Trane Precedent YHJ072A Installation, Operation And Maintenance Manual page 37

• Connect properly sized and protected power supply
wiring to a field-supplied/installed disconnect switch
and to the main power terminal block (HTB1) in the unit
control panel.
• Install proper grounding wires to an earth ground.
Through-the-Base Gas
Installation
Important: All phases of this installation must comply with
NATIONAL, STATE, and LOCAL CODES. In
absence of local codes, the installation must
conform with American National Standard-
Z223.1a- National Fuel Gas Code Latest
Revision.
Note: For complete Gas Heat User information, Operation,
Start-up, Shutdown and Maintenance refer to
Heat Operation and Maintenance," p.
1. Field connections are made by first removing the
access panel for the heat section on the front of the
unit.
2. The gas piping assembly ships inside this section and
includes the shut-off valve, a pressure tap for testing,
and the necessary unions for field connection. For
through the base access, remove the factory-provided
cap from the base pan opening. See
and Figure 51, p. 37.
Figure 51. Through-the-base gas pipe assembly for YHJ(180-300)A
3/4" x 6 1/2" Pipe Nipple
90 Street Elbow
Gas Shut-off Valve
3/4" x 2 1/2" Pipe Nipple
Pipe Union
90 StreetElbow
RT-SVX075A-EN
"Gas
61.
Figure 50, p. 37
Grommet
Grommet
3. Route field piping through this hole to the dimension
shown in Table 4, p.
4. Place the assembly through the cabinet opening as
shown in Figure 51, p. 37
make the union connection to the field piping and to the
gas train.
Table 4. Through-the-base gas piping dimension
Model
YHJ(072-150)A**(0,A) (L, M, H)
YHJ(180-300)A**(0,A)(L, M, H)
Figure 50. Through-the-base gas pipe height
A
DETAIL A
3/4" x 8 1/2" Pipe Nipple
Tee
3/4" x 4" Pipe Nipple
Cap
3/4" x 2 1/2" Pipe Nipple
37.
and Figure 52, p.
Dimension A (inch)
4 5/8
1 3/16
Customer Gas Supply Pipe
Grommet
90 Elbow
SEE DETAIL A
Support Plate
Installation
38, and
37