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Installation & Operation Manual
Front View - Model 399
4
5
25
30
23
20
28
13
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14
8
7
27
36
Left Side (inside unit) - Model 399
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16
1
3
34
17
26
2
37
Right Side (inside unit) - Model 399
The Knight XL - How it works... (continued)
Rear View - Model 399
5
Model 399
10
24
32
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6
15
33
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36. Air pressure switch
The air pressure switch detects blocked flue/inlet conditions.
37. Pump relay board
The pump relay board is used to connect the boiler, system and
DHW pumps.