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Table of contents for the manual
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Page 1
07/03 *2P0703* 504,650M *P504650M* G50UHi SERIES Litho U.S.A. 504,650M 07/03 E 2003 Lennox Industries Inc. Dallas, T exas, USA WHA T TO DO IF YOU SMELL GAS: Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other apĆ pliance. Installation and service must be performed by a qualified installer , s[...]
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Page 2
Page 2 G50UHi Parts Identification DURALOK TM HEA T EXCHANGER ASSEMBL Y UPPER ACCESS P ANEL BURNERS BLOWER MOTOR CABINET CONTROL BOX GAS V AL VE AND MANIFOLD COMBUSTION AIR INDUCER BLOWER ACCESS P ANEL FLUE TRANSITION TOP CAP SURELIGHT ® CONTROL BOARD FIGURE 1 BLOWER CONTROL MODULE W ARNING Product contains fiberglass wool. Disturbing the insulati[...]
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Page 3
Page 3 W ARNING Do no t use thi s fur nac e if any par t has be en und erĆ water . A flood-damaged furnace is extremely danĆ gerous. Attempts to use the furnace can result in fire or explosion. Immediately call a qualified serĆ vice t echnician to i nspect t he f urnace a nd to r eplace all g as c ontrols, c ontrol s ystem parts, and electrical [...]
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Page 4
Page 4 The g as valve on t he G50UHi will be e quipped with either a gas control knob or l ever . Use only your hand to turn the gas c ontrol k nob o r p ush the gas lever . Never u se tools. If the k nob or l ever will n ot move b y h and, do n ot t ry to r epair it . Cal l a qua li fie d ser vi ce te chn ic ian . Fo rce o r att em pte d repair ma[...]
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Page 5
Page 5 4 - White Rodgers 36E/36F Gas V alve - Switch gas valve lever to OFF . Honeywell VR8205 Gas V alve - Tu r n k n o b o n g a s valve clockwise t o OFF . Do not force. 5 - Replace the upper access panel. Filters All G50UHi filters a re installed external to the unit. F ilters should be inspected monthly . Clean or replace the filters when nece[...]
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Page 6
Page 6 Service Reminder Call your Lennox service technician if the unit w ill not operĆ ate. Before calling, always check the following to be sure service is required: 1 - Check that electrical disconnect switches are ON. 2 - Check room thermostat for proper setting. 3 - Replace any blown fuses or reset circuit breakers. 4 - Gas valve should be ON[...]
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Page 7
Page 7 Repair Parts List The following repair parts are available through Lennox dealers. When ordering parts, include the complete furnace model number listed on the CSA nameplate -- Example: G50UHi-36A-070-1. Cabinet Parts Upper access panel Blower access panel T op Cap Control Panel Parts T ransformer SureLight ® ignition board Door interlock s[...]