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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 20,000 VOLT OPEN CIRCUIT AND ELECTRICAL SHOCK CAN RESULT. a) Check ignition cable. b) Check external fuse on the module. c) Verify power (24V) at module input terminals and output terminal to gas valve. d) Replace spark module if fuse and power are OK. > STEP 4: CHECK FLAME SENSOR CIRCUIT. a) Turn off heater at thermostat. b) Connect a meter (dc microammeter scale) in series with the ground lead as shown in the diagram. Use a Honeywell W136 Test Meter or equivalent. Connect the meter as follows: • D...

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