LAARS Mighty Therm VW (Sizes 2000-5000) - Installation, Operation and Maintenance Instructions - Manual (Page 3)

Page 3 Mighty Therm Volume Water Heaters
SECTION 1.
General Information
WARNING
The Model VW Volume Water Heater must be
installed in accordance with the procedures outlined
in this manual. Warranty does not apply to heaters
not installed or operated in accordance with these
procedures. Consult local building and safety codes
before proceeding with work. The installation must
conform to the requirements of the authority having
jurisdiction or, in the absence of such requirements,
to the latest edition of the National Fuel Gas Code,
ANSI Z223.1, and/or in Canada, CANI B-149
requirement.
When required by the authority having
jurisdiction, the installation must conform to
American Society of Mechanical Engineers safety
code for controls and safety devices for automatically
fired heaters No. CSD-1, and in Canada CGA 3.3.
Any modification to the water heater, its gas controls,
gas orifices, wiring or draft diverter may void the
Laars warranty. If field conditions require such
modifications, consult factory.
1.1 Introduction
This manual provides information for the
installation and operation of Laars Volume Water
Figure 1 – Heater Configuration - Model VW.
Outdoor Indoor
Heaters. It is strongly recommended that all
application and installation procedures be reviewed
completely before proceeding with the installation.
Consult the factory, or local factory representative,
with any problems or questions regarding this
equipment. Experience has shown that most operating
problems are caused by improper installation.
Model VW heaters are available from the factory
in two configurations: An indoor version and an
outdoor version. In addition, the heaters are field
convertible. See Section 6 of this manual.
Some accessory items are shipped in separate
packages. Verify receipt of all packages listed on the
packing slip. Inspect everything for damage
immediately upon delivery, and advise the carrier of
any shortages or damage. Any such claims should be
filed with the carrier. The carrier, not the shipper, is
responsible for shortages and damage to the shipment
whether visible or concealed.
1.2 Flow Requirements
All low volume hot water heaters must have
continuous flow through the heat exchanger when
firing for proper operation. The system pump must be
capable of developing sufficient pressure to overcome
the resistance of the heater plus the entire circulating
system at the designed flow rate.