Optional Gas Heat; Gas Pipe Sizing - Capacity Of Pipe; Side Entry Gas Piping; Bottom Entry Gas Piping - York ZS Series Installation Manual

Optional Gas Heat

These gas-fired heaters have aluminized-steel or optional
stainless steel, tubular heat exchangers with spark ignition.
NOTE: On VAV units, individual VAV boxes must be fully open
in heating mode to insure airflow falls within specified
Temperature Rise range.
Gas Piping
Proper sizing of gas piping depends on the cubic feet per hour
of gas flow required, specific gravity of the gas and the length of
run. "National Fuel Gas Code" Z223.1 (in U.S.A.) or the current
Gas Installation Codes CSA-B149.1 (in Canada) should be
followed in all cases unless superseded by local codes or gas
utility requirements. Refer to the Pipe Sizing Table 11. The
heating value of the gas may differ with locality. The value
should be checked with the local gas utility.
Figure 25: Side Entry Gas Piping
Johnson Controls Unitary Products
Figure 26: Bottom Entry Gas Piping
OPTIONAL
COIL
Table 11: Gas Pipe Sizing - Capacity of Pipe
GUARD
Length of
SHOWN
NOTE: Maximum capacity of pipe in cubic feet of gas per hour
NOTE: There may be a local gas utility requirement specifying a
Nominal Iron Pipe Size
Pipe (ft.)
3/4 in.
10 278
20 190
30 152
40 130
50 115
60 105
70 96
80 90
90 84
100 79
based upon a pressure drop of 0.3 inch W.C. and 0.6
specific gravity gas.
minimum diameter for gas piping. All units require a 3/4
inch pipe connection at the entrance fitting. Line should
not be sized smaller than the entrance fitting size.
518676-BIM-C-0610
OPTIONAL
COIL
GUARD
SHOWN
1 in. 1-1/4 in.
520 1050
350 730
285 590
245 500
215 440
195 400
180 370
170 350
160 320
150 305
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