38
RT-SVX075A-EN
Figure 52.
Through-the-base gas pipe assemblies for
YHJ(072-150)A
A
B
C
D
A
E
F
G
H
J
K
L
M
I
1/2” and 3/4” Gas Pipe Connection
Table 5.
Through-the-base gas pipe assembly
components for YHJ(072-150)A (inch)
Component
Description
Connection Size
1/2 inch
3/4 inch
A
Grommets
½
¾
B
TBUG bracket
-
-
C
90° Elbow
½
¾
D
Pipe fitting
½ x 7¼
¾ x 6½
E
Gas ball valve
½
¾
F
Street elbow
½
¾
G
Pipe fitting
½ x 2 ½
¾ x 2¼
H
Tee pipe
½
¾
I
Pipe fitting
½ x 4
¾ x 4
J
Pipe cap
½
¾
K
Pipe fitting
½ x 2 ¾
¾ x 2
L
Pipe union
½
¾
M
Pipe fitting
½ x 4 ½
¾ x 5¼
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. 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.
Table 6.
Gas heat data
YHJ(072-150)A
YHJ(180-300)A
Heating Input Rate —
Btu/h
80,000 – 250,000
250000
320000
400000
Minimum Supply Gas
Pressure NG/LP (in. w.c.)
4.5/11.5
4.5/11.5
6/11.5
Maximum Supply Gas
Pressure (in. w.c.)
14
Manifold Gas Pressure – 1st
Stage -NG (in. w.c.)
1.8
1.7
1.8
1.7
Manifold Gas Pressure –
2nd Stage -NG (in. w.c.)
3.5
3.3
3.5
3.3
Condensate Drain Configuration
WARNING
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.
The 6 to 12.5 tons condensate drain pan is convertible.
Refer to the ductwork section in the Installation chapter for
the drawings. It can be converted to drain condensate out
the front side of the unit or through the base.
To convert drain condensate out the front of unit:
1.
Remove evaporator access panel and supply air
access panels.
2.
Remove the support panel that the condensate drain
