Pressure Test Gas Piping; High Altitude Derate; Electrical Connections - Lennox LGH 036 Installation Instructions Manual

BOTTOM ENTRY GAS PIPING COMPLETED
GROUND
JOINT UNION
STREET
ELBOW
7" NIPPLE
2-1/2" NIPPLE
DRIP LEG
Grommets for both gas pipe openings are field provided.
FIGURE 12
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 13.
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
LGH/LCH036, 048, 060, 072
TO GAS
VALVE
TO GAS
SUPPLY
MANUAL MAIN
SHUT-OFF VALVE
Page 9
power to unit. These devices should be properly labeled
by the installer.
PRESSURE TEST GAS LINE
MANUAL MAIN
SHUT-OFF VALVE
GAS VALVE
FIGURE 13

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 2 for high altitude adjustments.
TABLE 2
HIGH ALTITUDE DERATE
Altitude Ft.*
2000-4500
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- Units are factory-wired for 230,460,575 volt supply.
For 208V supply, remove the insulated terminal
cover from the 208V terminal on the control
transformer. Move the wire from the transformer
240V terminal to the 208V terminal. Place the
insulated terminal cover on the unused 240V
terminal.
2- Route power through the bottom power entry area
and connect to L1, L2, and L3 on the top of K1 in
control area above compressor. Secure power
wiring with factory-installed wire ties provided in
CAP
Gas Manifold Pressure
See Unit Nameplate