Matrix Blower Operation - NTI Matrix Installation And Operation Instructions Manual

Installation and Operation Instructions

14.0 MATRIX BLOWER OPERATION

Forced Air Heating
The Matrix forced-air heating module is a step-modulated system, which provides varying heat output rates by
adjusting air flow and water temperature through a fan coil.
Table 14-1 Fan Coil Output Chart
Heat Profile 1 (PF1)
Heating Set Point Air Temp
CFM
Stage (°F)
1 400 108
2 550 110
3 670 113
4 720 117
5 760 120
6 810 124
7 860 127
8 900 130
9 950 133
10 1000 136
Example: At stage 4 (Profile 1) the Matrix provides 720 CFM across the fan coil, which is receiving 117°F water from the
boiler. The coil then supplies plenum air at 108° F or ~27700 BTU/hr.
On an initial thermostat call (24VAC @ W1), space heating begins by providing heat at Stage 3 (~24,000
BTU/hr) (if hydronic heat is also calling (24VAC @ H) heating will begin at stage 1) and so long as the
thermostat is not satisfied, incrementally increases to a maximum of Stage 10 (maximum output). When the
thermostat becomes satisfied, an average of the heat output rate during the call is calculated. The boiler remains
lit and the space heat output begins an incremental decrease in heat output rate beginning with the stage just
below the calculated average and ending with either the thermostat re-calling or if the thermostat never re-calls,
the output rate decreases to minimum stage after which the boiler shuts off.
If the thermostat re-calls prior to the minimum heat stage, a new calculated average of the thermostat off cycle is
calculated and the boiler again begins an increasing ramp, only this time it begins at the calculated stage and not
necessarily at the minimum stage.
This computation "hunts" for the heat loss of the dwelling based on the reaction of the thermostat to the rise and
fall of the space temperature and the heat cycle rate of the thermostat.
If at any time the plenum temperature exceeds 160°F, the boiler will stop supplying heat until the temperature in
the supply plenum drops below 140ºF, during which time an AL2 error message will be displayed.
The burner will remain on, and the Matrix will provide heat, when the thermostat is off.
This is normal and is required to provide efficient heat.
48
Heat Profile 2 (PF2)
Btu/Hr Set Point
CFM
(°F) Out (°F)
104 14000 400 108
104 19000 550 110
105 24000 670 113
108 27700 730 122
110 31400 790 131
112 35100 850 138
114 38800 910 145
115 42500 970 152
117 46300 1030 158
118 50000 1100 164
Air Temp Btu/Hr
CFM
(°F) Out
104
14000 400
104 19000 550
105
24000 670
112
31500 750
118 39100 820
122 46700 900
127 54200 975
131 61800 1050
134 69400 1120
137 77000 1200
Matrix
Heat Profile 3 (PF3)
Set Point Air Temp Btu/Hr
(°F) (°F) Out
108 104 14000
110 104 19000
113 105 24000
128 116 35500
141 125 47100
152 132 58700
163 139 70200
172 144 81800
181 149 93400
190 153 105000