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Avoid bringing combustion air to the heater from an attic space. There is no guarantee that adequate combustion air will be supplied. If the heater is installed less than 2 ft. from the ceiling, a flexible transition section (e.g., flexible aluminum duct) must be provided to allow for expansion/contraction of straight tube heaters (LTS series). In colder climates, where necessary, insulate the outside combustion air duct. Avoid locating the outside combustion air duct directly above the control box. Provide a capped cleanout T as necessary. In high humidity applications, the control box should be sealed with silicone sealer. In multiple heater applications, the combustion air intake may be ducted individually or common ducted in the same configuration as shown for venting in Section 23. For combustion air intake duct sizing, please refer to the Vent Sizing Table and use the diameter indicated, based on the number of heaters per duct. 26) LIGHTING AND SHUTDOWN INSTRUCTIONS 1) Turn on the gas supply. 2) Set the thermostat to call for heat. 3) Ignition should occur after the 30-second air purge. 4) If ignition fails, the unit will spark for approximately 21 seconds and go into safety lockout. Turn the thermostat (power) off for 60 seconds to take the system out of lockout. 5) If the heater does not light, shut off gas completely for 5 minutes before attempting to relight. 27) IGNITION SYSTEM CHECKS_ > STEP 1: CHECK IGNITION CABLE. a) Make sure that the ignition cable does not touch any metal surface. b) Make sure that connections to the stud terminal and the igniter/sensor are clean and tight. c) Make sure that the ignition cable provides good electrical continuity. > STEP 2: CHECK IGNITION SYSTEM GROUNDING. (Nuisance shutdowns are often caused by a poor or erratic ground.) A common ground is required for the module, igniter, flame sensor and main burner. a) Check for good metal-to-metal contact between the igniter bracket and the main burner. b) Check the ground lead from the GND (BURNER) terminal on the module to the igniter bracket. Make sure connections are clean and tight. If the wire is damaged or deteriorated, replace it. c) Replace igniter/sensor with factory replacement part if insulator is cracked. Form #43155010 -16- Fet>04 6) ACAUTION: The heater must be grounded. Poor grounding will give nuisance lockouts, particularly during momentary power interruptions. 7) To shut down the heater, turn off the gas and the electrical supply. NOTE: The Lighting and Shutdown Instructions are also shown on the permanent nameplate attached to the heater control box. VERTICAL THROUGH THE ROOF 6” Starting Collar* (Field Supplied) Vent Cap (Leslie Versa Cap Type B) 6” diameter* Single-Wall Pipe 50 ft. long (maximum) (HORIZONTAL THROUGH SIDEWALL 1/4” per ft. slope downwards towards vent terminât Perforated Cover (Remove; * 4” for LTS40-75 > STEP 3: CHECK SPARK IGNITION CIRCUIT. AWARNING: THE IGNITION CIRCUIT GENERATES A 20,00...

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