Monitor GF1800 - Combustion Blower (GF3800); Flame Detector; Flue Pipe; Heat Exchanger

MONITOR HEATING SYSTEM
Section 1: Description
1-18 FLAME DETECTOR
An Electrode which detects that the burner has
been ignited, using the flame as a conductor,
instantaneously detects when the flame
extinguishes and shuts down the Automatic
Valve.
1-19 COMBUSTION BLOWER (GF3800)
The Combustion Blower has a two stage intake
fan. The intake fan draws in outside air thru the
flue pipe for internal combustion.
Burner modes control fan speeds and the
Solenoid Damper in the Blower Casing. Those
functions are as follows:
COMBUSTION AIR CONTROL
Bum Mode Fan Speed Solenoid Damper
High High Off (open)
Low Low On (close)
Setting air flow for Solenoid Damper on Low
mode should read 9±0.5 mm H2O for Nat. and
8.4±0.5mmH2OforLP.
1-20 HEAT EXCHANGER
An inlet at the top of the Heat Exchanger permits
the heated air to travel from the Combustion
Chamber into the Heat Exchanger.
An outlet, at the bottom of the Heat Exchanger,
permits combustion by-products to be vented to
the Flue Pipe.
While moving through the Heat Exchanger, the
hot air within the Heat Exchanger heats the
outside metal walls. The hot metal walls, in turn,
heat air that is pushed past the Heat Exchanger
and is circulated into the room. An air baffle,
directly in front of the Heat Exchanger, deflects
the heated air downwards, and out, through the
Louver assembly.
1-21 FLUE PIPE
Flue Pipes are available in three (3) sizes. This
provides the flexibility to meet the installation
requirements for dwelling of various wall
thicknesses.
The Flue Pipe is two Sections, Flue pipe A and
Flue Pipe B. The Flue Pipe A contains a "T" -
shaped fitting consisting of four ports. This side
is mounted on the interior wall of the dwelling.
The Flue Pipe B is vented outside the dwelling.
The Flue Pipe assembly consists of two concen-
tric tubes. Outside air is drawn through the cylin-
drical space between the tubes.
As the cool air enters, it is heated by the hot air
that is exiting the system.
A large-bore, flexible hose connects the air inlet
port on the Flue Pipe A with the Combustion
Blower, a cloth-covered metal pipe connects the
Heat Exchanger with the exhaust outlet on the
Flue Pipe A. For different specs refer to installa-
tion Section page 16.
1-22 AIR CIRCULATION FAN
The Circulation Fan is driven by a two speed
motor and is designed to circulate the heated
room air. If the heater is running in low burn
mode, the fan also runs at low-speed; in high
burn mode, the fan advances to high-speed.
Operation of the fan is controlled by the
Microprocessor and Fan Thermostat Switch.
Physically assembled with a protective wire
cage, the entire fan assembly is secured to a
bracket on the rear of the Heater Cabinet. A
sheet metal conduit, at the rear of the Heater,
protects the fan wiring from damage.
8