Service manual

G.Fire Service Manual 27 Issue A — © Masport, March 2004
WHITE
BLUE
RED
BLACK
GRN/YEL
IGN
E
WHITE
BLUE
RED
BLACK
GRN/YEL
WHITE
BLUE
RED
BLACK
GREEN
CONTROL BOX
CONNECTOR
CONNECTORS
FAN BOX
FAN
ECS II FAN LOOM WIRING
EARTH
(Fan Box)
LOW
MED
HIGH
7. EIS INFORMATION
7.1 BASIC DESCRIPTION
The EIS system is an Electronic Ignition System which lights the fire each time heat is required.
There is no pilot light, so economies in gas consumption can be significant. The basic system is
illustrated below.
VALVE
FLAME SENSOR
SPARK
ELECTRODE
FAN
THERMODISC
EARTH
ELECTRODE
FASCIA
EARTH
WIRE
CONTROL
BOX
THERMO-
STAT LINK
EIS SCHEMATIC ELECTRICAL LAYOUT
CONTROL
PANEL
MAINS IN
9 PIN PLUG
MODULATOR
LEAD
6 PIN PLUG
Blue
Yel
Vi
Red
Blk
Blk
VALVE LEAD
FIRE
OFF/ON
FIRE
LO/HI
FAN
LO/OFF/HI
This system has no remote control, but it can utilise a wall mounted thermostat to maintain the
required room temperature.
The CONTROL BOX is mounted in the bottom right hand corner of the cabinet surrounding the
firebox. It contains a transformer which feeds the 24 volt thermostat circuit. This circuit, through a
relay, switches the mains supply to the valve to initiate the flame starting sequence.
The THERMOSTAT TERMINALS are on the front of the control box. If a thermostat is not fitted,
these terminals must be shorted by a jumper wire.
The VALVE initiates a spark at the igniter terminals after a deliberate delay of a few seconds. If the
flame does not light within about 30 seconds, the FLAME SENSOR detects this, and the spark
ceases. To reset the system for a further ignition attempt, it is necessary to switch off the mains
supply to the control box.
The SWITCH CLUSTER, mounted on the left side of the fascia, signals the control box to initiate
ignition (if the thermostat will allow it), as well as providing a HIGH/LOW control for the flame
height, and OFF/LOW/HIGH control of the fan speed.
The THERMODISC controls the fan in the usual way, delaying the fan start until the firebox has
heated, and allowing the fan to continue running after the fire is extinguished until the firebox has
cooled. Some Thermodiscs are mounted at the rear of the firebox (accessible through the fan access
panel), while others are mounted under the right front floor of the burner tray.