Hearthstone Quality Home Heating Products, Inc.
Tucson DX/ST Model 8702
28
Gas Connections
The gas supply connection is made to the Tucson’s
gas control valve under the bottom left center of the
unit using a 3/8” male NPT fitting. The supply line
should be ½” diameter, or appropriately sized to
provide a sufficient gas supply to meet the maximum
demand of the unit without undue loss of pressure.
We recommend a flexible line to avoid undue
mechanical load on the valve and to ease thread
alignment, but refer to local codes.
CAUTION: CHECK FUEL GAS TYPE!
The Tucson is factory equipped to use natural gas
(NG) and requires conversion for use with propane
(LP). You must purchase and install a propane (LP)
fuel conversion kit if required for your installation.
Use kit 97-56100 (ST) or 97-56104 (DX). Contact
your Hearthstone dealer.
Gas Supply
This appliance and its individual shutoff valve must
be disconnected from the gas supply piping system
during any pressure testing of that system at test
pressures in excess of ½ psig. The Tucson must be
isolated from the gas supply piping system by
closing its individual manual shutoff valve during any
pressure testing of the gas supply piping system at
test pressures equal to or greater than ½ psig.
Gas Pressure Adjustment
NOTE: A QUALIFIED TECHNICIAN MUST
PERFORM THIS PROCEDURE!
Once connected to the gas supply, the supply line
and manifold gas pressures must be tested. The
supply line pressure is tested to ensure it meets the
minimum gas supply pressure as listed in the
specifications for the type of fuel in use (NG or LP).
Test by connecting a manometer to the supply line
and adjusting the incoming pressure if necessary to
meet the required supply line pressure as listed in
specifications. The manifold pressure tap on the gas
control valve, refer to
Figure 14
for location.
High Altitude Installations
For high altitude installations consult the local gas
distributer or the authority having jurisdiction for
proper rating methods.
The decreased atmospheric pressure at higher
altitudes affects the heat value of fuel gases. Gas
suppliers typically derate the gas intended for use at
elevations above 2000 feet (610 meters). Check with
your gas supplier before derating this appliance.
If the installer must convert the unit to adjust for
varying altitudes, the information sticker (
similar to
the one shown in Figure 16
) must be filled out by
the installer and adhered to the appliance at the time
of conversion.
For installations from 2000 – 4500
feet (610-1370 meters) use the orifice sizes
(DMS) 42 for NG and 54 for LP. See the rating
label for more information.
This appliance is factory equipped for use at 0-2000
feet (0-610 meters) altitude. (
Cet appareil est
equipe pour des altitudes compries entre 0 et
2000pieds (0-610m) seulment).
This app lianc e is fac tory set fo r use b etween 0-200 0 ft.
A conve rsion kit for the Tuc so n (8702 ) is availab le
through HearthStone and sha ll be used to c onvert this
a pplianc e to th e app ropriate altitud e. Instruc tions a re
inc luded with the kit. Ask for Kit # 97-56106 for altitude
2000-4500 ft. The c onversion should b e c arried o ut in
a c cord a nce with the requirem ents o f the Authority
Ha ving Jurisdic tion.
The norm al inpu t rating
NG
LP
This app lianc e has b een c onverted fo r use at an
a ltitude of _______ Orific e _______
Manifo ld pressure ______________
Inp ut (b tu/hr) __________________Fuel Type ________
Da y_______ Mo nth ____________ Yea r______________
With kit numb er _________________________________
Conversion p erform ed by:
Na me: ______________________________________
Compa ny:___________________________________
Ad dress: _____________________________________
Inp ut ra ting (0-2000 ft)
25,000
25,000
Inp ut ra ting (2000-4500 ft)
24,200
24,800
Figure 16: Sample Information Sticker
Summary of Contents for Tucson 8702 DX
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