LAARS 9600 CB & HWG - Service Manual User Manual
Page 3
9600 CB & HWG Service Manual
Page 3
SECTION 1.
General Information
1A. Introduction
The Heatmaker 9600 CB condensing boilers and
the Heatmaker 9600 HWG non-automatic circulating
tank water heaters have a dual heat exchanger (H-X)
design. The primary H-X is a copper coil type which
operates in a non-condensing mode. A secondary
stainless steel H-X (economizer) surrounds the primary
H-X to condense water vapor from the flue gases and
extract the maximum amount of heat from the
combustion process. Condensate from the economizer
drains into the bottom of the outer shroud of the boiler
section and into the exhaust duct which provides for
condensate drainage.
Flow rates through the primary H-X are
controlled by a thermostatic diverting valve which
diverts water, as required, from the outlet of the
primary H-X back to its inlet so that the primary H-X
temperature is always maintained above the
condensation temperature of the water vapor in the flue
gases. A circulator is built into the unit to provide
enough head to circulate water through the H-X’s and
to a secondary heating loop or separate hot water
storage tank.
The forced draft premixed combustion system
contains a blower to provide air flow through the unit,
the air inlet and exhaust piping. The cylindrical burner
is provided with an air/gas mixture which is metered
through fixed orifices. A hot surface igniter (glow coil)
is controlled by the Integrated Boiler Control which
also controls the blower, circulator, and gas valve and
provides for burner flame safety.
The Heatmaker 9600 is designed to use 3" PVC*
or ABS DWV pipe or PVC, ABS or CPVC schedule
40 pipe for both air intake and flue material. Vent
terminations are provided with the unit.
* CB / HWG - M2- 250 flue material can only be ABS or CPVC.
(1)
Diverting valve
(2)
Circulator
(3)
Mixer tube
(4)
Exhaust
(5)
Blower
(6)
Gas valve
(7)
Burner
(8)
Economizer
(9)
Combustion coil
(10)
Cold water inlet
(11)
Hot water outlet
(12)
Heat exchanger drain
(13)
Air vent
Figure 1. Heatmaker 9600 Assembly View.