Johnson Controls UL Listed GS-20 Series Manual page 9

GS-_ _1_
(On/Off
with Flow
Adjustment)
G—UL Listed GS-20/25 and GS-40/45 Series Single-block Multi-function Gas Control Valves Technical Bulletin 9
Adjustments
IMPORTANT: All adjustments must be made in conjunction with the
gas appliance and in accordance with the appliance
manufacturer's instructions. Only authorized
personnel should make adjustments. See each valve
model version for specific adjustments.
!
WARNING: Explosion hazard. The minimum flow rate of the
valve must not be adjusted below the minimum safe
working rate of the appliance.
It is recommended that pressure connections be used to monitor the inlet
and outlet valve pressure while performing each of the specific adjustment
procedures.
This valve provides manual flow adjustment throughout the full range of
zero to maximum flow. For flow rate adjustment, loosen the unsealed
mounting screw on the plastic adjustment knob at the top of the solenoid
coil. Hand turn the adjustment knob clockwise to decrease or
counterclockwise to increase the flow rate through the valve
(see Figure 5). Tighten the mounting screw to secure the adjustment knob
at the desired flow rate.
Figure 5: Manual Flow Adjustment Knob