page no. 28 of 40
VPx Range Users, Installation & Servicing Instructions Doc Ref M205 issue 1.2 Nov 2018.
Flame Current
Measurement
2. Minimum current reading is 0.5µA and normal value
should be 1.5µA or higher.
2.6.6.4. Fan Adjustments
The running current of the centrifugal fan must be
checked once the heater is running and compared with
the following table.
Model
Pha
Motor
kW
Typical
Running
Current
Max
Running
Current
VPx35 1 1.1 5.7A 6.8A
VPx50 1 1.1 8.5A 9.8A
VPx70 1 1.4 11.0A 12.0A
VPx90 1 2 x 0.55 6.4A 8.0A*
VPx120 1 2 x 1.4 8.5A 10.0A*
VPx140 1 2 x 1.4 10.0A 10.0A*
* current shown for each fan
WARNING: Exceeding the MAX running
current will cause the fan’s thermal overload
to trip!
Adjust the balancing dampers within the airflow ductwork
system to achieve a current suitable for the model in
question.
2.6.6.5. Limit Thermostat
Limit Thermostat settings:-
VPx (all) = 90°C
Note: VPx35 & 90 - 140 units have a single
limit thermostat whereas VPx 90 to VPx 140
units have two. The second stat is at the
opposing side of the heater to the burner/
controls end. The limit thermostats are wired in series
(either thermostat will shut down the burner).
2.6.7. Air Heater Controls
1. Close the gas service tap and ensure that the gas valve
is heard to close within 1 second and that the lockout light
is illuminated. Note that the heater may attempt five
re-ignitions before going to lockout. Open the gas service
tap and reset the unit from lockout.
2. Check that the room thermostat and all automatic
controls are operating satisfactorily.
2.6.8. Handing over the Air Heater
Hand these instructions to the user or purchaser for
retention and instruct in the efficient and safe operation
of the air heater and associated controls. Adjust the
automatic controls to those values required by the User.
Finally, advise the user or purchaser that, for continued
efficient and safe operation of the air heater, it is
important that servicing is carried out annually.
In the event that the premises are not yet occupied turn
off the gas and electricity supplies and leave instructional
literature adjacent to gas meter.
2.6 Commissioning and Testing
Model 35 50 70 90 120 140
High Fire CO2 % 8.02 8.6 9.15 7.50 8.40 8.72
FGT (nominal) °C 150.5 152.0 158.6 132.0 153.0 128.0
Low Fire CO2 % 4.76 4.9 5.00 4.50 5.00 4.99
FGT (nominal) °C 124.0 120.5 121.7 123.0 121.0 98.4
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