LAARS HP-M2 Series - Installation, Operation and Maintenance Instructions - Manual (Page 4)

Page 4 LAARS Heating Systems
SECTION 1
General Information
1A. HW Series, H Series, HP Series
The H Series boiler is a low pressure, hot water
boiler that is available in two (2) design
configurations. The HW series provides domestic hot
water as well as hydronic space heating. It includes an
insulated storage tank through which boiler water is
circulated. A heat exchanger within the tank transfers
heat from the boiler to the domestic hot water. The H
and HP series boilers are designed to provide hot
water for space heating, and can be plumbed to an
indirect water heater to supply domestic hot water.
By replacing the air and the gas orifices, the
basic H Series boiler has the flexibility to operate on
either natural or LP gas and may be fired at 60,000,
100,000 or 130,000 BTU/HR input. The H Series can
be direct vented by utilizing an optional concentric
vent system that will provide outside air for
combustion. H(W)(P)-60,100 & 130 appliances may
also be vented with 3" or 4" diameter stainless steel
horizontal / vertical venting as described on page 6.
The maximum length shall not exceed 50 equivalent
feet of 3" diameter or 100 equivalent feet of 4"
diameter. H(W)(P)-M2-130 appliances may also be
connected to a lined internal chimney.
The H Series features a forced draft, pre-mixed
combustion system. All air for combustion is supplied
with the gas to the burner (flameholder). Both the
intake air and the gas are metered through separate
orifices before entering the combustion air blower.
The blower forces the air/fuel mixture through the
flameholder and into the combustion chamber. The
mixture is ignited from the hot surface igniter and
burns. Hot gases are forced out between the passes of
the heat exchanger into the flue collector. Flue gases
are discharged into the outside atmosphere through the
vent terminal, a chimney, horizontal or vertical
alternate vent.
Model H(W)-M2-60 & H(W)-M2-100 UNITS
MUST NOT BE CHIMNEY CONNECTED.
Installations with water containing 10 grains of
hardness or higher, must be installed with appropriate
water treatment.
1B. To the Installer: Before You Begin
The H Series is uniquely different from any
heating boiler you have installed in the past. It is
important for you to take a few minutes to review the
contents of the Installation and Operating section of
this manual before you begin installation. This will
avoid making mistakes and causing confusion when
installing and operating the unit.
1. Gas Burner*
2. Sealed Combustion* w/ P/N 2400-236 or
2400-238
3. Outside Vent Wall*
4. Outside Air For Combustion*
5. Copper Coil Heat Exchanger*
6. Thermostatic Union (H-M2)
7. Domestic Hot Water Coil (HW(D)-M2)*
8. Heating System Water Outlet
9. Heating System Water Return
10. Gas Supply
(*see Figure 1)
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Figure 1. HW-M2.
OUT OF
PRODUCTION