Honeywell Aquastat L7224U Installation Instructions page 4

L7224U OIL AND ELECTRIC BOILER ELECTRONIC AQUASTAT
THERMOSTAT
TERMINALS
T
T 3
TX
TT
B1 ZC C1
ZR
L1
L2
C2
B2
C1
B1
ZC
FLUSH MOUNTING TAB (2)
Fig. 4. Location of L7224U flush-mounting tabs and
Well-Mounted Aquastat
Replacement
Turn off all power and remove the old controller. Refer to
the cover insert of the old controller to identify and tag
each external lead as it is disconnected. If the old well is
unsuitable for the new installation, remove it and proceed
with instructions for new installation. If the old well is
suitable, use it.
1. Loosen, but do not remove, the well clamp screw on
the side of the controller case.
2. Position immersion well clamp snugly over the
flange of the adapter and tighten the clamp screw.
3. Insert the sensor into the well as shown in Fig. 5.
(If desired, distribute the heat-conductive com-
pound in the tube prior to sensor insertion, as
described in New Installation.)
4. Make sure sensor is fully seated to bottom of well
(Fig. 5). Use a small pencil to measure depth of
sensor in well, if necessary.
SENSOR WIRES
Fig. 5. Replacement sensor installation.
69-1720EFS—07
ENVIRACOM TM
TERMINALS
2
DISPLAY
1
LED's
SENSOR
CONNECTOR
SENSOR HOLES
FUSE
LEDs.
BOILER
IMMERSION
SENSOR
WELL
HEAT-CONDUCTIVE COMPOUND
(OPTIONAL)
®
CONTROLLER
Replacement Sensor Installation
Turn off all power and carefully disconnect sensor from
circuit board by pulling gently on the connector.
1. Gently pull sensor from thermo well and through cir-
cuit board by pulling on leadwires.
2. Carefully align replacement sensor with hole in
circuit board and guide through Aquastat case and
into well. Refer to Fig. 5.
3. Make sure sensor is fully seated to bottom of well
(see Fig. 5). Use a small pencil to measure depth of
sensor in well, if necessary.
4. Connect sensor to circuit board by pressing
connector on sensor unit into mating connector on
circuit board (refer to Fig. 6).
5. For remote sensors (flush mounted Aquastat) be
sure to use the 121371AA clamp to securely hold
sensor in place. See Accessories.
M32197
ZR
L1
L2
C2
B2
C1
B1
ZC
Fig. 6. Wiring the Outdoor Reset Module and the
Fuse
The 1 Amp fuse located near the transformer is intended
to protect the EnviraCOM circuit from incorrect wiring. The
Aquastat will continue to function should the fuse blow or
be removed though no EnviraCOM communication will be
possible on the bus and Err 6 will be displayed. See
Table 9.
WIRING
WARNING
Electrical Shock Hazard.
Can cause serious injury or death.
Disconnect power supply before making wiring
connections to prevent electrical shock or
equipment damage.
M22026
All wiring must comply with local electrical codes and
ordinances. Do not exceed the specifications in the
Application section when wiring this controller.
IMPORTANT
The terminals on these Aquastat Controllers are
approved for use with copper wire only.
4
W8735Y1000 OR W8735S1000
OUTDOOR RESET MODULE
(W8735S1000 SHOWN)
1 2 3 OT OT
T
T 3
2
1
Domestic Hot Water Module.
C7089U1006
OUTDOOR
SENSOR
W8735S1008
DOMESTIC HOT
WATER MODULE
1 2 3 TS TS
32003971-003
TEMPERATURE
SENSOR
M34961