LAARS HEATING SYSTEMS
Page 4
HOT
HOT
number for the drafthood is on the heater rating plate.
Follow this procedure to make the conversion:
a.
Remove the top filler plate, stamped “HOT”, by
slipping a fine-blade screwdriver into the slot at
the rear of the plate and gently prying it up (see
Figure 2).
b.
Remove the two screws attaching the adapter
plate to the top assembly and lift it out (see
Figure 3).
c.
Remove the vent cap or drafthood from its
package.
SECTION 2.
Installation Instructions
2A. General Information
WARNING
Follow local regulations with respect to installation
of carbon monoxide (CO) detectors and
manufacturer's maintenance schedule of the
heater.
Install the VW-PW heaters in accordance with
the procedures in this manual (or the Laars warranty
may be voided), local codes and ordinances. In the
absence of such codes, install the heaters in accordance
with the latest edition of the National Fuel Gas Code,
ANSI Z223.1. In Canada, the installation must be in
accordance with CAN1-B149.1 or .2 and local codes.
The authority having jurisdiction may require the
installation conform to the Standard for Controls and
Safety Devices for Automatically Fired Heaters,
ANSI/ASME CSD-1. Any changes to the heater, gas
controls, gas orifices, wiring or draft diverter may void
the warranty. If field conditions require a change to
any of the above, consult the factory.
All gas-fired products require correct installation
to assure safe operation. The requirements for heaters
include the following:
1.
Field assembly of drafthood or vent cap (see
Section 2B).
2.
Appropriate site location (clearances) and
flooring.
3.
Sufficient combustion and ventilation air.
4.
Adequate venting of combustion products.
5.
Adequate water flow.
6.
Properly sized gas meter and piping.
7.
Proper electrical wiring.
This manual provides the information needed to
meet these requirements. Review all application and
installation procedures completely before continuing
the installation.
2B. Field Assembly
The VW-PW heater is shipped from the factory
with the top assembly in the low-profile configuration
for outdoor installations.
The VW-PW heater is design certified for indoor
installation when equipped with a special drafthood,
which must be installed without modification. The part
Figure 2. Top filler plate.
Figure 3. Adapter plate.
Figure 4. Flue transition
Figure 5. Vent cap with
ring.
adapter plate
(outdoor).
Figure 6. Drafthood with
Figure 7. Drafthood switch
adapter plate
receptacle.
(indoor).
