7
240012994 Rev. B [08/31/2020]
Information and specications outlined in this manual in eect at the
time of printing of this manual. Manufacturer reserves the right to
discontinue, change specications or system design at any time without
notice and without incurring any obligation, whatsoever.
2 - INTRODUCTION
2.5 Designated Use
• GCWB9-150 and GCWB95W-205 provide both central
heating and domestic hot water.
• Indoor installation.
• Closet or alcove installation. Direct Vent Boiler does not
require air vents when installed in closet or room.
• Direct vent boiler, requires fresh air intake piped from
outdoors.
• For use with natural gas or liqueed 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 system pressure,
or drop below minimum system pressure 7.25 psig (.50
bar)
• Exceed 176°F (80°C) system design temperature.
2.7 Operational Features
• GCWB95W-150 Modulates input to provide CH
Turndown 5.7:1, DHW Turndown 7:1
• GCWB95W-205 Modulates input to provide CH
Turndown 5.5:1, DHW turndown 7:1
• Maximum output available for domestic hot water:
GCWB95W-150 - 136,000 btu/h (40 kW), capable
of providing 3.5 (U.S.) gpm (13.2 liters/min) with a
temperature rise of 70°F/39°C.
GCWB95W-205 - 180,000 btu/h (53 kW), capable
of providing 5.0 (U.S.) gpm (18.9 liters/min) with
temperature rise of 70°F/39°C.
• Integral Low Water Pressure Cuto.
• Optional Outdoor Temperature Reset.
• Heat exchanger over heat protection.
• Boiler operating at maximum operating temperature,
providing heat, pressure gauge should not indicate
more than 26.11 psi / 1.80 bar. If reading exceeds this
gure larger expansion tank is required.
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.
CANADA
• Natural Gas and Propane Installation Code, CAN/CSA
B149.1.
• Canadian Electrical Code, Part I, Safety Standard for
Electrical Installations, CSA C22.1
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 cuto 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 tter.
2.4 Manufacturer recommends use of Carbon
Monoxide monitor may be requirement of local
jurisdiction.
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