Optional Gas Heat; Gas Piping; Electric Heat Application Data; Gas Heat Application Data - York SUNLINE MagnaDRY WR300 Installation Manual

TABLE 3: ELECTRIC HEAT APPLICATION DATA
NOMINAL VOLTAGE
HEATER 3-PHASE,
SIZE (KW) 60 HZ
18 208/230,460,575
36 208/230,460,575
208/230
54
460,575
208/230
72
460,575
TABLE 4: GAS HEAT APPLICATION DATA
0 To 2,000 To
2,000 Feet 4,500 Feet
Above
Sea Level Sea Level
Max. Min. Max.
300 150 270
400 200 360
1.
On VAV units, individual VAV boxes must be full open in heating mode to insure airflow falls within
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unless superseded by local codes or gas utility require-
ments. Refer to the Pipe Sizing Table 5.
The heating value of the gas may differ with locality.
The value should be checked with the local gas utility.
NOTE: There may be a local gas utility requirement
specifying a minimum diameter for gas piping.
All units require a one-inch pipe connection at
the entrance fitting.
Johnson Controls Unitary Products
MINIMUM CFM UNIT SIZE
15 TON 20 TON 25 TON
4500
4500
5000
6000 7500
4500
5000
4500
Output Capacity (Mbh)
0 To
2,000 Feet
Above
Above
Sea Level
Min. Max.
135 240
180 320

OPTIONAL GAS HEAT

These gas-fired heaters have aluminized-steel or
optional stainless steel, tubular heat exchangers with
spark ignition with proven pilot.
All gas heaters are shipped from the factory equipped
for natural gas use, but can be field converted to L.P./
Propane with Kit Model # 1NP0418. See Gas Heat
Application Data Table.
2,000 To
4,500 Feet Available
Above on Models
Sea Level
Max.
213 15, 20 & 25 Ton
281 15, 20 & 25 Ton
TABLE 5: PIPE SIZING
Length in Feet
10
20
30
40
50
60
70
80
90
100
Maximum capacity of pipe in cubic feet of gas per hour. (Based upon
a pressure drop of 0.3 inch water column and 0.6 specific gravity
gas).
284813-YIM-C-1008
Temp.
Natural
Rise ºF
Gas
At
Rate
1
Full Input
(Ft./Hr.)
Min. Max.
279 20 50
372 30 60
Nominal Iron Pipe Size
1 in. 1-1/4 in.
520 1,050
350 730
285 590
245 500
215 440
195 400
180 370
170 350
160 320
150 305
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