L4006,L4007 AQUASTAT CONTROLLERS
© 2020 Resideo Technologies, Inc. All rights reserved.
This product is manufactured by Resideo Technologies, Inc. and its affiliates.
www.resideo.com
Resideo Technologies, Inc.
1985 Douglas Drive North, Golden Valley, MN 55422
1-800-468-1502
95-6120B—05 M.S. Rev. 05-20 | Printed in United States
Fig. 7. Typical wiring diagram for 24 V gas system using
L4006C.
Fig. 8. Typical Powerpile system wiring diagram, using
L4006C.
Fig. 9. Typical systems with 120 V electrical heal
primaries, using L4006C.
OPERATION
For proper selection of settings, follow the boiler
manufacturer's recommendations.
1.
High limit controller—shuts off burner if water
temperature exceeds high limit setting. Burner
restarts when temperature drops to high limit set-
ting, less differential.
NOTE:
If L4006E, see Manual Reset below.
2.
Low limit controller—maintains minimum boiler
temperature for domestic hot water. Turns on
burner at temperature setting, minus differential.
3.
Circulator controller—prevents circulation of water
that is not hot enough. Breaks circulator circuit at
temperature setting minus differential, remakes at
setting.
ADJUSTING
Set the differential to correspond with the boiler
manufacturer's recommendations. To adjust models
with adjustable differential, rotate the wheel on the back
of the snap switch until the desired reading is aligned
with the “V” notch in the frame. The wheel provides an
adjustment from 5 F to 30 F (3 C to 1 7 C). Replace the
cover on the Aquastat controller.
Adjust the control point to correspond with the boiler
manufacturer's recommendations. To adjust insert a
screwdriver in the slotted screw type head located
beneath the window in the cover. Turn the scale to the
desired control point.
Manual Reset
If the device includes manual reset (model L4006E), be
sure to press the red reset button on the front of the
case to make sure that the controller is not locked out
on safety. In checking out the system, adjust the limit
setting low enough so that temperature of the controlled
medium reaches the high limit setting. When the limit
setting is reached, the Aqua stat controller locks out and
the burner shuts down. When temperature of the
controlled medium drops to the high limit setting, minus
differential, push the manual reset button and the
system should again be operative. Reset control to
proper high limit setting.
CHECKOUT
Check to make certain 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 under OPERATION.
Further adjustments then can be made to meet more
exact comfort requirements.
24 VOLT
THERMOSTAT
L4006C
HIGH LIMIT
CONTROLLER
VALVE OPERATOR
TRANSFORMER
M1154
1
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
L1
(HOT)
L2
MILLIVOLTAGE
THERMOSTAT
L4006
HIGH LIMIT
CONTROLLER
MILLIVOLTAGE
VALVE OPERATOR
SAFETY
SHUTOFF
PILOTSTAT¨
POWER UNIT
POWER UNIT COIL
OPERATOR
COIL
PILOT
BURNER
M1156C
L1
(HOT)
L2
1
L1
(HOT)
L2
1
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
LINE VOLTAGE
CONTROL CIRCUIT
L4006
LINE VOLT
THERMOSTAT
LOAD
LOW VOLTAGE
CONTROL CIRCUIT
L4006
LOW VOLTAGE
THERMOSTAT
1K
ELECTRIC
HEAT RELAY
LOAD
M1155C
