7
Information and specifications outlined in this manual in effect at the
time of printing of this manual. Manufacturer reserves the right to
discontinue, change specifications or system design at any time without
notice and without incurring any obligation, whatsoever.
2 - INTRODUCTION
2.5 Designated Use
• GMCB150 and GMCB200 provide both central heating
and domestic hot water.
• GMHB125 and GMHB160 central heating only.
• Indoor installation.
• Closet or alcove installation. Direct Vent Boiler does not
require air vents when installed in closet or room.
• Direct vent boiler.
•
For use with natural gas or liquefied petroleum gases
(LP/propane).
2.6 The unit MUST NOT:
• Directly heat potable water. Indirect heating is
acceptable.
• Heat water with non-hydronic heating system chemicals
present (example, swimming pool water).
• Toxic chemicals, such as those used for boiler
treatment, shall not be introduced into potable water
used for space heating.
• Exceed 43 psig (2.96 bar) maximum allowable working
pressure, or drop below minimum system pressure 7.25
psig (.50 bar)
• Exceed 176°F (80°C) system design temperature.
• Shall not be installed on carpeting.
2.7 Operational Features
• Modulates to provide CH Turndown 5:1, DHW
Turndown 6:1.
• Maximum output available for domestic hot water:
GMCB125
- 133,000 btu/h (39 kW), capable of providing
3.4 (U.S.) gpm (13.2 liters/min) with a temperature rise
of 70°F/39°C.
GMCB200
- 176,000 btu/h (52 kW), capable of
providing 4.9 (U.S.) gpm (18.9 liters/min) with
temperature rise of 70°F/39°C.
•
Integral Low Water Pressure Cutoff.
• Outdoor Temperature Reset included.
• Heat exchanger over heat protection.
• Boiler operating at maximum operating temperature,
providing heat, pressure gauge should not indicate
more than 26.11 psig / 1.80 bar. If reading exceeds
this figure larger expansion tank is required.
•
Boiler requires field supplied and installed system
pump(s) and relay/zone control board.
2 - Introduction
2.1 Installation shall conform to requirements of
authority having jurisdiction or in absence of such
requirements:
UNITED STATES
• National Fuel Gas Code, ANSI Z223.1/NFPA 54
.
• National Electrical Code, NFPA 70.
2.2
Where required by authority having jurisdiction,
installation shall conform to Standard for Controls
and Safety Devices for Automatically Fired Boilers,
ANSI/ASME CSD-1.
Additional manual reset low water cutoff may be required.
2.3 Requirements for Commonwealth of
Massachusetts:
Boiler installation must conform to Commonwealth of
Massachusetts code 248 CMR which includes but is not limited
to:
Installation by licensed plumber or gas fitter.
2.4 Manufacturer recommends the use of a carbon
monoxide detector for all installations.
2.4.1 A carbon monoxide detector may be required
by local code, follow all local codes.
PN 240012363 REV. A [08/31/2018]
