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The internal diameter of the impulse tubes for the combustion air (P
GM-4_6_
the combustion chamber pressure (P
Connection of
Figure 5. Make the connections as short as possible and route to prevent
Impulse Lines
the entry of condensate into the controller. The installation of a
condensation trap in the connection line from the combustion chamber is
highly recommended. Do not close the connection for P
IMPORTANT: Avoid sharp bends or kinks in the tubing to avoid
G—GM-20/25 and GM-40/45 Series Dual-block Multi-function Gas Control Valves Technical Bulletin 9
All manuals and user guides at all-guides.com
damage to the tubing and allow for an accurate pressure
reading.
Figure 5: Impulse Line Connections
) should be 4.0 mm (5/32 in.), see
F
P
P
F
A
) and
A
if not used.
F
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