Munchkin Gas-Fired Hot Water Circulating Heater - Manual (Page 58)

57
GAS-FIRED HEATER
Installation Manual
PART 13: START-UP PROCEDURES WITH THE VISION 1 OPTION
(CONTINUED)
Default Function
Function Value Description
14 30 Min. Allows the installer to set the
Maximum run time for the Indirect
Fired Water Heater and the
Minimum run time for Central
Heating. Range 0 to 60 Minutes
15 0 Bus address (0=zone master 1–8
— cascade slave) (Not currently
used.)
16 0 Interface Board Activation
0 = not active
1 = active
WARNING: Never change the de-
fault setting without the Munchkin
Interface Board installed.**
17 0 Interface Board Function
0 = Building Management
1 = Enables Tekmar Modulating
control.
(Consult with Tekmar to assure
the Tekmar Control is compati-
ble)
18 1 Step Modulation – Regulates the
burner output in 6 steps in one-
minute intervals. This reduces
short cycling.
1 = on
0 = off
19 180° Indirect heater set point (flow)
Temperature default = 119° to
180°
20 1 Not applicable
* Central Heating Curve Function
The central heating demand is detected when
the room thermostat closes. When an outside
sensor is also connected, the supply tempera-
ture will depend on the factory default central
heating curve.
To set your heat curve you will have to set the
following parameters
1. Minimum outside design temperature:
Function 8
2. Design Supply water temperature at the
minimum design outside temperature:
Function 9
3. Maximum outside design temperature:
Function 10
4. Design Supply water temperature at the
maximum outside temperature: Function 11
NOTICE
It is important to note that the homeowner can
adjust the heat curve down by adjusting the
central heating temperature to a lower setting.