Enviro Sonnet C-11253 - Manual (Page 39)

39
Possible Cause Solution
Spark will not light
the pilot after
repeatedly pressing
the spark ignitor.
Air in the pilot supply line. • Purge the line or start ignition several times.
No spark at pilot burner • Check spark gap.
• Check wiring connections to ignitor.
• Check for spark in location along cable.
Valve. • Replace the valve.
Over tightened
thermocouple interrupter.
• Replace the valve and thermocouple interrupter.
Receiver • Replace the receiver and reset the receiver’s
code, refer to M
AINTENANCE
A
ND
S
ERVICE
-
C HANGING R EMOTE H ANDSET C ODE .
Pilot is lit and
control continues
to spark. Valve
shuts off after 10 to
30 seconds. Valve
operates manually.
Receiver. • Replace the receiver and reset the receiver’s
code, refer to M AINTENANCE A ND S ERVICE -
C
HANGING
R
EMOTE
H
ANDSET
C
ODE
.
Pilot is lit and
sparking stops. Valve
shuts off after 10 to
60 seconds. Valve
does not operate
manually.
Note: For manual
operation turn the
valve knob to the
manual position
and hold the safety
magnet open
with a pen for
approximately 60
seconds (see Figure
91).
Not enough voltage
generated from the
thermocouple or too much
resistance in the circuit.
Note: To find which part of
the circuit is causing the
problem, a checklist for
each application can be
prepared using an Excel
calculation available from
Mertik Maxitrol.
Possible parts are: ON-
OFF switch, Temperature
switches, Thermo current
connections, Receiver.
• Use a digital multimeter set in the mV range
and measure the voltage by touching one test
lead to the metal body of the valve and the
other lead will go to the spade connector of the
thermocouple line (see Figure 82). The available
voltage must be at least 5mV. Drop time can
be measured after the thermocouple is fully
heated; more than 15 seconds for the drop time
is good.
Thermocouple. • Replace the thermocouple.
Low inlet pressure. • Confirm the regulator’s pressure and sizing.
Replace if necessary.
Valve. • Replace the valve. Do not over tighten the
thermocouple interrupter.
BV Only: Spill switch at
the draft hood may have
tripped.
• Correct cause of trip and reset switch.
Trouble Shooting
Figure 82: Voltage Across
Valve & Spade.
Figure 81: Valve’s
Safety Magnet.