Mighty Therm Volume Water Heater
Page 3
SECTION 1.
General Information
1A. Introduction
This manual provides information for the
installation and operation of Laars volume water
heaters. It is strongly recommended that all application
and installation procedures be reviewed completely
before proceeding with the installation. Consult the
Laars factory, or local factory representative, with any
problems or questions regarding this equipment.
Experience has shown that most problems are caused
by improper installation.
Some accessory items are shipped in separate
packages. Verify receipt of all packages listed on the
package slip. Inspect everything for possible damage
upon delivery, and inform the carrier of any shortages
or impairments. 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.
WARNING
All volume water heaters must be installed in
accordance with the procedures outlined in this
manual. The 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;
ANS1 Z223.1, National Electrical Code ANSI/
NFPA 70 and/or in Canada CAN1-B149
requirement.
When required by the authority having
jurisdiction, the installation must conform to
American Society of Mechanical Engineers
safety codes 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.
1B. Heater Identification
Consult rating plate on the heater. The following
example simplifies the heater identification.
1
2
3
4
5
6
PW
1670
I
N
09
C
1.
Basic heater model.*
2.
Input rate X 1000 BTU/hr.
3.
Indoor (I) or Outdoor (E) installation.
4.
Gas type: Natural (N) or Propane (P).
5.
Ignition system: I.I.D. (09) or continuous pilot
(16).**
6.
Firing rate: On/Off (C), 2-stage (K), 4-stage (L).
*Model VW water heaters for use with separate
storage tank. There must be a field installed pump to
circulate water between the heater and the storage
tank.
*Model PW water heaters are basically the same
as the VW series except that the PW heaters come
with integrally mount pumps.
*Model IW water heaters are tankless
instantaneous heaters, complete with mount pump for
use in applications having a suitable diversity in heater
load.
**Special Options: I.I.D. (04) 115 volts.
Laars commercial water heaters are available in
two models: an indoor version and an outdoor version.
Both are available from the factory (see Figure 1).
Figure 1. Boiler Configuration.
Pump
12¼
(311)
Gas
Conn.
A
Front
Top
V
10¼
(260)
29
5
/
8
(752)
58
(1473)
C
17
(432)
28¼
(718)
Side
17¾
(197)
Rear
Out
In
29
(737)
B
Pump
(PH Models)
19
(483)
Gas
Inlet
12
(305)
A
Front
30¾
(781)
61
(1549)
Out
In
14
(356)
7¾
(197)
41¾
(1060)
Side
4
(102)
