S tart-UpChecklist (l)
6
Connect power supply 220v 15 amp service
Connect room thermostat.
Unlock the pump motor shaft (turn center screw to bleed).
Make sure flue vent is properly installed.
Fill the primary loop (if no DHW storage tank has been installed) slowly until the pressure reaches 1-2 bar.
(If a DHW storage tank has been installed, then fill the secondary loop first).
Open the DHW circuit for it to fill up and vent.
With the gas inlet cock closed, start up the Central Heating/DHW mode (p15 #2). The boiler will per form a
lighting cycle and will then lock out under code 12.
Leave it like that for five minutes so that the pump , which is still running, can help vent the circuit.
Next chec k the pressure level (p14 #1) and top up if it has dropped below 1.5 bar.
Open the gas inlet cock, reset the system ( p14 #5) and the boiler will start operating.
Allow the boiler to operate in the Heating mode for ten minutes , in which period it should be checked that
all radiators warm up. Should one radiator fail to warm up, bleed the air out of it. But if it still does not warm up,
then the flow rates in all radiators should be balanced, alw ays optimizing the pump performance curve
(flow rate/pressure) through its speed selector control (to left of pump - select one of three settings).
Open the DHW tap with highest flow rate in the house. The boiler will operate for ten minutes
continuously at full output. If the flue spillage detection thermostat (p40) does not trip, that
means that the removal of flue gases is correct.
If a gas meter is available ,check the gas supply pressure (p8 & p37 gas supply pressure test point).
The DHW flow can be adjusted if necessary. To do that, open the tap fully and turn the main water inlet flow adjustment
screw (p22) until the leaving water temperature is 120ºF/49ºC (on screen, upper right), at full output.
Laura 20/20F wall-hung waterheaters
