Supplied By www.heating spares.co Tel. 0161 620 6677
24
6.29
CONDENSE TRAP REMOVAL fig. 36
Carry out component removal procedure as de-
scribed in 6.4.
Disconnect the flexible condense pipe (1) from
the condense trap. Locate and remove the con-
dense pipe locking pin and disconnect the con-
dense pipe (2) from the condense trap. Locate
and disconnect the condense pressure switch
pipe from the condense trap (3). Carefully re-
move the condense trap. Replace in the reverse
order.
7.1
CHECKING APPLIANCE OPERATION
When carrying out any repairs or servicing to the
appliance, the relevant commissioning proce-
dure must be undertaken to ensure the continued
safe operation of the appliance. Particular atten-
tion should be made to ensure gas soundness,
water soundness and the electrical integrity of the
appliance.
7.2
APPLIANCE MODE OF OPERATION
NOTE
There must be sufficient system water pressure
(min. 0.5 bar) to ensure the water pressure switch
is activated. If there is insufficient system pres-
sure the pump and fan will be prevented from
operating.
7.2.1
SELECTOR SWITCH IN THE OFF POSITION
When the selector switch is in the OFF position,
the Green LED status indicator will flash every 6-
seconds to confirm the appliance is in standby
mode. The divertor valve is in the DHW position.
The appliance will not respond to any DHW or
heating requests.
Active functions:
●
●
●
●
●
frost-protection system
●
●
●
●
●
pump anti-block
●
●
●
●
●
valve actuator anti-block
●
fan over-run.
7.2.2
SELECTOR SWITCH IN THE HOT WATER
ONLY POSITION
When the selector switch is in the HW only
position, the Green LED is illuminated:
●
●
●
●
●
flashing every 6-seconds if no DHW request is
active
●
●
●
●
●
constant during a DHW request.
The divertor valve is in the DHW position. The
appliance will respond to any DHW requests.
Active functions:
●
●
●
●
●
frost-protection system
●
●
●
●
●
pump anti-block
●
●
●
●
●
valve actuator anti-block
●
●
●
●
●
fan over-run.
7.2.3
SELECTOR SWITCH IN THE HEATING & HOT
WATER POSITION
When the selector switch is in the heating & HW
position, the Green LED is illuminated:
SECTION 7 CHECKS, ADJUSTMENTS AND FAULT FINDING
●
●
●
●
●
flashing every 6-seconds if no Heat or DHW
request is active
●
●
●
●
●
constant during a heat or DHW request.
The divertor valve remains in the DHW position if
no heat request is active. The appliance will
respond to any heating or DHW requests.
Active functions:
●
●
●
●
●
frost-protection system
●
●
●
●
●
pump anti-block
●
●
●
●
●
valve actuator anti-block
●
●
●
●
●
fan/pump over-run.
7.2.4
APPLIANCE FUNCTIONS
●
●
●
●
●
Frost-protection:
this function is only active
when there are no requests for heating or HW.
When the temperature of the primary thermis-
tor drops below 5 °C, the valve actuator will
motor to the heating position, whereupon the
boiler will operate on minimum power until the
temperature of the primary thermistor reaches
35 °C. Thereafter the pump will over-run for 30-
seconds.
●
●
●
●
●
Anti-block cycle:
when there has been no
heating or HW request for 19-hours, the anti-
block cycle is activated. The valve actuator will
motor from the DHW position to the heating
position and then motor back to the DHW
position. Thereafter the pump will be activated
for a period of 30-seconds.
●
●
●
●
●
Fan over-run:
should the temperature of the
primary thermistor exceed 78 °C after a heating
or DHW request, the pump and/or fan will run
for a period of 30-seconds.
●
●
●
●
●
SARA function:
the SARA function permits
the boiler (when the set-point is within the
SARA range) to automatically adjust (raise) the
heating flow outlet temperature should the room
thermostat contacts remain closed for more
that 20-minutes.
7.2.5
DHW MODE fig. 37
With the selector switch in the Heating & HW
position, or HW only position and a DHW outlet is
opened, the appliance will operate in the HW
mode. The valve actuator will motor to the HW
position (if a heating request was active) and the
pump and fan will be active. The operation of the
fan causes the air pressure switch to deliver a
Fig. 36
