Magikist HWG20, Instruction Manual

-13-

This section is applicable only to heaters which utilize
electronic ignition (HSI).

When there is a request for heat as shown by the
REQUEST FOR HEAT indicator on the 

P

RO

S

AFE

II

control, the 

P

RO

S

AFE

II

control signals the SmartValve

gas valve (hereafter referred to as the SmartValve) to
start the ignition sequence. In response the
SmartValve will begin the pilot trial period, where the
SmartValve attempts to light the pilot for a period of 90
seconds. This 90 second period consists of the the
following sequence: hot surface ignitor (HSI) on for 30
seconds; HSI off for 30 seconds; HSI on for an
additional 30 seconds. If the attempt to light the pilot is
successful during the pilot trial period, the main section
of the SmartValve will then energize for main burner
ignition to occur. If the attempt to light the pilot is
unsuccessful after 90 seconds, the SmartValve will
begin a 5 minute delay period before reattempting
another pilot trial period. The SmartValve is a
continuous retry control. Thus it will continuously
repeat the pilot trial period followed by the 5 minute

delay period, until the pilot is successfully lit or the

P

RO

S

AFE

II

control no longer indicates REQUEST

FOR HEAT.

If after successful lighting of the pilot, the SmartValve
detects that the pilot is no longer lit, it will once again
begin the pilot trial period. If the pilot is not relit after 90
seconds, the SmartValve will begin the 5 minute delay
period. Continuous retry will occur as described above.

The HEAT ON indicator of the ProSafe II control
indicates that the SmartValve gas valve has provided
positive feedback that the pilot is lit and the main
section of the gas valve is open. If the REQUEST FOR
HEAT indicator of the 

P

RO

S

AFE

II 

is lit but the HEAT

ON indicator of the the 

P

RO

S

AFE

II 

is not lit, there is

no indication of what state the SmartValve is in with
regards to it’s continuous retry sequence. In other
words the SmartValve could be in the pilot trial period
(HSI on or HSI off), or the 5 minute delay period.

8.0  ELECTRONIC IGNITION OPERATION