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22
BOILER STATUS
DIFFERENTIAL PRESSURE
SWITCH CONTACTS
Not Running
0”
Closed at 3.5”
Closed at 0.5”
Running without Blockage (Approximate)
1.00” For Model--125
Closed at 3.5”
1.50” For Model--150
Closed at 0.5”
1.50” For Model--175
2.00” For Model--200
Running with Blockage
Less Than or Equal to Setpoints
Open at 3.5”
Closed at 0.5”
3
2
1
2"
1
3"
1
5 1/2"
SIGHT GLASS
& ADAPTER
4
13 1/4"
7
4
6"
4
16 1/2"
GAS VALVE
8
6
4
1
4"
4
4"
5
9
9
AIR INLET
CONNECTION
2 @ 2" EA.
A06107
Fig. 20
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Differential Air Pressure