CAUTION: UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit component damage.
DO NOT connect furnace control HUM terminal to HUM (humidifier) terminal on Thermidistat™, Zone Controller or similar device. See
Thermidistat™, Zone Controller, thermostat, or controller manufacturer’s instructions for proper connection.
2. Humidifier (HUM)
A quick-connect terminal (HUM) and screw terminal (C
OM
24v) are provided for 24-v humidifier connection. (See Fig. 35.) HUM terminal
is energized with 24v (0.5-amp maximum) when gas valve is energized.
NOTE:
A field-supplied, 115-v controlled relay connected to EAC terminals may be added if humidifier operation is desired during blower
operation.
PROCEDURE 6—REMOVAL OF EXISTING FURNACES FROM COMMON VENT SYSTEMS
When an existing Category I furnace is removed or replaced, the original venting system may no longer be sized to properly vent the remaining
attached appliances. An improperly sized Category I venting system could cause the formation of condensate in the furnace and vent, leakage of
condensate and combustion products, spillage of combustion products into the living space, etc.
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. Seal any unused openings in venting system.
2. Inspect the venting system for proper size and horizontal pitch, as required in the National Fuel Gas Code, ANSI Z223.1-2002/NFPA
54-2002 or the CSA B149.1, Natural Gas and Propane Installation Code and these instructions. Determine that there is no blockage
or restriction, leakage, corrosion and other deficiencies, which could cause an unsafe condition.
3. As far as practical, close all building doors and windows and all doors between the space in which the appliance(s) connected to
the venting system are located and other spaces of the building.
4. Close fireplace dampers.
5. Turn on clothes dryers and any appliance not connected to the venting system. Turn on any exhaust fans, such as range hoods and
bathroom exhausts, so they are operating at maximum speed. Do not operate a summer exhaust fan.
6. Follow the lighting instructions. Place the appliance being inspected into operation. Adjust the thermostat so appliance is operating
continuously.
7. Test for spillage from draft hood equipped appliances at the draft hood relief opening after 5 minutes of main burner operation. Use
the flame of a match or candle.
8. If improper venting is observed during any of the above tests, the venting system must be corrected in accordance with the National
Fuel Gas Code, ANSI Z223.1-2002/NFPA 54-2002 and/or CSA B149.1, Natural Gas and Propane Installation Code.
9. After it has been determined that each appliance connected to the venting system properly vents when tested as outlined above,
return doors, windows, exhaust fans, fireplace dampers and any other gas-fired appliance to their previous conditions of use.
Vent system or vent connectors may need to be resized. For any other appliances when resizing vent systems or vent connectors, system or
connector must be sized to approach minimum size as determined using appropriate table found in the NFGC or NSCNGPIC.
PROCEDURE 7—DIRECT VENTING (ALL SIZES)
A.
General
The PG9MAA can be vented as either a direct vent or as a non-direct vent (except for 140 size) application. A direct vent system shall be installed
in accordance with the instructions in this section only. For non-direct vent applications, refer to the Non-Direct Venting section.
Fig. 33—Relocating J-Box
A00212
FACTORY
INSTALLED
LOCATION
ALTERNATE
FIELD
LOCATION
—31—
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