Use and Care Manual

59
WARNING
Ensure the appliance is full of water before ring the burner. Failure to do so will damage the appliance. Such damage IS NOT covered by warranty, and could
result in property damage, serious personal injury, or death.
▪ F. PURGE AIR FROM DHW SYSTEM
▪ G. CHECK THERMOSTAT CIRCUIT(S)
To purge air from the system:
a. Connect a hose to the purge valve and route hose to an area where water can drain and be seen.
b. Close the appliance or system isolation valve between the purge valve and ll connection to the system.
c. Close zone isolation valves.
d. Automatic water replenishment in progress when the Combi Boiler is less than the internal pressure 12psi.
e. Open purge valve.
f. Open the isolation valves one zone at a time. Allow water to run through the zone, pushing out the air. Run water until no noticeable air ow is
present. Close the zone isolation valves and proceed with the next zone. Follow this procedure until all zones are purged.
g. Close the purge valve and remove the hose. Open all isolation valves. ‘Error Code 54’ will be indicated at the beginning of auto feeding.This is
normal operation. When auto feeding is completed, ‘Error Code 54’ turns off automatically. It is recommended that you put the pumps into manual
operation to assist in purging the circuits.
h. Disconnect the wires that are connected to the THERMOSTAT terminals of the terminal block. Apply power to the appliance. After the control goes
through the start-up sequence, the display will turn off.
i. Press and hold the button for more than 5 seconds. Then scroll to 15:CK by turning the dial . Press the button. A.PP will show on the
display. Press the button to run the test pump operation. The default is Maximum 10 minutes for 60sec-on and 10sec-off. Turn the dial
counterclockwise from off to on.
j. The CH and internal circulation pumps will come on. Run pumps as required to help bleed out all entrapped air. Some good indicators that air is
removed include the absence of gurgling noises in the pipes and pump operation becoming very quiet. Test mode will stop automatically after the
Maximum time (xed value is 10 minutes), or press the button to leave it manually.
k. After the system has operated for some time, eliminate any residual air by using the manual air vents located throughout the system.
l. If purge valves are not installed in the system, open manual air vents in the system one at a time, beginning with the lowest oor. Close vent when
water squirts out. Repeat with remaining vents.
1. Make sure CH and DHW lines to the appliance are open and full of water. Turn on all electric power to appliance.
1. Disconnect the two external wires connected to the appliance thermostat terminals (low voltage terminal strip).
2. Connect a voltmeter across these two incoming wires with power supplied to the thermostat circuits. Close each thermostat, zone valve and relay
in the external circuit one at a time and check the voltmeter reading across the incoming wires.
3. There should NEVER be a voltage reading.
4. If a voltage reading does occur under any condition, check and correct the external wiring. (This is a common problem when using 3-wire zone
valves.)
5. Once the external thermostat circuit wiring is checked and corrected if necessary, reconnect the external thermostat circuit wires to the appliance
low voltage terminal strip. Allow the appliance to cycle.
2. Open hot water faucets in the DHW system. Start with the faucets nearest the appliance.
3. Keep faucets open until water runs freely and all air is purged. Then move on to faucets further away from the appliance in the system.
4. When water ows freely from all hot water faucets, DHW purging is complete.