RT-SVX075A-EN
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 “Gas
Heat Operation and Maintenance,” p. 61.
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 Figure 50, p. 37
and Figure 51, p. 37.
3. Route field piping through this hole to the dimension
shown in Table 4, p. 37.
4. Place the assembly through the cabinet opening as
shown in Figure 51, p. 37 and Figure 52, p. 38, and
make the union connection to the field piping and to the
gas train.
Table 4. Through-the-base gas piping dimension
Model Dimension A (inch)
YHJ(072-150)A**(0,A) (L, M, H) 4 5/8
YHJ(180-300)A**(0,A)(L, M, H) 1 3/16
Figure 50. Through-the-base gas pipe height
A
Customer Gas Supply Pipe
Grommet
DETAIL A
Figure 51. Through-the-base gas pipe assembly for YHJ(180-300)A
Support Plate
90 Elbow
3/4" x 8 1/2" Pipe Nipple
Tee
3/4" x 4" Pipe Nipple
3/4" x 2 1/2" Pipe Nipple
Cap
90 StreetElbow
90 Street Elbow
3/4" x 6 1/2" Pipe Nipple
3/4" x 2 1/2" Pipe Nipple
Gas Shut-off Valve
Pipe Union
SEE DETAIL A
Grommet
Grommet
Installation
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