10
ELECTRICAL ENTRANCE LOCATIONS
Unit is equipped with a Low Voltage Terminal Block and has Single
Point wiring to the contactor.
Low Voltage Control Wiring
1. A 24V thermostat must be installed for unit operation.
It may be purchased with the unit or field -supplied.
Thermostats may be programmable or electromechanical
as required.
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 duct panel
(dimple marks entrance location). 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 hookups.
GAS SUPPLY PIPING
T
O
PREVENT
PERSONAL
INJURY
OR
DEATH
DUE
TO
IMPROPER
INSTALLATION
,
ADJUSTMENT
,
ALTERATION
,
SERVICE
OR
MAINTENANCE
,
REFER
TO
THIS
MANUAL
. F
OR
ADDITIONAL
ASSISTANCE
OR
INFORMATION
,
CONSULT
A
QUALIFIED
INSTALLER
,
SERVICE
AGENCY
OR
THE
GAS
SUPPLIER
.
WARNING
IMPORTANT NOTE:
This unit is factory set to operate on natural
gas at the altitudes shown on the rating plate.
T
O
PREVENT
PROPERTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
WHEN
EITHER
USING
PROPANE
GAS
ALONE
OR
AT
HIGHER
ALTITUDES
,
OBTAIN
AND
INSTALL
THE
PROPER
CONVERSION
KIT
(
S
). F
AILURE
TO
DO
SO
CAN
RESULT
IN
UNSATISFACTORY
OPERATION
AND
/
OR
EQUIPMENT
DAMAGE
.
H
IGH
ALTITUDE
KITS
ARE
FOR
U.S. I
NSTALLATIONS
ONLY
AND
ARE
NOT
APPROVED
FOR
USE
IN
C
ANADA
.
WARNING
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.
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 the 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.
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. The gas line installation must comply
with local codes, or in the absence of local codes, with the latest
edition of the National Fuel Gas Code NFPA 54/ANSI Z223.1.
