Weil-McLain GV90+ User manual

Weil-McLain
500 Blaine Street
Michigan City, IN 46360-2388
http://www.weil-mclain.com
C-2101 (0411)
Page 1 of 3
I. General Requirements
A. Furnish and install ________ (qty) packaged, sealed combustion, power-vented, high
efficiency gas-fired boiler(s) with cast-iron sectional primary heat exchanger(s) and stainless
steel secondary heat exchanger(s).
B. Install packaged boiler unit(s) according to manufacturer’s installation instructions. All work to
be done in a neat and workmanlike manner.
C. Weil-McLain ________ (qty) GV90+________ (size), packaged boiler(s) capable of burning
(natural) (propane) gas.
D. Boiler(s) shall have I=B=R Hydronics Institute gross output at 100% fire rate _________ MBH
per boiler.
E. Boiler(s) shall be 91% minimum DOE efficient as required by National Energy Conservation
Act or ASHRAE 90.1.
F. Boiler(s) shall be manufactured to conform to Section IV of the ASME Boiler and Pressure
Vessel Code.
1. Individual sections (and section assembly) to be hydrostatically pressure tested at
factory in accordance with ASME requirements.
2. Maximum allowable working pressure 50 PSIG water cast as part of section with
ASME symbol.
G. Regulatory Requirements
1. Boiler(s) and controls to complywith applicable regulations.
2. Boiler(s) shall meet U.S. Environmental Protection Agency and Department of Energy
guidelines for “Energy Star” energy efficiency.
II. Product
A. Acceptable boiler manufacturer(s) include(s):
1. Weil-McLain only, as specified in Part I, Paragraph C.
GV90+ Boiler
Suggested Specifications

Weil-McLain
500 Blaine Street
Michigan City, IN 46360-2388
http://www.weil-mclain.com
C-2101 (0411)
Page 2 of 3
2. Other manufacturer or other Weil-McLain boiler(s) must comply with specifying
engineer’s requirements, including:
a) Full intent of these specifications, and
b) Provide complete submittal including literature, manuals, and wiring
diagrams, fuel piping diagrams, and list of similar installations. The alternate
must be of similar size and footprint, piping configuration, clearance
requirements and heating surface.
c) Submittal presented to engineer at least seven working days before bid
opening for approval. Substitutions are not permitted after contract is
awarded.
B. Boiler Construction
1. Cast Iron Boiler Sections
a) Assembled with tie rods and sealed with high temperature silicone sealant to
assure a permanent gas-tight seal.
b) Sealed water-tight by elastomer sealing rings, not cast-iron nipples. Each
port opening is machined to accept sealing ring between sections in order to
assure uniform compression of the sealing rings and to protect the sealing
rings from contaminants.
c) Sections shall have wide waterways to reduce heat concentration and
tendency for liming.
2. Secondary Heat Exchanger
a) Secondary heat exchanger(s) will be of the counter flow shell and tube type
employing dimpled tubes and baffles and constructed using welded stainless
steel for added efficiency.
3. Boiler(s)
a) The combustion chamber will be sealed and located at the top of the section
which will be of counter flow design, to assure that sediment and any lime
that might form will fall to the bottom, away from the crown sheet area.
b) The burner shall be premix combustion type, a single burner with tight,
efficient flame, located in a totally sealed combustion chamber.
c) Electronic control module must be of integrated solid state technology
utilizing LED’s for sequence of operation and service diagnostics.

Weil-McLain
500 Blaine Street
Michigan City, IN 46360-2388
http://www.weil-mclain.com
C-2101 (0411)
Page 3 of 3
d) Boiler(s) shall be supplied with a gas valve designed with negative pressure
regulation (fan suction “pulls” gas through valve rather than gas pressure
“pushing” gas through valve). This enables the boiler to operate in a safe
condition at a derated output, even if the inlet gas pressure should drop to
as low as 2 inches W.C. The inlet (natural) (propane) gas pressure to the
boiler gas valve should be a minimum of 4” W.C. and a maximum of 13”
W.C. If inlet gas pressure exceeds 13” W.C., a 100% lock-up type gas
pressure regulator of adequate size must be installed in gas supply piping
and adjusted to prevent pressure in excess of 13” W.C.
C. Venting and Combustion Air
1. Boiler(s) must be capable of using outside air piped directly to boiler (direct vent), or
inside boiler room air for combustion (direct exhaust).
2. The boiler(s) shall be vented and/or exhausted using 3-inch PVC, CPVC, ABS, or
AL29-4Cstainless according to manufacturer’s required schedules and grades.
3. When using outside air piped directly to boiler for combustion, inlet and termination
of these pipes must be connected either through the roof or the sidewall using
termination kit supplied by the manufacturer.
4. All venting and exhausting should follow manufacturer’s recommendations and
instructions for safety and performance.
D. Boiler Trim
1. All electrical components to be of high quality and third (3rd) party recognized.
2. Water boiler(s) controls furnished:
a) High limit temperature control (220 degrees F maximum allowable boiler
water temperature).
b) Combination pressure-temperature gauge. Gauge dial clearly marked and
easy to read.
c) ASME certified pressure relief valve, set to relieve at 30 PSIG. Optional
relief valve available up to and including maximum allowable working
pressure.
d) Section block temperature limit switch.
E. Boiler Manuals
1. The boiler(s) shall be provided with complete instruction manuals, including:
a) Boiler Installation Manual
b) User’s Manual