White Rodgers 50T35-743 Installation Instructions Manual

Also see for 50T35-743: Installation instructions Installation instructions

Contents

3WARNINGCAUTIONFIRE HAZARD• Do not exceed the specified voltage.• Protect the control from direct contact with water(dripping, spraying, rain, etc.).• Label all wires before disconnection when servic-ing controls. Wiring errors can cause improperand dangerous operation.• Route and secure wiring away from flame.Do not short out terminals on gas valve or pri-mary control. Short or incorrect wiring may dam-age the thermostat.MOUNTING AND WIRINGAll wiring should be installed according to local and na-tional electrical codes and ordinances.The control must be secured to an area that will experi-ence a minimum of vibration and remain below the maxi-mum ambient temperature rating of 175°F. The control isapproved for minimum ambient temperatures of -40°F.Any orientation is acceptable.Refer to the wiring diagram and wiring table whenconnecting the 50T35 control to other components ofthe system.UL approved, 105°C rated 18 gauge, stranded, 2 / 64 ”thick insulation wire is recommended for all low voltagesafety circuit connections.UL approved 105°C rated 16 gauge min., stranded, 4 /64 ”thick insulation wire is recommended for all line voltageconnections.Follow the appliance manufacturer’s recommended in-stallation or service instructions.SHOCK HAZARD• Disconnect electric power before servicing .• Ensure proper earth grounding of appliance.• Ensure proper connection of line neutral and linehot wires.EXPLOSION HAZARD• Shut off main gas to appliance until installation iscomplete.INSTALLATIONRemove both access panels.For GMP & GMPV series units, cut the white jumper wirebetween pins 4 & 7 of the 9 pin connector.For GMPN & GMN series units, DO NOT cut the whitejumper wire.Remove the edgecard connector and other wires from theexisting module. Discard the thermostat wires re-moved from the board (R, W & G).Remove the existing HSI module. Care should be exer-cised to avoid damage to the nylon standoffs.Install the 50T35-743 module.Reconnect the edgecard connector making sure of goodcontact.Push the 9 pin connector into the HSI module. It can go inonly one way. DO NOT force.Reconnect the supplied thermostat wires.Remove the red wire from the 24 volt side of the secondaryside of the transformer and discard.Remove the blue ground wire from the transformer. DONOT discard.Remove the blue wire from the transformer and discard.Connect the red wire from the 9 pin connector to "24 volt"of the secondary side of the transformer.Connect the blue wire from the 9 pin connector to "Com-mon" terminal of the secondary side of the trans-former. This wire has a piggy back terminal.Connect the blue ground wire, which was previouslyremoved, also to the "Common" terminal of the trans-former.Replace the access panels.Restore gas and electrical power to the furnace.Verify the sequence of operation as noted in the furnacemanufacturers Installation & Operating Instructions.BlackWhite24 v. RedCom. BlueGND. BlueTRANSFORMER115v. SupplyThe 50T35 has only one serviceable part–an automotivetype fuse, which protects the low voltage transformer fromdamage if its output is short-circuited. If the fuse hasopened up, remove whatever caused the short circuit andreplace the fuse with the same type 3 Amp automotivefuse. If the control does not operate correctly after replac-ing the fuse, replace the entire 50T35 control. There areno other user serviceable parts.

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