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3
GENERAL REQUIREMENTS
3.1 Terminal position for fan assisted appliance
Key
Location
A
Below an opening (window, air-brick, etc.)
B
Above an opening (window, air-brick, etc.)
C
To the side of an opening (window, air-brick, etc.)
D
Below gutter, drain-pipe, etc.
E
Below eaves
F
Below balcony, car-port roof, etc.
G
To the side of a soil/drain-pipe, etc.
H
From internal/external corner
I
Above ground, roof, or balcony level
J
From a surface or boundary facing the terminal
K
From a terminal facing a terminal
L
From an opening in the car-port into the building
M
Vertically from a terminal on the same wall
N
Horizontally from a terminal on the same wall
P
From a structure to the side of the vertical terminal
Q
From the top of the vertical terminal to the roof flashing
R
To the side of a boundary
S
To the side of an opening or window on a pitched roof
T
Below an opening or window on a pitched roof
V
From a vertical terminal to an adjacent opening (window, air-brick, etc.)
W
From a vertical terminal to an adjacent vertical terminal
3.2 Principle components
- A fully integrated electronic control board featuring electronic temperature control, self diagnostic fault indicator, continuous gas modulation.
- Electronic ignition with flame supervision.
- Fan.
- Differential air pressure switch.
- Two-stage gas valve.
3.3 Mode of operation
When there is a request for hot water via a hot water outlet or tap, the water flow switch senses water movement thereby energizing the fan, the
fan proves the differential air pressure switch which in-turn allows an ignition sequence to begin.
Ignition is sensed by the electronic circuitry to ensure flame stability at the burner. Once successful ignition has been achieved, the electronic
circuitry increases the gas rate to maximum or modulates to suit the set requirement.
When the appliance reaches the desired temperature the burner will modulate to maintain the desired temperature. Should the temperature
continue to increase, the burner will shut off when the maximum operating temperature is attained.
When the request for hot water has been satisfied the appliance fan may continue to operate to dissipate any residual heat within the appliance.
3.4 Safety devices
When the appliance is in use, safe operation is ensured by:
- a high limit thermostat that over-rides the temperature control circuit to prevent or interrupt the operation of the burner;
- a differential air pressure switch that checks the operation of the fan and flue thereby allowing safe operation of the burner;
- a flame supervision device that will shut off the gas supply to the burner when no flame signal is detected.
25 mm (60mm for 80/125 - 5" flue)
25 mm (60mm for 80/125 - 5" flue)
As determined by the fixed collar
of the vertical terminal
(call Vokera technical for advice)
300 mm (only if both terminals are the same height)
7
Minimum distance
300 mm
300 mm
300 mm
25 mm
25 mm
25 mm
300 mm
600 mm
1200 mm
1200 mm
1500 mm
300 mm
300 mm
300 mm
600 mm
2000 mm
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