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Installation
Component
Pipe Fitting (3/4-in. x 2 1/2-in.)
I
J
K
Pipe Fitting (3/4-in. x 2 1/2-in.)
L
M
N
Pipe Fitting (3/4-in. x 6 1/2-in.)
O
For detailed through-the-base gas installation instructions,
refer to the Through-the-Base Gas Piping 3 to 25 Tons
Gas/Electric Packaged Units Installation Instructions (ACC-
SVN17*-EN) provided with through-the-base gas
installation kit.
Requirements of Gas Heat
The unit gas train and optional through-the-base gas shut-
off valve are rated at 0.50 PSIG maximum. A pressure
reducing regulator is recommended to prevent this
maximum from being exceeded. These components must
be isolated during field gas piping test that exceed 0.50
PSIG.
Important: It is recommended that the field piping be
capped prior to the unit gas train or optional
through-the-base gas shut-off valve if present.
☐ Gas supply line properly sized and connected to the
unit gas train.
☐ All gas piping joints properly sealed.
☐ Gas piping leak checked with a soap solution. If piping
connections to the unit are complete, do not pressurize
piping in excess of 0.50 PSIG or 14-inch w.c. to prevent
component failure.
☐ Drip leg installed in the gas piping near the unit.
☐ Flue exhaust clear of any obstruction.
☐ Supply and manifold pressures should be checked
during unit commissioning (see
Table 7, p.
28).
Table 6. Gas heat data - supply and manifold
pressure requirements – two-stage gas
YZJ150*
150,000-
Heating Input Rate – Btu/h
250,000
Minimum Supply Gas
4.5/11.5
Pressure NG/LP (in. w.c.)
Maximum Supply Gas
Pressure (in. w.c.)
Manifold Gas Pressure –
1st Stage - NG (in. w.c.)
Manifold Gas Pressure –
2nd Stage - NG (in. w.c.)
28
Description
90° Street Elbow
Pipe Union
Gas Shut-off Valve
90° Street Elbow
Table 6, p. 28
and
YZJ(180-300)*
250,000
320,000
400,000
4.5/11.5
14
1.8
1.7
1.8
3.5
3.3
3.5
Table 7. Gas heat data - supply and manifold
pressure requirements - modulating gas
Heating Input Rate — Btu/h
Minimum Supply Gas Pressure NG/LP (in. w.c.)
Maximum Supply Gas Pressure (in. w.c.)
Manifold Gas Pressure – Full Gas Input Rate -
NG/LP (in. w.c.)
Condensate Drain Configuration
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Verify that no power is
present with a voltmeter.
An evaporator condensate drain connection is provided on
each unit. Refer to the ductwork section in the Installation
chapter for the appropriate drain location.
A condensate trap must be installed at the unit due to the
drain connection being on the negative pressure side of
the fan. Install the p-trap using the guidelines in .
A condensate drain line must be connected to the p-trap.
Pitch the drain lines at least 1/2-inch for every 10 feet of
horizontal run to assure proper condensate flow. Do not
allow the horizontal run to sag causing a possible double
trap condition. This can result in condensate backup due to
air lock.
6/11.5
1.7
3.3
Digit 10 = B models
250,000 – 400,000
5/11.5
14
3.5/10
WARNING
RT-SVX077B-EN
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