Vent System; Combustion Air Inducer - York TM8V C Series Installation Manual

ACCESSORY CONNECTIONS
The furnace control will allow power-switching control of various acces-
sories.
ELECTRONIC AIR CLEANER CONNECTION
Two 1/4" (0.64 cm) spade terminals (EAC and NEUTRAL) for electronic
air cleaner connections are located on the control board. The terminals
provide 115 VAC (1.0 amp maximum) during circulating blower opera-
tion.
HUMIDIFIER CONNECTION
Two 1/4" (0.64 cm) spade terminals (HUM and NEUTRAL) for humidi-
fier connections are located on the control board. The terminals provide
115 VAC (1.0 amp maximum) during heating system operation.
A mounting hole is provided on the control panel next to the furnace
control board for mounting a humidifier transformer if required.
SINGLE STAGE THERMOSTAT
If a single stage thermostat is used, the high/low input staging will be
controlled by the furnace control board, using the staging jumper. If the
staging jumper is set to the 10, 15, or 20 position, the furnace will switch
from low fire to high fire after 10, 15, or 20 minutes and will stay in high
fire until the thermostat is satisfied. If the staging jumper is left in the
OFF position and a single stage thermostat is used, the furnace will
only operate at low fire.
TWINNING
These furnaces are not to be twinned. If more than one furnace is
needed in an application, each furnace must have its own complete
duct system and its own wall thermostat.
SECTION VI: VENT SYSTEM
VENT CONNECTIONS
All models are provided with a flue transition that is sized for 4" diame-
ter vent connections. If a larger size vent connector is required, that
connection must be installed external to the furnace. Figures 25 and 26
show the furnace as it is shipped from the factory. To convert to a hori-
zontal or downflow position, remove the four screws that secure the
inducer assembly and rotate 90° being careful not to damage the gas-
ket. Reinstall screws. Remove cap from appropriate vent outlet location
on the cabinet, cut insulation in cabinet to same size as the hole pro-
vided and reinstall cap in the hole in the top panel.

COMBUSTION AIR INDUCER

90°
Pressure Switch
Tube Routing
Pressure
Switch
FIGURE 25: Combustion Air Inducer
IMPORTANT
In downflow applications, do not block the combustion air inlet. The
furnace must be installed on a coil cabinet or subbase to allow com-
bustion air to enter the burner compartment.
Johnson Controls Unitary Products
90°
Mounting Screw
(Remove)
Flue Transition
(Do Not Remove)
Mounting Screw
(Remove)
CATEGORY 1 - 450 F. MAX. VENT TEMP.
The venting system must be installed in accordance with Section 5.3,
Air for Combustion and Ventilation, of the National Fuel Gas Code
Z223.1/NFPA 54 (latest edition), or Sections 7.2, 7.3 or 7.4 of CSA
B149.1, National Gas and Propane Codes (latest edition) or applicable
provisions of the local building code and these instructions.
The furnace shall be connected to any type of B, BW or L vent connec-
tor, and shall be connected to a factory-built or masonry chimney. The
furnace shall not be connected to a chimney flue serving a sepa-
rate appliance designed to burn solid fuel.
It is recommended that the appliance is installed in a location where the
space temperature is 32°F (0°C) or higher. If the appliance is installed in
a location where the ambient temperature is below 32°F (0°C), the com-
bustion byproducts could condense causing damage to the appliance
heat exchanger.
This appliance may be common vented with another gas appliance for
residential installations as allowed by the codes and standards listed in
these instructions.
Non-HUD approved Modular Homes must be vented with an approved
roof jack and may not be common vented with other appliances.
VENTING
Category I venting consists of vertically venting one or more appliances
in B-vent or masonry chimney (as allowed), using single wall metal pipe
or B-vent connectors. Type B-vent system extends in a general vertical
direction and does not contain offsets exceeding 45°. A vent system
having not more than one 60° offset is permitted.
VENTING INTO AN EXISTING CHIMNEY
For Category I installations, the furnace shall be connected to a factory
built chimney or vent complying with a recognized standard, or a
masonry or concrete chimney lined with a material acceptable to the
authority having jurisdiction. Venting into an unlined masonry chimney
or concrete chimney is prohibited.
Where use of an existing chimney is unavoidable, the following rules
must be followed:
1. The masonry chimney must be built and installed in accordance
with nationally recognized building codes or standards and must be
lined with approved fire clay tile flue liners or other approved liner
material that will resist corrosion, softening, or cracking from flue
gases. THIS FURNACE IS NOT TO BE VENTED INTO AN
UNLINED MASONRY CHIMNEY.
2. This furnace must be vented into a fire clay tile lined masonry chim-
ney only if a source of dilution air is provided, such as by common
venting with a draft hood equipped water heater. If no source of
dilution air is available, Type B vent must be used, or masonry
chimney vent kit 1CK0603 or 1CK0604 must be used. Refer to the
instructions with the kit to properly apply these masonry chimney
kits.
3. The chimney must extend at least 3 ft (0.91 m) above the highest
point where it passes through a roof of a building and at least two
feet higher than any portion of the building with a horizontal dis-
tance of ten feet.
4. The chimney must extend at least 5 ft (1.5 m) above the highest
equipment draft hood or flue collar.
5402847-UIM-A-0917
19