5894307-UIM-B-0920
Johnson Controls Ducted Systems
23
Specially Engineered Installations
The above requirements are permitted to be waived where special engi-
neering, approved by the authority having jurisdiction, provides an ade-
quate supply of air for combustion and ventilation.
SECTION VIII: START-UP AND
ADJUSTMENTS
The following start-up checks
MUST
be performed by the furnace
installer on every new furnace installation:
1. Gas piping leak check
2. Ignition check
3. Furnace input rate check
4. Air temperature rise check
Instructions on how to perform each of these required installation
checks are listed in the sections below.
When the gas supply is initially connected to the furnace, the gas piping
may be full of air. To purge this air, loosen the ground union until the
odor of gas is detected. When gas is detected, immediately retighten
the union and check for leaks. Allow 5 min for any gas to dissipate
before continuing with the start-up procedure. Make sure that proper
ventilation is available to dilute and carry away any vented gas.
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-
monxide 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 and all doors.
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 continu-
ously.
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 min 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 CO
2
and CO levels of each appliance. Use a draft gauge to check for a downdraft or inade-
quate 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.
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.
!
Figure 29:
Attic and Crawl Space Combustion Air Termination
WARNING
Be sure to instruct the owner not to block this intake pipe.
12” Min.
12” minimum
between bottom
of air intake and
any material below.
!
IMPORTANT:
All electrical connections made in the field and in the
factory must be checked for proper tightness.
