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Pressure Test Gas Piping (Gas Units)
When pressure testing gas lines, the gas valve must
be disconnected and isolated. Gas valves can be
damaged if subjected to more than 0.5 psig (3.48kPa).
See figure 11.
NOTE-Codes may require that manual main shut-off
valve and union (furnished by installer) be installed in
gas line external to unit. Union must be of the ground
joint type.
After all connections have been made, check all piping
connections for gas leaks. Also check existing unit gas
connections up to the gas valve; loosening may occur
during installation. Use a leak detection solution or other
preferred means. Do not use matches candles or other
sources of ignition to check for gas leaks.
CAUTION
Some soaps used for leak detection are corrosive
to certain metals. Carefully rinse piping thoroughly
after leak test has been completed. Do not use
matches, candles, flame or othe sources of ignition
to check for gas leaks.
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.
PRESSURE TEST GAS LINE
MANUAL MAIN
SHUT-OFF VALVE
GAS VALVE
FIGURE 11
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. High altitude kits are available for
field-installation.
Refer to table 1 for high altitude adjustments.
2000-4500
4500 And Above
65K-180KBtuh
4500 And Above
240K-480KBtuh
*Units installed at 0-2000 feet do not need to be modified.
NOTE ‐ This is the only permissible derate for these units.
Electrical Connections
A-Wiring
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
2- Route power through the bottom power entry area
3- Route field wiring in field-provided conduit as shown
4- Connect separate 120v wiring to optional GFCI outlet
B-Unbalanced Three-Phase Voltage - VFD
Units are designed to operate on balanced, three-phase
power. Operating units on unbalanced three-phase power
will reduce the reliability of all electrical components in the
unit. Unbalanced power is a result of the power delivery
system supplied by the local utility company.
Factory-installed inverters are sized to drive blower
motors with an equivalent current rating using balanced
CAP
three-phase power. When unbalanced three-phase
power is supplied; the installer must replace the existing
factory-installed inverter with an inverter that has a higher
current rating to allow for the imbalance. Use table 2 to
determine the appropriate replacement inverter.
Page 9
TABLE 1
HIGH ALTITUDE DERATE
Altitude Ft.*
Gas Manifold Pressure
Derate 2% / 1000 Ft. Above Sea Level
Derate 4% / 1000 Ft. Above Sea Level
POWER SUPPLY
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.
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
factory-installed. See unit wiring diagram.
in figure 12.
pigtails.
See Unit Nameplate
when
the
option
is
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