Note: This is a control system which must be cleaned and maintained regularly (see Maintenance Guide and Record card included with valve shipment).
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Installation, Operation and Maintenance Guide
G3900LF Series Thermostatic Mixing Valves
Hot Supply
Cold Supply
To Hot Water Source
Hot Inlet
Cold Inlet
Hot Supply
Adjustment
Screw
Cold Supply
To Hot Water Source
Primary Thermostatic
Mixing Valve
Hot Inlet
Cold Inlet
Required Piping Method
G3900LF
G3950LF
This unit must be cycled each time the emergency equipment is inspected (See ANSI Z358.1, Maintenance and Training Section).
1. Set the thermostatic mixing valve to full hot. (primary
thermostatic mixing valve on the G3950LF)
2. Activate emergency equipment and allow temperature to
reach set point.
3. Turn (primary) thermostatic mixing valve to full cold and
wait ten seconds.
4. Turn (primary) thermostatic mixing valve to full hot and wait
ten seconds.
5. Verify outlet temperature does not exceed 90°F (32°C).
6. Turn (primary) thermostatic mixing valve to full cold and
wait ten seconds.
7. If necessary, adjust high temperature limit stop (see page
2). Then set (primary) mixing valve to desired operating
temperature and deactivate emergency equipment.
The G3950LF Redundant Thermostatic Mixing Valve has been factory set at 90°F (32°C). This set point can be adjusted with a 3/8” wrench
(see above). Twisting the adjustment screw clockwise will increase the temperature. Maximum set point is 100°F (38°C).
Required when hot water must be circulated to a thermostatic mixing valve that is a substantial distance from the hot water
source. Recommended hot water inlet temperature is 135°F (57°C).
