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Overview
There is one UV Ballast Box for each Ventilator section. The UV Ballast Box contains the Ballasts and other
electrical components necessary to operate the UV System (Refer to Figure 5-20-2). A list of all the compo-
nents and their part numbers are shown on Page 6-7 and 6-8. To replace any of the components proceed
as follows:
Ballast
The Ballasts are called Ballast Boards (refer to Figures 5-20-2 and 5-22-1). The number of Ballasts Boards is
dependent upon the number of UV Lamp Modules, one or two. One Ballast Board serves two UV Lamps.
So, for example, if the Ventilator has two UV Lamp Modules then there would be a total of 12 Lamps and
therefore six Ballasts Boards. The Ballasts Boards are mounted on Ballast Board Plates (Refer to Figure 5-20-
2). If the Ventilator has two UV Lamp Modules there are two Ballast Board Plates, one mounted in front of
the other. The Front Ballast Board Plate always serves the left UV Lamp Module and the Rear Ballast Board
always serves the right UV Lamp Module. So, for example if the Ventilator has two Lamp Modules the Front
Ballast Board Plate would have two Ballast Boards and the Rear Ballast Board Plate would also have two Bal-
last Boards.
The Ballast Boards are numbered 1, 2 and 3. Ballast Board number 1 serves Lamp number 1 and 2, Ballast
Board number 2 serves Lamp number 3 and 4, and ballast Board number 3 serves Lamp number 5 and 6.
(Refer to Table T-5-14-1).
There are two Green and two Red Status Lights on a Ballast Board, one set for each Lamp (refer to Figure
5-20-2). The Status Lights are numbered Lamp 1 through 6 to correspond with the Lamp number. A Green
light indicates the Lamp is operational and a Red light indicates the Lamp is not operational and must be
replaced. If both lights are out then the Ballast Board is faulty and it must be replaced.
UV Ballast Box
Table T-5-14-1
Table 5-21-1
Ballast Board / Lamp Chart
Left UV Module
Front Ballast Board
Plate
Serves
Serves
Ballast
Lamp #
Board #
1
1
2
3
2
4
5
3
6
5-14
Right UV Module
Rear Ballast Board
Plate
Serves
Serves
Ballast
Lamp #
Board #
1
1
2
3
2
4
5
3
6
Chapter 5 - Testing and Repair
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