KI-OM-0591 Rev 3
5
Introduction
1.5
Heater System and Heater Selection
The heaters are arranged into heater banks comprised of groups of heater elements. Each
heater bank is controlled by a switch mounted in the control panel. The switch supplies 24V to
the coil of the contactor/s of the relevant bank. The following table shows the control structure
of the heater banks and the composition of the heater groups.
Table 1 Heater Component Identification
Note
The total heater bank capacity is the combined capacity of the related element
grouping. (e.g. Heater bank 5 = Heaters H5.1, H5.2, H5.3 & H5.4 = 24 kW + 24 kW =
48 kW)
The grouping of heater elements into banks allows the sequential switching of the banks,
reducing the instantaneous load on the power supply. Additionally, as heater banks have
separate control circuits and protection, the failure of any single bank of heaters will not affect
the operation of the other banks.
1.6
Control System
The 24 VDC control circuit is used to control the contactors, relays, timer and the safety
circuits in the system. The contactors, controlled by switches mounted in the control panel
door, switch the high voltage to the heaters and the pump.
The temperature of the output fluid is regulated by dumping excess capacity thereby
increasing the flow rate of fluid through the heater tank and lowering the output temperature
Bank
No.
Switch
No.
Element
Grouping
No.
Element Group-
ing Composition
Circuit
Breaker
ID
Contactor
ID
Element
Grouping
kW
Total
Bank
kW
1
1
Heater H1.1 3 x 4.5 kW Elements MCB3
C2
13.5
13.5
2
2
Heater H2.1 3 x 4.5 kW Elements MCB4
C3
13.5
27.0
Heater H2.2 3 x 4.5 kW Elements MCB5
C4
13.5
3
3
Heater H3.1 3 x 4.0 kW Elements MCB6
C5
25.5
39.0
Heater H3.2 3 x 4.5 kW Elements
Heater H3.3 3 x 4.5 kW Elements MCB7
C6
13.5
4
4
Heater H4.1 3 x 4.0 kW Elements MCB
C7
25.5
49.5
Heater H4.2 3 x 4.5 kW Elements
Heater H4.3 3 x 4.0 kW Elements MCB
C8
24.0
Heater H4.4 3 x 4.0 kW Elements
5
5
Heater H5.1 3 x 4.0 kW Elements MCB10
C9
24.0
48.0
Heater H5.2 3 x 4.0 kW Elements
Heater H5.3 3 x 4.0 kW Elements MCB11
C10
24.0
Heater H5.4 3 x 4.0 kW Elements
Summary of Contents for WHE - 3
Page 2: ......
Page 6: ...vi KI OM 0591 Rev 3 Intentionally blank ...
Page 8: ...viii KI OM 0591 Rev 3 Intentionally blank ...
Page 46: ...38 KI OM 0591 Rev 3 Part Identification Intentionally blank ...
Page 56: ...B 2 KI OM 0591 Rev 3 Intentionally blank ...
Page 61: ...KI OM 0591 Rev 3 C 5 Sheet 2 of 2 ...
Page 62: ...C 6 KI OM 0591 Rev 3 WHE 3 Electrical Schematic 440 V Heater Circuit With Remote ...
Page 63: ...KI OM 0591 Rev 3 C 7 WHE 3 Electrical Schematic With Remote Busbar Manufacturing Detail ...
Page 65: ...KI OM 0591 Rev 3 C 9 Sheet 2 of 2 ...