Enviro 50-1472 用户手册

39

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