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IV. PRE-INSTALLATION PREPARATION.
THIS APPLIANCE MAY ONLY USE THE APPROVED VENTING SYSTEMS SHOWN IN THIS
INSTALLATION. IT MUST NOT BE CONNECTED TO A CHIMNEY FLUE SERVICING A SEPA-
A. GAS PRESSURE
For natural gas, the minimum inlet gas supply pres-
sure is 4.5 inches water column, and the maximum
inlet gas pressure is 7.0 inches water column, for the
purpose of input adjustment. Input rate is 30,000
Btu/hr. For propane gas, the inlet gas supply pres-
sure must be at least 11.0 inches water column and a
maximum 14.0 inches water column. Input rate is
30,000 Btu/hr.
Manifold pressure for this heater is 1.7 - 3.5 inches
water column for natural gas and 5.4 - 11.0 inches
water column for propane gas. This heater has a
variable adjust manifold.
A 1/8" NPT plugged tapping is provided on the gas
control valve, near the outlet to the main burner
immediately upstream of the gas supply connection to
the heater, accessible for a test gage connection.
Pressure taps are located on top of the valve for both
inlet and outlet pressure.
B. HIGH ALTITUDE INSTALLATION
For U.S. installation, units are tested and approved
for elevations from 0-2000 feet.
When installing this unit at an elevation above 2000
feet, it may be necessary to decrease the input rating
by changing the existing burner orifice to a smaller
size. Input should be reduced 4 percent for each
1000 feet above sea level. Check with the local gas
utility for proper orifice size identification. This unit is
shipped with a .106 in./2.67 mm. orifice size on natur-
al gas versions and a .063 in./1.60 mm. orifice size on
propane gas versions.
For Canadian installation, units are certified for eleva-
tions from 0-4500 feet. When installing this unit at an
elevation between 0-4500 feet in Canada, the input
rating does not need to be reduced.
When installing this unit at an elevation above 4500
feet in Canada, check with local authorities.
Consult your local gas company for assistance in
determining the proper orifice for your location or refer
to ANSI Z223.1-latest edition, Appendix F.
C. CLEARANCES
The following clearances to combustibles must be
maintained: Minimum clearances to the floor - 0", back
of unit to wall - 4", sides of unit to wall - 6", base of the
unit to ceiling - 72".
Floor Protection: See page 9, the section entitled
"Positioning the appliance."
12-99
WARNING!
RATE SOLID FUEL OR GAS FUEL BURNING APPLIANCE.
R-CAST SERIES WALL FURNACE
Minimum clearances to venting are as follows:
Horizontal runs require a 1
the top and a
1
⁄
" minimum air space on the sides and
2
bottom of the outer vent section. If an elbow is being
used in an enclosed wall, floor or ceiling, a top air
space clearance of 3" must be maintained. Vertical
rise sections require a 1" minimum air space complete-
ly around the vent section. These clearances must be
maintained at all times.
This appliance is certified for installation in a bed-
room or bed/sitting room in the U.S. and Canada.
Mobile Home Installations. Appliances installed in
mobile homes must be secured to the floor in a mini-
mum of two locations.
Minimum Clearances To Combustibles
Note: ALCOVE MINIMUM CEILING HEIGHT -
72 '' to combustible ceiling; 48'' to non-com-
bustible ceiling.
8
1
⁄
" minimum air space on
2
Figure 1
30750B
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