Modine MDB Série Manuel D'installation Et De Maintenance page 17

PiPinG control caBinet comPonents
Figure 17.1 - typical Gas control string through
400 mBh
12b
12a
11
10
9
8
Figure 17.2 - typical Gas control string over
400 mBh through 720 mBh
11
10
1. Main Gas Hand Shut-Off Valve
2. Pilot Gas Hand Shut-Off Valve
3. Main Gas Regulator
4. Inlet Gas Pressure Test Port
5. Main Gas Solenoid Valve
6. Redundant Main Gas Solenoid Valve
7. Mod. Valve Inlet Gas Pressure Test Port
8. Pilot Gas Regulator
8.a. Pilot Gas Solenoid Valve (Above 720MBH)
9. Optional Inlet On/Off Stat
10. Mod. Valve Hand Shut-Off Valve
11. Modulating Main Gas Valve
12.a Low Air-Flow Proving Switch (PS-10)
12.b High Airflow Cutoff Switch (PS-11)
13. Ignition Transformer
14. Optional Gas Pressure Switch
The piping arrangements shown are typical and may not match
the unit supplied. Refer to the manifold piping diagram and wiring
diagram that shipped with the unit for actual arrangement.
13
1
2
3
7
6
14
12a
3
1
6
7
13
Figure 17.3 - typical Gas control string 720 through
1000 mBh
11
4
10
5
4
Figure 17.4 - typical Gas control string over
1000 mBh
12b
8
2
4
5
4
7-500.10
6
1
8
2
3 (inside cover)
6
11
10
1
8
2
5
3
8a
5
8a
17