Keston Thermomatic RSM20/FB, Инструкция по установке и обслуживанию, Страница: 25 / 46

Page 25
Fig. 7.2. CONDITION 2.
The fan motor
starts, does the
burner light up?
Are the connection pipes
to the pressure sw itch
squashed, inverted or
disconnected?
Restore the proper
connection according to the
identification clour
Is there an obstruction at
the outlet of the flue gas
pipe or the air intake pipe?
Clear the pipes.
Does the differential
pressure sw itch (DPS)
give consent of air
pressure and close the
circuit C - No?
Does the fan make few turns
Is there current
(240V) at the fan
motor?
Check the electrical
supply or the 3A fuse.
Is control box faulty? Replace control box.
Faulty DPS., replace it.
No
Yes
No
No
Yes
No
No
Yes
Yes
Yes
No
See condition 3
Yes
Fig. 7.3. CONDITION 3.
Faulty control box
Check the electrical
connections referring
to wiring diagram:
Earth
Live
Neutral
Does the valve let
the gas pass
through?
Does the gas
reach the valve?
Verify if the connection cable is disconnected.
Check the electrode position comparing to the
burner (it must not touch the burner). If
necessary replace the electrode.
The fan motor starts and the
red light on the instrument
panel comes on. Does the
burner light up?
Wrong electrical connections?
Check that the proper
gas procedure reach tap
2 on gas valve (see gas
valve draw ing fig 5.1)
Is there voltage
(240V) at the gas
valve?
Is there a spark
from ignition
electrode?
Yes
Is the main gas
cock open?
Open it.
Check that there is the proper gas pressure at
valve outlet (tap 6 - gas valve draw ing fig 6.1) If
necessary remove the closing cover and adjust
the gas pressure acting on screw 3.
Faulty gas valve. Replace it.
No
Check the gas valve connections and. if necessary
replace control box.
Does the control box give the
ignition spark?
Replace control box
Check that the ignition probe (IP) cable is not disconnected.
Position properly IP w ith respect to the burner, avoiding any
contact w ith the metal parts. Is IP operating regularly?
Replace IP
Check control box connections. If
necessary replace control box.
Yes
Yes
No Yes Yes
No
No
No
No
No
No
Yes
Yes
Yes
No
No