Ideal Isar m30100 Sequence of operation
Boiler Operation (from cold) Initial Power Up
Note: It is essential that there is no call for CH from any of the controls (including the red link wire supplied with the boiler mains plug) during the Initial Power Up period.
When the mains supply (230 Vac) is applied to (L3) the display will show 5. Approximately 3 seconds later the display will show d and the boiler will ignite. A green LED will confirm detection and the boiler will fire at maximum rate for approximately 15 seconds. At this point the motorised valve will be in the DHW position (lever forward). This short burn time is designed to raise the temperature in the plate heat exchanger, which will allow a temperature drop when a tap is turned on.
If the boiler does not ignite on this first attempt the display will show 0 and there will be a delay of approximately 2 minutes before the boiler attempts to fire in pre-heat mode.
Pre-heat
If the temperature of the thermistor in the plate heat exchanger is allowed to drop below 35 ° C (either because of an extensive time without demand or after an Initial Power Up) the display will show t and the boiler will ignite. A green LED will confirm detection and the boiler will fire at just above minimum rate for approximately 2 minutes. At this point the motorised valve will be in the DHW position (lever forward). The boiler will then revert to standby and the display will then show 0.
DHW
When a tap is turned on, the thermistor, which is positioned in the plate heat exchanger, will experience a drop in temperature. The display will then show d and the boiler will ignite. A green LED will confirm detection and the boiler will fire at maximum rate. At this point the motorised valve will be in the DHW position (lever forward).
The fan will now modulate up or down to maintain the DHW outlet temperature (the boiler will modulate at approximately 3 ° C below the DHW set point, and will extinguish if the outlet temperature remains above the set point for more than 1 minute).
When the tap is turned off, the boiler will continue to fire until the thermistor, which is situated in the plate heat exchanger, experiences a rapid increase in temperature. The green LED will then extinguish and a 5 second pump over-run will occur. The boiler then goes to standby and the display reverts to 0.
Note: If a tap is turned on during CH operation, the boiler will not ignite in DHW mode until the return temperature is 5 ° C below the DHW set point.
Boiler Operation (from cold)
CH
When the system controls are calling for heat (L1 to L2) the display will show c with a green flashing LED. The fan will run at 90% maximum CH rate and after 5 seconds the ignition will commence, 1 second later the gas valve will operate and the PCB has 4 seconds to detect ionisation. When detection takes place the LED will be solid. At this point the motorised valve will be in the CH position (lever back).
The fan will increase to maximum rate until the flow temperature reaches 3 ° C below the CH set point. The fan will then modulate down to suit the heating load. The boiler will switch off at approximately 2 ° C above the CH set point. Ignition will take place at 5 ° C below the minimum modulating temperature.
When the system controls are switched off, the pump will over-run for approximately 5 minutes and the display will show c.
If the temperature goes above the maximum temperature, the display will show c with a flashing green LED until the temperature falls below the set point.
Note: If the PCB does not detect an ionisation current within 3 seconds the boiler will reattempt ignition. There will be a total of 3 ignition attempts and the fan will run for a post purge period of 5 seconds between each ignition attempt. If ignition is not detected, the boiler will lockout (see sheet).
