Johnson Controls UL Listed GS-20 Series Manual page 7

GS-406_
Connection of
the Impulse
Lines
G—UL Listed GS-20/25 and GS-40/45 Series Single-block Multi-function Gas Control Valves Technical Bulletin 7
1/2 in. NPT Conduit
Thread Adapter
(Factory Installed)
*
Figure 3: Standard Wiring Electrical Connections
The internal diameter of the impulse tubes for the combustion air (P
and the combustion chamber pressure (P
(see Figure 4). Make the connections as short as possible and route to
prevent 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
damage to the tubing and allow for an accurate pressure
reading.
Figure 4: Impulse Line Connections
Electrical Box
Connection
GND
N L1
GND
*
Wiring Connections
L1
N = Common
L1 = Line
N
GND = Earth Ground*
(* Do not connect earth ground for 24 VAC models.)
) should be 4.0 mm (5/32 in.)
F
P P
F A
)
A
if not used.
F