Air For Combustion.16; Direct Outside Air For Combustion.16; Lighting And Shutdown Instructions.16; Ignition System Checks.16 - Space-Ray LTS Series Assembly, Installation And Operation Instructions

24) AIR FOR COMBUSTION_
If indoor combustion air is to be supplied for a tightly enclosed area, one square inch of free area opening shall be provided
below the heater for each 1,000 Btu/hr of heater input. Adequate clearances round the perforated fresh air plate must be
maintained at all times. In larger open areas of buildings, infiltration normally is adequate to provide air for combustion.
25) DIRECT OUTSIDE AIR FOR COMBUSTION_
Outside combustion air should be supplied directly to the heater when the building is subject to negative pressure,
contaminants or high humidity are present in the building air. These contaminants include paints, solvents, corrosive vapors
or any other foreign particles that may cause damage to the heater or result in poor combustion.
Outside combustion air can be brought directly to the heater by a 6"diameter* duct less than 50 ft. long or equivalent. This is
attached to a 6" diameter* starting collar. The starting collar is fitted to the top of the control cabinet after first removing and
discarding the perforated cover. An approved vent cap must be placed directly on the end of the outside combustion air inlet
pipe. The combustion air inlet should be a minimum of 3 ft. (0.9m), either vertically or horizontally, from the flue vent
termination. The air intake terminal must be located not less than 1 ft. (30cm) above grade, it is good installation practice to
supply combustion air from the same pressure zone as the vent outlet. 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.
VERTICAL
THROUGH THE ROOF
6" Starting Collar*
(Field Supplied)
Vent Cap
(Leslie VersaCap Type B}
6" diameter^ Single-Wall Pipe
50 ft. long (maximum)
I
HORIZONTAL
THROUGH SIDEWALL
1/A" per ft. slope downwards
towards vent terminal
Perforated Cover
fRemove)
*4''forLTS40-75
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.
6) ACAIITION: 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.
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
F«b-04