Operating instructions

Honeywell Aquastat Controller L4006A
5
Copper Capillary Tube (to sensing bulb)
Differential Adjustment Wheel
Set-point Indicating Dial
Wire Terminal Screws
Operation - L4006A breaks the circuit on a temperature rise to the control setting.
High limit controller: Shuts off burner when water temperature exceeds high limit setting.
Burner restarts when temperature drops to high limit setting. Low limit controller:
Maintains minimum water temperature. Turns burner on at temperature setting, less
differential. Differential Adjustment wheel, typically used on boiler applications. Factory
set to 5°.
Checkout - Check to make certain that the Aquastat Controller has been installed and
adjusted properly. Put the system into operation and observe the action of the device
through several cycles to make certain that it provides proper control of the system as
described in the Operations section. Further adjustments can be made as required.
5
L4006A Flow Control
To Burner
To Switch
Typical Wiring
11