Optional Electric Heat; Optional Gas Heat; Electric Heat Minimum Supply Air - York ZJ150 Installation Manual

Optional Electric Heat

The factory-installed heaters are wired for single point power
supply. Power supply need only be brought into the single point
terminal block.
Table 10: Electric Heat Minimum Supply Air
Size
Model
(Tons)
078
ZJ
(6.5)
090
ZJ
(7.5)
102
ZJ
(8.5)
120
ZJ
(10)
150
ZJ
(12.5)

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followed in all cases unless superseded by local codes or gas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.
Johnson Controls Unitary Products
These CSA approved heaters are located within the central
compartment of the unit with the heater elements extending in
to the supply air chamber.
Fuses are supplied, where required, by the factory. Some kW
sizes require fuses and others do not. refer to Table 10 for
minimum CFM limitations and to Table 8 for electrical data.
Voltage
9
208/230-3-60 1950
460-3-60 1950
600-3-60 1950
208/230-3-60 2250
460-3-60 2250
600-3-60 2250
208/230-3-60 2550
460-3-60 2550
600-3-60 2550
208/230-3-60 -
460-3-60 -
600-3-60 -
208/230-3-60 -
460-3-60 -
600-3-60 -
Figure 25: Side Entry Gas Piping
Minimum Supply Air (CFM)
Heater kW
18 24
1950 1950
1950 1950
1950 1950
2250 2250
2250 2250
2250 2250
2550 2550
2550 2550
2550 2550
3000 3000
3000 3000
3000 3000
3750 3750
3750 3750
3750 3750
1183875-YIM-A-1014
36 54
1950 -
1950 -
1950 -
2250 -
2250 -
2250 -
2550 -
2550 -
2550 -
3000 3500
3000 3000
3000 3500
3750 4000
3750 3750
3750 3750
OPTIONAL
COIL
GUARD
SHOWN
31