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WARNING
Danger of explosion. Can cause injury
or product or property damage. Do not
use matches, candles, flame or other
sources of ignition to check for leaks.
NOTE-In case emergency shut down is required, turn off
the main manual shut-off valve and disconnect main
power to unit. These devices should be properly labeled
by the installer.
GAS VALVE
CAP
MANUAL MAIN
SHUT-OFF VALVE
FIGURE 11
PRESSURE TEST GAS LINE
High Altitude Derate
Locate the high altitude conversion sticker in the unit
literature bag. Fill out the conversion sticker and affix next
to the unit nameplate.
Refer to table 1 for high altitude adjustments.
TABLE 1
HIGH ALTITUDE DERATE
Altitude Ft.*
Gas Manifold Pressure
2000-4500
See Unit Nameplate
4500 And Above
Derate 2% / 1000 Ft. Above Sea Level
*Units installed at 0-2000 feet do not need to be modified.
NOTE ‐ This is the only permissible derate for these units.
Electrical Connections
POWER SUPPLY
Do not apply power or close disconnect switch until
installation is complete. Refer to start-up directions.
Refer closely to unit wiring diagram.
Refer to unit nameplate for minimum circuit ampacity
and maximum fuse size.
1- 230/460/575 volt units are factory wired.
For 208V
supply,
disconnect the pink wire (230V) at all control
power transformer(s). Reconnect the pink wire
(208V). Tape the exposed end of the 230V pink wire.
2- Route power through the bottom power entry area
and connect to L1, L2, and L3 on the bottom of TB2
in control box for gas units or units equipped with
electric heat. Route power to F4 on cooling only
units (no electric heat). Route power to S48
disconnect switch when the option is
factory-installed. See unit wiring diagram.
3- Connect separate 120v wiring to optional GFCI outlet
pigtails.
CONTROL WIRING
A-Thermostat Location
Room thermostat mounts vertically on a standard 2” X 4”
handy box or on any non-conductive flat surface.
Locate thermostat approximately 5 feet (1524mm)
above the floor in an area with good air circulation at
average temperature. Avoid locating the room
thermostat where it might be affected by:
-drafts or dead spots behind doors and in corners
-hot or cold air from ducts
-radiant heat from sun or appliances
-concealed pipes and chimneys
B-Control Wiring
1- Route thermostat cable or wires from subbase to
control box (refer to unit dimensions to locate bottom
and side power entry).
IMPORTANT - Unless field thermostat wires are rated
for maximum unit voltage, they must be routed away
from line voltage wiring. Use wire ties located near the
lower left corner of the controls hat section to secure
thermostat cable.
Use18 AWG wire for all applications using remotely
installed electro-mechanical and electronic
thermostats.
2- Install thermostat assembly in accordance with
instructions provided with thermostat.
3- Connect thermostat wiring to TB1 terminal board on
the lower side of the controls hat section. Wire as
shown in figure 12 for electro-mechanical and
electronic thermostats. If using other temperature
control devices or energy management systems see
instructions and wiring diagram provided by
manufacturer.
