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WARNING
CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for each
appliance connected to the venting system being
placed into operation could result in carbon monoxide
poisoning or death.
The following steps shall be followed for each
appliance connected to the venting system being
placed into operation, while all other appliances
connected to the venting system are not in operation:
1. Inspect the venting system for proper size and
horizontal pitch. Determine that there is no blockage,
restriction, leakage, corrosion or other deficiencies,
which could cause an unsafe condition
2. Close all building doors and windows.
3. Turn on clothes dryers and TURN ON any exhaust
fans, such as range hoods and bathroom exhausts,
so they shall operate at maximum speed. Open the
fireplace dampers. Do not operate a summer exhaust
fan.
4. Follow the lighting instructions. Place the appliance
being inspected in operation. Adjust thermostat so the
appliance shall operate continuously.
5. Test each appliance (such as a water heater)
equipped with a draft hood for spillage (down-draft
or no draft) at the draft hood relief opening after 5
minutes of main burner operation. Appliances that
do not have draft hoods need to be checked at the
vent pipe as close to the appliance as possible. Use a
combustion analyzer to check the CO2 and CO levels
of each appliance. Use a draft gauge to check for a
downdraft or inadequate draft condition.
6. After it has been determined that each appliance
properly vents when tested as outlined above, return
doors, windows, exhaust fans, fireplace dampers
and any other gas burning appliance to their normal
condition.
7. If improper venting is observed during any of the
above tests, a problem exists with either the venting
system or the appliance does not have enough
combustion air (Supply Air from outside) to complete
combustion. This condition must be corrected before
the appliance can function safely.
Note: An unsafe condition exists when the CO reading
exceeds 40 ppm and the draft reading is not in excess
of -0.1 in. W.C. (-25 kPa) with all of the appliance(s)
operating at the same time.
8. Any corrections to the venting system and/or to the
supply (outside) air system must be in accordance
with the National Fuel Gas Code Z223.1 or CAN/CGA
B149.1 Natural Gas and Propane Installation Code
(latest editions). If the vent system must be resized,
follow the appropriate tables in Appendix G of the
above codes or for this appliance.
Installation Manual: RL18 Single-Stage Standard ECM Residential Gas Furnaces (Non-condensing Multi-position Standard
Start-up and adjustments
The furnace installer must perform the following start-up
checks on every new furnace installation:
•
Gas piping leak check
•
Furnace input rate check
•
Air temperature rise check
See the instructions on how to perform each of these
required installation checks in the sections that follow.
Important: You must check all electrical connections
made in the field and in the factory for adequate
tightness.
When the gas supply is initially connected to the furnace,
the gas piping may be full of air. In order to purge this air,
loosen the ground union until you detect the odor of gas.
When gas is detected, immediately retighten the ground
union and check for leaks. Allow 5 min for any gas to
dissipate before continuing with the start-up procedure.
Ensure adequate ventilation is available to dilute and
carry away any vented gas.
Removing NOx screens (Lo-NOx models
only)
When using the furnace with LP(propane) gas and it
is equipped with NOx screens, you must remove the
screens before start-up.
1.
Make sure that the electrical power to the unit is
turned off and that the gas supply is turned off at
the shut-off valve.
2.
Remove the burner compartment access door.
3.
Disconnect the gas supply piping at the union
to permit removal of the entire burner and gas
control assembly from the vestibule panel. Use the
wrench boss on the gas valve when removing or
installing the piping.
4.
Unplug the igniter from the wire harness.
Disconnect the flame sensor wires located on top
of the air shield. Unplug the gas valve from the
wiring harness.
5.
Remove the screws holding the burner assembly to
the vestibule panel.
6.
Remove the burner assembly. It should be possible
to swing the burner assembly out of the way
without disconnecting the remaining wires.
7.
With the burner assembly out of the way, slide the
NOx screens out of the heat exchanger tubes and
discard the screens.
8.
Replace all components in reverse order.
Reconnect all wiring.
Johnson Controls Ducted Systems
NOTICE
Low NOx)
27
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