1083163-UIM-I-0618
Johnson Controls Unitary Products
27
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 21-24 for illustrations of different inducer rotation positions.
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.
Furnace input rate check.
3.
Air temperature rise check.
Instructions on how to perform each of these required installation
checks are listed in the section “NOx SCREEN REMOVAL (Lo-NOx
Models Only)”.
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.
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 contin-
uously.
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 open-
ing 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 inadequate draft condition.
6. After it has been determined that each appliance properly vents when tested as outlined above, return doors, windows, exhaust fans, fire-
place 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 31:
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 should
be checked for proper tightness.
