5121835-TIM-J-1118
30
Johnson Controls Ducted Systems
Optional electric heat
The factory-installed heaters are wired for single point power
supply. You only need to bring the power supply into the single
point terminal block.
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. See Table 12 for
minimum CFM limitations. See Table 10 for electrical data.
Optional gas heat
The optional gas-fired heaters have aluminized-steel or optional
stainless steel, tubular heat exchangers with spark ignition.
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.
Follow the “National Fuel Gas Code” Z223.1 (in U.S.A.) or the
current Gas Installation Codes CSA-B149.1 (in Canada) in all
cases unless they are superseded by local codes or gas utility
requirements.
Gas pipe sizing - capacity of pipe,
The heating value of the gas may vary by locality. You must
check the value with the local gas utility.
Figure 25: Side entry gas piping
Table 12: Electric heat minimum supply air
Size (tons)
Model
Voltage
Minimum supply air (CFM)
Heater kW
9
18
24
36
54
T06
(6.5)
ZK
208/230-3-60
1950
1950
1950
1950
-
460-3-60
1950
1950
1950
1950
-
600-3-60
1950
1950
1950
1950
-
T07
(7.5)
ZK
208/230-3-60
2250
2250
2250
2250
-
460-3-60
2250
2250
2250
2250
-
600-3-60
2250
2250
2250
2250
-
T08
(8.5)
ZK
208/230-3-60
2550
2550
2550
2550
-
460-3-60
2550
2550
2550
2550
-
600-3-60
2550
2550
2550
2550
-
T10
(10)
ZK
208/230-3-60
-
3000
3000
3000
3500
460-3-60
-
3000
3000
3000
3000
600-3-60
-
3000
3000
3000
3500
T12
(12.5)
ZK
208/230-3-60
-
3750
3750
3750
4000
460-3-60
-
3750
3750
3750
3750
600-3-60
-
3750
3750
3750
3750
Table 13: Gas application data
Unit
Input (MBH)
Output (MBH)
Temp. rise
(
°
F)
Size
Opt.
T06
N12
120
96
20-50
N18
180
144
35-65
T07
N12
120
96
15-45
N18
180
144
30-60
T08
N12
120
96
10-40
N18
180
144
25-55
T10
N18
180
144
20-50
N24
240
192
35-65
T12
N18
180
144
10-40
N24
240
192
25-55
OPTIONAL
COIL
GUARD
SHOWN