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Sales/Spares & Replacement Help Line 01604 752881
12.
OPERATING MODES
12.1
HIGH TEMPERATURE MODE
12.1.1 For high temperature mode the J1 pins 1 + 2 has NO jumper.
12.1.2 With a thermista-stat connected (see note*), the fan will run when a water temperature of 60°C is
reached and stops when the water temperature falls to 42°C. The fan speed is controlled by the
thermista-stat demand.
12.1.3 With no thermista-stat connected, the fan will run when a water temperature of 44°C is reached, the
fan speed is controlled by the water temperature. The maximum fan speed reached when the water
temperature is at 60°C.
12.2
LOW TEMPERATURE MODE
12.2.1 For low temperature mode J1 has a jumper across pins 1 + 2.
12.2.2 With the thermista-stat connected, the fan will run when a water temperature of 33°C is reached and
stops when the water temperature falls to 20°C. The fan speed is controlled by the thermista-stat
demand.
12.2.3 With no thermista-stat connected, the fan will run when a water temperature of 22°C is reached, the
fan speed is controlled by the water temperature. The maximum fan speed reached when the water
temperature is at 32°C.
NOTE: Thermista-stat to be ordered separately.
13. COMMISSIONING
13.1
Ensure the heater is correctly fitted with water and all air vented from the flow and return circuits.
13.2
Switch on electrical supply.
13.3
Setting maximum speed.
Make a short across thermista-stat connections, if fitted, and adjust the fan speed as required, remove the short.
13.4
Setting minimum fan speed.
Make a short across the pipe sensor and adjusted the fan speed as required, remove short.
13.5
WITH THERMISTA-STAT FITTED
13.5.1 Turn up thermista-stat to call for heat.
13.5.2 Check for 230V on switch live out.
13.5.3 With the water at the required temperature ensure fan starts
13.5.4 Allow the system to warm up and check temperature rise across unit is 40°C.
13.5.5 Set water differential to 20°C using lock shield valve or equivalent.
13.5.6 Turn off thermista-stat and check there is NO 230V on switch live out.
13.5.7 Check fan stops when water cools to required temperature.
13.6
WITH NO THERMISTA-STAT FITTED
13.6.1 With the water at the required temperature ensure fan starts.
13.6.2 Allow the system to warm up and check temperature rise across unit is 40°C.
13.6.3 Set water differential to 20°C using lockshield valve or equivalent.
13.6.4 Check fan stops when water cools to required temperature.
14.
SERVICING & MAINTENANCE
14.1
ROUTINE MAINTENANCE
IMPORTANT: Before carrying out any work on the unit, ALWAYS ENSURE THAT IT IS ISOLATED FROM
THE MAINS ELECTRICAL SUPPLY.
Remove the filter and unscrew the two retaining screws holding the front cover on the unit, gently pull it forward.
Maintenance should be carried out at least once per year.
14.1.1 Check that the heat exchanger airways are free from obstructions. If necessary, clean with a
vacuum cleaner from the air inspection panel, taking care to not damage the airways.
CAUTION: THE ELEMENTS OF THE HEAT EXCHANGER ARE VERY FRAGILE.
14.1.2 Check the condition of the external strainer, cleaning as necessary.
14.1.3 Check that the air filter is being regularly cleaned in accordance with the User’s Instructions.
14.2
PCB REPLACEMENT
Ensure that the electrical supply is switched off and isolated.
