38
Matrix Installation and Operation Instructions
Call for Heat (24VAC @ W1):
Normal Thermostat call, Matrix operates as a step-modulating furnace as described above. If
HRV set to ‘ON’, HRV will operate at the low (continuous) ventilation rate.
Call for Auxiliary Heat (24 VAC @ W2):
When calling, furnace will provide heat at a stage 10 output rate. With a call for
auxiliary heating the Matrix will function as a single stage, full fire appliance. This means the burner will come on with a
thermostat call and go off when the call is satisfied. If HRV set to ‘ON’, HRV will operate at the low (continuous) ventilation rate.
Outdoor Sensor:
The auxiliary heating function (24VAC @ W2) will utilize the outdoor sensor if available. The outdoor reset
function is not used for W1 heating.
This function is also active during a hydronic heat demand (24VAC @ H).
Plenum Sensor:
The Matrix is equipped with a plenum temperature sensor that must be field installed in the supply plenum and
wired to the furnaces external terminal strip. When installed the Matrix fan control displays the plenum temperature and will use it
to detect problems in the supply of heat to the space.
Call for Circulating Fan (24VAC @ G)
:
Matrix operates at the programmed air circulation rate according to the “FAN” setting
in the Fan (blue) controller (400-1600 CFM)
.
If HRV is set to ‘ON’ (See 8.2 Fan Controller), the HRV will ventilate at the low
(Continuous) ventilation rate.
Call for Dehumidification (24VAC @ DH)
:
Matrix operates at the minimum air circulation rate (400 CFM)
.
HRV will
ventilate at the high (Override) ventilation rate.
Call for Cooling Fan (24VAC @ Y1):
Matrix operates at the prescribed air circulation rate (Y1x10 CFM – See 8.2 Fan
Control). HRV will not operate during a call for cooling unless there is a concurrent call for DH – Dehumidification or G –
Continuous and HRV is set to ON.
Call for Cooling Fan (24VAC @ Y2):
Matrix operates at the prescribed air circulation rate (Y2x10 CFM – See 8.2 Fan
Control). HRV will not operate during a call for cooling unless there is a concurrent call for DH – Dehumidification or G –
Continuous and HRV is set to ON.
10.2 Duct Sizing
When sizing ductwork, a maximum flow velocity of 800 fpm is
desired. Table 11 shows common duct sizes at specified flows. The
maximum flows that can be expected are shown in Table 10.3. It is
important to maintain the return plenum pressure as low as possible.
Keeping this ductwork as free flowing as possible will offer more
supply static pressure to overcome A/C coils, closed registers etc while
maintaining constant flow.
Any additional filtration, humidification, or de-humidification
equipment should be installed external to the return or supply ducts so
not to create additional restriction.
Table 10.3 Maximum Air Flow Rates
Fan Control Setting
Heating
(HEA)
Cooling
(COO)
ESPmax*
CFM
160 max
.35 inwg
1600
160 max
.6 inwg
1500
160 max
.75 inwg
1400
120
(3
Ton)
1200
80 (2 Ton)
800
PF3
No Cooling
<1 inwg
1200
PF2
No Cooling
<1 inwg
1100
PF1
No Cooling
<1 inwg
1000
Example #1
No cooling function with Heating
profile of PF2 selected. Maximum airflow will be
1100 CFM.
Example #2
Cooling set to 800 CFM for 2 tons of
cooling with Heating profile of PF3 selected.
Maximum airflow will be greater of cooling or heating
function. Maximum 1200 CFM.
*Measured from return plenum to supply plenum prior to A/C coil.
ECM motor can produce near constant flow provided horsepower or
maximum speed of motor is not exceeded.
Airflow
(CFM)
Area
(sqft)
Duct Sizing
(inches)
1600
2 24x12
20x16
1200
1.5 24x10
20x12 18x12
1000
1.25 20x10
18x10
16x12
800
1
18x8
16x10
12x12
Table 10.2 Duct Size vs. Air Flow
Based on 800 fpm max airflow velocity
