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UNIT HEATER
2
3
1
Dungs MBDLE 405 BO1 Main gas valve
Johnson GM 2031 0240 Main gas valve
4
5
The main gas control valve used on all versions of the models CUHA/A, CUHB/A, CUHC/A and
CUHD/A 340 and 380 is the Johnson GM 240 9001 combination gas valve or alternative Dungs
MBDLE 405 BO1 (see Fig 4.4). These controls contain two main safety shut off valves and burner
pressure regulator.
1. Pressure regulator under swivel cover
2. Slow opening adjustment
3. Throughput adjuster (Always fully open)
4. Inlet flange with inlet pressure test point
5. Outlet flange with outlet pressure test point
Fig 4.4 Main gas valves for Models 340 and 380
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