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D. High Altitude Installations
NOTICE: If the heating value of the gas has been reduced,
these rules do not apply. Check with your local gas utility
or authorities having jurisdiction.
When installing above 2000 feet elevation:
• In the USA: Reduce input rate 4% for each 1000 feet
above 2000 feet.
• In CANADA: Input ratings are certified without a reduction
of input rate for elevations up to 4500 feet (1370 m)
above sea level. Please consult provincial and/or
local authorities having jurisdiction for installations at
elevations above 4500 feet (1370 m)
Check with your local gas utility to determine proper
orifice size.
E. Air Shutter Setting
Air shutter settings should be adjusted by a qualified ser-
vice technician at the time of installation. The air shutter
is set at the factory for minimum vertical vent run. Adjust-
ing air shutter may be desired for longer vent runs. See
Figure 7.5.
NOTICE: If sooting occurs, provide more air by opening
the air shutter.
Figure 7.5 Air Shutter
Air Shutter Settings
COSMO-I30-IFT
COSMO-I35-IFT
Heat & Glo • COSMO-I30-IFT, COSMO-I35-IFT Installation Manual • 2535-980 Rev. V • 10/23
NG
Propane
1/2 in.
Full Open
3/8 in.
Full Open
F. Service / Replace Appliance Gas Valve
• See Figure 7.6.
• Remove appliance front, glass, logs, base pan assem-
bly, burner assembly and valve plate assembly. See
Figure 7.6.
• Service/Replace gas valve.
• Reinstall valve plate assembly, burner assembly, base
pan assembly, logs and appliance glass and front.
SERVICE / REPLACE
APPLIANCE GAS VALVE
Figure 7.6 Gas Valve Detail
33
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