1083294-UIM-C-0615
Johnson Controls Unitary Products
33
Specially Engineered Installations
The above requirements shall be permitted to be waived where special
engineering, approved by the authority having jurisdiction, provides an
adequate supply of air for combustion and ventilation.
VENT BLOWER ROTATION
For ease of venting, the vent blower may be rotated 90° in either direc-
tion. For upflow installations the vent may exit through the top or either
side of the cabinet. For downflow installations, the vent blower must be
rotated so that the vent exits through either side of the cabinet. See Fig-
ures 26-29 for illustrations of different inducer rotation positions.
SECTION VIII: START-UP AND
ADJUSTMENTS
The initial start-up of the furnace requires the following additional
procedures:
When the gas supply is initially connected to the furnace, the gas piping
may be full of air. In order to purge this air, it is recommended that the
ground union be loosened until the odor of gas is detected. When gas is
detected, immediately retighten the union and check for leaks. Allow
five minutes for any gas to dissipate before continuing with the start-up
procedure. Be sure proper ventilation is available to dilute and carry
away any vented gas.
GAS PIPING LEAK CHECK
It is recommended that when the gas supply is first connected to the
furnace, the ground union be loosened until the odor of gas is detected.
When gas is detected, immediately tighten the union and check for gas
leaks. Allow five minutes for any gas to dissipate before continuing with
the startup procedure. Be sure that proper ventilation is available to
dilute and carry away any vented gas.
With furnace in operation, check all of the pipe joints, gas valve connec-
tions and manual valve connections for leakage using an approved gas
detector, a non-corrosive leak detection fluid or other leak detection
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 defi-
ciencies, 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 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 CO
2
and CO levels of each appliance. Use a draft gauge to check for a downdraft or inad-
equate 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:
A 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 appro-
priate tables in Appendix G of the above codes or for this appliance.
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FIGURE 41:
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.
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IMPORTANT
All electrical connections made in the field and in the factory should
be checked for proper tightness.
WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could result in serious
injury, death or property damage.
Never test for gas leaks with an open flame. Use a commercially
available soap solution made specifically for the detection of leaks to
check all connections. A fire or explosion may result causing property
damage, personal injury or loss of life.
IMPORTANT
Burner ignition may not be satisfactory on first startup due to residual
air in the gas line or until gas manifold pressure is adjusted. The igni-
tion control will make three attempts to light before locking out.
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