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5.5 High limit protection
5.5.1 T max. Heat exchanger
The unit contains 2 temperature protections. The NTC thermostat monitors the air temperature
electronically. Should the temperature, as a first step, become too high, the burner will modulate
to the minimum input and the system fan will modulate to the maximum speed.
When the temperature still increases, the burner will switch off. The display will show E05 / E36.
When the heat exchanger has been cooled to normal levels the burner will start automatically.
Should the temperature increase to an unacceptable level, the heater stops. The display will
show L31. Only after a manual reset the heater can start again. Manual reset can be done on
the electronic circuit board or with the special Winterwarm Room thermostat
5.6 Flue Transport Supervision
The unit is provided with a pressure switch to control the transport of combustion air through the
heat exchanger. It checks in the pre purge phase if there is sufficient movement of combustion
air through the heat exchanger by measuring the pressure difference over the heat exchanger.
If the pressure difference is too low in the pre purge phase, the fault L14 will occur. This could
mean that combustion air is leaking from the heat exchanger and so the heat exchanger must
be checked on leakage.
6
Putting into operation and adjustment
6.1 General
Prior to packaging, each unit is checked in detail on safety and functioning. It is adjusted to the
right efficiency of combustion. In general, the heater does not need to be adjusted after
installation, only a check of functioning is necessary. Also obtain a flue gas analysis and record
it for later reference.
Use only a calibrated instrument !
The CO2 value can be adjusted if the CO2 reading differs 0,3% from its setting. Do not ever
turn injudiciously the adjusting screws!
Adjustment of the gas control without a supporting flue gas analysis will invalidate the warranty.
Once the unit is installed according this manual, the unit can be put into operation. Make sure
the gas pipe is clean, gastight and free from air.
Switch on the electric supply with the maintenance-switch, and open the door in order to be able
to observe the first start-up and so become familiar with the functioning of the heater.
Should the gas line not be purged correctly the heater will attempt to start twice before going
into a lock-out condition. Manual reset is necessary in that case.
Do not forget to instruct the end user about a safe use of the heater (presence of gas, place of
the manual gas valve !), the operation of the heater (lock-out indication and reset) and about the
necessary maintenance. This manual must be left with the end user.
6.2 Start by using the thermostat
Put the thermostat in the highest position. The start sequence is always the same
NOTE:The heater will always burn for minimum 4 minutes before it switches off.
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Instructions condensing Air heaters type XR version XR-GB-4001-a
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