NTI Matrix - Matrix Blower Operation

Installation and Operation Instructions Matrix
48
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)
Heat Profile 2 (PF2)
Heat Profile 3 (PF3)
Heating
Stage
CFM
Set Point
(°F)
Air Temp
(°F)
Btu/Hr
Out
CFM
Set Point
(°F)
Air Temp
(°F)
Btu/Hr
Out
CFM
Set Point
(°F)
Air Temp
(°F)
Btu/Hr
Out
1
400
108
104
14000
400
108
104
14000
400
108
104
14000
Actual Output rates may vary from
what is shown
2
550
110
104
19000
550
110
104
19000
550
110
104
19000
3
670
113
105
24000
670
113
105
24000
670
113
105
24000
4
720
117
108
27700
730
122
112
31500
750
128
116
35500
5
760
120
110
31400
790
131
118
39100
820
141
125
47100
6
810
124
112
35100
850
138
122
46700
900
152
132
58700
7
860
127
114
38800
910
145
127
54200
975
163
139
70200
8
900
130
115
42500
970
152
131
61800
1050
172
144
81800
9
950
133
117
46300
1030
158
134
69400
1120
181
149
93400
10
1000
136
118
50000
1100
164
137
77000
1200
190
153
105000
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.