Mighty Therm Hydronic Boiler
Page 3
SECTION 1.
General Information
1A. Introduction
This manual provides information for the
installation and operation of Laars hydronic boilers. 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 not system design.
Some accessory items are shipped in separate
packages. Verify receipt of all items 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.
IMPORTANT WARNING:
The model HH and PH hydronic boilers must be
installed in accordance with the procedures outlined
in this manual. The warranty does not apply to boilers
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, National Electrical Code ANSI/NFPA
70 and/ or in Canada CAN 1 -13149 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 boilers No. CSD-1, and in Canada CGA 3.3. Any
modification to the boiler, its gas controls, gas
orifices, wiring or draft diverter may void the Laars
warranty. If field conditions require such
modifications, consult factory.
1B. Boiler Identification
Consult rating plate on the boiler. The following
example simplifies the boiler identification.
1
2
3
4
5
6
PH
1670
I
N
09
L
(1) Basic boiler model (see descriptions below).
(2) Input rate X 1000 BTU/hr.
(3) Indoor (1) or Outdoor (E) installation.
(4) Gas type: Natural (N) or Propane (P).
(5) Ignition system: I.I.D. (09) or continuous pilot
(16). Special option: I.I.D. (04) 115 volts.
(6) Firing modes:
On/Off (C)
2-stage (K)
4-stage (L)
Mechanical Modulation (H)
Motorized Modulation (F)
Motorized On/Off (R)
Motorized 2-stage (T).
Model HH
hydronic heating boilers. There must
be a field installed pump to circulate water.
Model PH
hydronic heating boilers are basically
the same as the HH models except that the PH boilers
come with integrally mount pumps. Pumps are sized
for pressure drop through the heat exchanger and short
runs of pipe for primary-secondary systems.
Laars hydronic boilers are available in two
configurations: an indoor version and an outdoor
version. Both are available from the factory (see
Figure 1).
1C. Flow Requirements
All low volume hydronic boilers must have
continuous flow through the heat exchanger for proper
operation. The system pump must be capable of
developing sufficient pressure to overcome the
Figure 1. Boiler Configuration.
