setting in the (blue) Fan Controller, see Table 9.5. Note: Y2
demand overrides a Y1 demand.
NC
COM
NO
Hydronic Heat Lockout Relay Contacts
– The Matrix Fan control incorporates a Normally Closed (NC) and a
Normally Open (NO) relay contact that switches position on a demand for DHW. The contacts are to be used to
lockout the Hydronic Heat draw during concurrent DHW demands in order to maintain DHW priority. Maximum
switching capacity of 2 Amps at 24VAC.
24V COM
24VAC Commo
n – Neutral for the 24VAC power supply from the Matrix. This contact can be used in conjunction
with terminal R to provide a power source for a digital thermostat.
NOTICE: 24V COM to the A/C Condenser Unit must be broken by the Matrix AC Freeze-stat included with the
installation package, see Figure 8.2.
