Part number 550-142-903/1016
6
&IGURE Estimated GV90+ input at altitude
Altitude
(feet)
% Sea level input
1,000 97
2,000 93
3,000 90
4,000 87
5,000 83
5,500 82
6,000 80
7,000 77
8,000 74
9,000 72
10,000 69
&IGURE Service clearances (recommended)
Prepare boiler location
Installations must follow these codes:
s ,Ocal, state, provincial, national codes, laws, regulations and ordinances.
s .ATIONAL&UEL'AS#ODE!.3):.&0!LATESTEDITION
s 3TANDARDFOR#ONTROLSAND 3AFETY $EVICESFOR!UTOMATICALLY&IRED
Boilers, ANSI/ASME CSD-1, when required.
s .ATIONAL%LECTRICAL#ODE
s &OR#ANADAONLYNatural Gas and Propane Installation Code, B149.1
or B149.2 Installation Code and CSA C22.1 Canadian Electrical Code
Part 1 and any local codes.
The GV90+ boiler gas manifold and controls met safe lighting and other
PERFORMANCECRITERIAWHENBOILERUNDERWENTTESTSSPECIlEDIN!.3):
— latest edition.
For the Commonwealth of Massachusetts, read and follow
the special instructions located on page 34 of this manual.
Install the boiler so control system and gas ignition system
components are
PROTECTEDFROMDRIPPING OR SPRAYING
WATERORRAIN
during operation. Allowing these components
to become wet could cause a boiler failure, resulting in severe
personal injury, death or substantial property damage.
High altitude installations
GV90+ boiler controls automatically reduce input with increasing altitude.
See Figure 1 for estimated input at altitude as a percentage of sea level
input. Multiply the boiler sea level input by this percentage to obtain the
estimated high altitude input. Note that the length of the venting system
will also have a minor impact on input. Refer to the vent supplement for
further information.
No modifications to the boiler should be necessary for installations up to
5,500 feet above sea level. For higher elevations, the air pressure switch
must be changed to a special high altitude switch. Refer to the high altitude
kit instructions, page 10. Note that the gas valve outlet pressure must be
checked (and adjusted if necessary) following instructions on page 63.
$/./4SIDEWALLVENT$)2%#4%8(!534!00,)#!4)/.3
at altitudes above 5,500 feet. Sidewall venting is only allowed
for $)2%#46%.4 applications (ducted combustion air) at
altitudes above 5,500 feet.
Vent length also affects boiler input — the boiler automati-
cally derates to compensate for pressure loss through the vent.
See the derate values given in Figure 109, page 103. For high
altitude installations, multiply the % in Figure 1 times the
value shown in Figure 109 to determine input vs sea level.
Service clearances
When possible, install GV90+ boilers with clearances at least as large as
shown in Figure 2 for best service access.
Flooring
The GV90+ boiler is approved for installation on combustible flooring,
but must never be installed on carpeting.
Do not install boiler on carpeting even if foundation is
used. Fire can result, causing severe personal injury, death
or substantial property damage.
GV90+ Series 2 GAS-FIRED WATER BOILER — Boiler Manual
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