Installation & Operation Manual
The Knight XL - How it works... (continued)
36. Air pressure switch | 37. Pump relay board |
The air pressure switch detects blocked flue/inlet conditions.
The pump relay board is used to connect the boiler, system and DHW pumps.
Model 399
32
31
10
24
18
22
33
15
11
6
Front View - Model 399 | Rear View - Model 399 |
19
27
36
7
8
14
29
13
28
4
5
25
2
26
21
37
16
1
3
34
20
23
Left Side (inside unit) - Model 399
30
17
Right Side (inside unit) - Model 399
5
