NTI Matrix - Page 44

Installation and Operation Instructions Matrix
44
Operation and Set-up
The Matrix employs a pneumatic modulation system. This modulation system increases or decreases the velocity
of the combustion blower, to meet the demand for heating. The gas valve senses this change in blower pressure
and introduces the required amount of gas to ensure correct combustion. The (Red) Boiler Controller reads the
boiler water temperature, compares it to the set point, and adjusts the burner firing rate accordingly by varying the
speed of the combustion blower.
The (Blue) Fan Controller communicates the appropriate demand and temperature set point to the (Red) Boiler
Controller via a series of digital and analog inputs. Tables 13-3(a) and 13-3(b) show the Boiler Controller’s
response to each demand. For more information on ‘RESET MODE’ see section “Outdoor Sensor (10K)”.
Table 13-3(a) Operation – Conventional Mode
Standby/Storage
Mode
Primary
Forced Air
Call (W1)
Auxiliary
Forced Air
Call (W2)
Shared Call
Forced
Air/Hydronic
Hydronic
Demand (H)
DHW
Demand
Condition
Storage
Off
Storage
On
Heat (W1)
Aux Heat
(W2)
Shared (W1/W2
and H)
Hydronic Call
Domestic
Only
Set Point
-
160°F
SP
Note 1
HI
Greater of SP/ HI
and HYD
HYD
H2O to
H2O+30
Burner On
-
140°F
SP
Note 1
HI
Greater of SP/HI
and HYD
HYD-DIF
H2O+30
Burner Off
-
180°F
210°F
210°F
210°F
HYD + 10
210F
Heat Circ.
Off
On
On
On
On
On
On
Table 13-3(b) Operation – Reset Mode
Standby/Storage
Mode
Primary
Forced Air
Call (W1)
Auxiliary
Forced Air
Call (W2)
Shared Call
Forced
Air/Hydronic
Hydronic
Demand (H)
DHW
Demand
Condition
Storage
Off
Storage
On
Heat (W1)
Aux Heat
(W2)
Shared (W1/W2
and H)
Hydronic Call
Domestic
Only
Set Point
-
160°F
SP
Note 1
HI
Calc.
Greater of SP/ HI
Calc.
and HYD
Calc.
HYD
Calc.
H2O to
H2O+30
Burner On
-
140°F
SP
Note 1
HI
Calc.
Greater of SP/ HI
Calc.
and HYD
Calc.
HYD
Calc.
-DIF
H2O+30
Burner Off
-
180°F
210°F
210°F
210°F
HYD
Calc.
+ 10
210F
Heat Circ.
Off
On
On
On
On
On
On
Note 1: SP (Setpoint) received from Matrix Fan Controller.