13
"Through the Base Pan Kit" Part Numbers
TTBCKHE02
TTBCKHE02FI (Factory Kit)
Low Voltage Control Wiring
1. A 24V thermostat must be installed for unit operation
unless the DDC controls option has been installed.
2. Locate thermostat or remote sensor in the conditioned
space where it will sense average temperature. Do
not locate the device where it may be directly exposed
to supply air, sunlight or other sources of heat. Follow
installation instructions packaged with the thermostat.
3. Use #18 AWG wire for 24V control wiring runs not
exceeding 75 feet. Use #16 AWG wire for 24V control
wiring runs not exceeding 125 feet. Use #14 AWG
wire for 24V control wiring runs not exceeding 200
feet. Low voltage wiring may be National Electrical
Code (NEC) Class 2 where permitted by local codes.
4. Route thermostat wires from sub-base terminals
to the unit. Control wiring should enter through the
condenser panel opening or through curb indicated in
“Electrical Entrance” figure. Connect thermostat and
any accessory wiring to low voltage terminal block
TB1 in the main control box.
NOTE: Field-supplied conduit may need to be
installed depending on unit/curb configuration.
Use #18 AWG solid conductor wire whenever
connecting thermostat wires to terminals on
sub-base. DO NOT use larger than #18 AWG wire. A
transition to #18 AWG wire may be required before
entering thermostat sub-base.
NOTE: Refer to unit wiring diagrams for
thermostat or remote sensor connections.
GAS SUPPLY PIPING
WARNING
To prevent personal injury or death due to
improper installation, adjustment, alteration,
service or maintenance, refer to this manual.
For additional assistance or information,
consult a qualified installer, servicer agency or
the gas supplier.
IMPORTANT NOTE: This unit is factory set to
operate on natural gas at the altitudes shown on
the rating plate.
WARNING
To avoid property damage, personal injury or
death when either using propane gas alone
or at higher altitudes, obtain and install the
proper conversion kit(s). Failure to do so can
result in unsatisfactory operation and/or
equipment damage. High altitude kits are for U.S.
installations only and are not approved for use
in Canada.
The rating plate is stamped with the model number, type of
gas and gas input rating. Make sure the unit is equipped
to operate on the type of gas available. Conversion to
propane (LP) gas is permitted with the use of the factory
authorized conversion kit (see the unit Technical Manual for
the appropriate kit). For High Altitude derates, refer to the
latest edition of the National Fuel Gas Code NFPA 54/ANSI
Z223.1 or National Standard of Canada, Natural Gas and
Propane Installation Code, CSA B149.1.
Installation of this furnace at altitudes above 2000 ft (610
m) shall be made in accordance with the Listed High
Altitude Conversion Kit available with this furnace.”
NATURAL
Min. 5.0" W.C., Max. 10.0" W.C.
PROPANE
Min. 11.0" W.C., Max. 14.0" W.C.
INLET GAS PRESSURE
inlet gas pressure must not exceed maximum value
shown in table above.
The minimum supply pressure should not vary from that
shown in the table above because this could prevent the
unit from having dependable ignition. In addition, gas input
to the burners must not exceed the rated input shown
on the rating plate. Overfiring of the unit could result in
premature heat exchanger failure.
Piping
IMPORTANT NOTE: To avoid possible unsatisfactory
operation or equipment damage due to under
firing of equipment, do not undersize the natural/
propane gas piping from the meter/tank to the unit.
When sizing a trunk line, include all appliances on
that line that could be operated simultaneously.
