Commissioning, Startup, Operation,
and Shutdown
Thermostat controlled operation
The valve and pump are ready to communicate with each other out of the box.
The pump comes with an adjustable temperature feature. This feature is controlled by the
thermostat dial just above the timer housing on the body of the pump and may be set to
activate between 86°F (30°C) and 95°F (35°C). This temperature range represents the
desired water temperature to be sensed at the remotely set under-sink mixing valve.
• Slide the switch on the timer housing to the “ON” position.
In the “ON” position, the pump runs automatically whenever the built-in temperature
sensor in the valve senses the need for hot water at the under-sink valve. In the “OFF”
position, the pump does not operate at any time. In either instance, the LED light on the
thermostat knob will remain steady.
The pump will most likely start running immediately and turn off after a few minutes when
hot water reaches the faucet/tap. The pump continues cycling on and off as required
during the programmed sequence of operation. (Do not be concerned if the pump does
not begin to run immediately after the pump is plugged in, or at times throughout normal
operation. This just means that there is already hot water at the hot water faucet/tap. The
pump turns on automatically when the hot water line cools down.)
Thermostat controlled operation Plus Timer
1
2
3
4
1.
Set current time here
2.
Pump runs when valve calls for hot water
3.
Pump runs only during the desired times when valve calls for hot water
4.
Pump does not run
1. Open the timer cover with a small flat head screwdriver. Verify that current time
setting is correct. If not, rotate the dial clockwise until the correct time is aligned with
the pointer at the top (12 o'clock position) of the dial.
Commissioning, Startup, Operation, and Shutdown
Laing Thermotech ACT-4 wireless Potable Hot Water Recirculation Kit Installation, Operation and Maintenance
Manual
13
