Universal Electronic Aquastat®
L7224U1002
Training Module
Includes Honeywell’s AquaReset®
Outdoor Reset Solution
What you will learn
• L7224U Product Overview
• Key Features
• Installation
• Set Up
• Troubleshooting
• Product Cross Reference
• L7224U Advantages
2
L7224U Universal Electronic Aquastat®
• What is the L7224U1002?
- Universal electronic Aquastat
that provides circulator, burner
and boiler temperature control
with electronic temperature
sensing in an oil fired hydronic
heating appliance.
- Provides status and diagnostic
information through an LED
display to enhance the
diagnostic process.
One part number:
L7224U1002
3
Aquastat® Key Features
Electronic
Aquastat®
L7224U1002
• Triple Aquastat (High, Low, Circulator Control)
• Outdoor reset ready
• EnviraCOM™ communications enabled
• Electronic configuration
• Diagnostic updates through LED Display
• Provides multizone control
4
• Horizontal or vertical flange mounting
L7224U Universal Electronic Aquastat
• Why choose the Honeywell L7224U1002?
• Universal Compatibility
• Replaces over 40 existing Honeywell controls
• Easy Installation
• Redesigned to simplify wiring
• Direct or remote mount
• Superior Performance and Accuracy
• +/- 2 degree accuracy
• Multi-Function LED Display
• Speeds installation and troubleshooting
• Push button product set up & configuration
• Get set point, temperature and diagnostic info
• EnviraCOMTM communications enabled
• Easily add outdoor reset with 3 wires
• Remote diagnostics
• OnWatch Diagnotic compatible
5
Additional L7224U features
•Remote 48” sensors available
•One Amp slow-blow fuse
•Improved terminal layout and multiple knockouts
•Vertical, Horizontal, and Flush-Mounting - configurable for singlefunction use
•Low Limit can be disabled (cold start boiler applications)
•Outdoor reset functionality enabled when combined with
W8735S1000 AquaReset® kit
6
L7224U Features
Enviracom™
Terminals
Flush Mounting
Tabs (2)
Push
Buttons – Configuration
Thermostat
Terminals
& Access Diagnostic
Information
EnviraCOM Data port
Digital Display
Line Voltage
Terminals
Keyed Sensor
Connector
Capacitor
Multiple Sensor Holes
Transformer
Fuse
Relays
7
Ranges and Ratings
• Setting Ranges +/-2 Degree Accuracy
130 – 240°F
- High Limit:
- High Limit Differential
(new feature):
- Low Limit:
- Low Limit Differential:
5 – 20°F
110 – 220°F
10 – 25°F
• Electrical Ratings
-
Voltage:
Burner:
Circulator:
Zone Controller (ZC):
120 VAC 60 HZ
7.4 Amps
7.4 Amps
7.4 Amps
• Environmental Ratings
- Temperature:
- Humidity:
8
-30 °F to 150 °F
0 to 95% relative humidity
Installation
Wiring of the L7224U
Well mounting
PN 50001464-001 12 in.
Included in the box
Keyed sensor connector
plugs into circuit board
10
Flush mounting
PN 50001464-005 48 in.
Wiring of the L7224U -- Thermostat
Thermostat
Terminals
T
T
3
2
1
Enviracom™
Terminals
Connect AquaReset® and other
Enviracom devices
11
Wiring of the L7224U – Line Voltage
Line Voltage
Terminals
12
ZR
Power from zone relay
to burner
L1
Power hot
L2
Power neutral
C2
Circulator common
B2
Burner common
C1
Circulator hot
B1
Burner hot
ZC
Power to zone
circulator relay
Connecting AquaReset®
Thermostat
Terminals
T
T
3
2
1
Enviracom™
Terminals
Wire 1,2,3 terminals on Aquastat to 1,2,3 terminals
to the Outdoor Reset Module
13
Connecting AquaReset®
Enviracom™
Terminals
1
2
3
OT OT
Outdoor Sensor
Terminals
Wire 1,2,3 terminals on Aquastat to 1,2,3 terminals
to the Outdoor Reset Module. Mount outdoor sensor
Outside and connect wires to the OT terminals
14
Set Up
Set Up of the L7224U
•
-
•
To adjust the settings
Press the UP, DOWN, and I buttons simultaneously for three
seconds
Press the I button until the desired feature is displayed
Then press UP and/or DOWN to move the set points to desired
values
After 60 seconds without any buttons pressed, the control
automatically goes back to READ mode
Display
-
In RUN mode the Aquastat will flash boiler temp (bt) followed by the
temperature
To read settings press the I key to scroll thought the functions
Increase value
of setting
Decrease value
of setting
I
16
Cycles through
Settings & conditions
Set Point Adjustments
Increase value
of setting
Decrease value
of setting
I
17
Cycles through
Settings & conditions
L7224U Electronic Aquastats®
(LED LIGHTS)
EnviraCOM
Network Active
Thermostat
Calling
Burner
Energized
18
Power to
Zone Circulator
Interrupted
Circulator
Powered
Digital Readout of System Conditions
Run mode – display shows boiler temperature
LED display
Push “I” button
to see other values
19
Text
Description
bt
Boiler Temperature
HL
High Limit
LL
Low Limit
Hdf
High Limit Differential
Ldf
Low Limit Differential
tt
Local Thermostat Status
tte
Enviracom Thermostat Status
brn
Burner Status
cir
Circulator Status
Zc
Zone Control
Zr
Zone Request
err
Error Code
°f
Degrees Fahrenheit
°c
Degrees Celsius
Display
Shows
Digital Readout of System Outdoor Reset Functions
The following messages are only available when connected to a
W8735S1000 outdoor reset kit and/or W8735S1008 domestic hot
water priority kit
LED display
Text
Description
duu ZR configured as Domestic
Hot Water Request
ASC Anti Short-Cycle timeout
bSP Boiler Setpoint
dhc DHW module connected
Push “I” button
to see other values
20
ot
Outdoor temperature
otL
Outdoor temperature low
otH
Outdoor temperature high
btL
Boiler temperature low
bP
Boost Period
bS
Boost step
UUS Warm weather shutdown
temperature
Display
Shows
L7224U Electronic Aquastats®
(Digital Readout of System Conditions)
Run mode – display shows boiler temperature
LED display
Technicians
Quick
Reference
Guide #69-1957
Push “I” button
to see other values
21
Troubleshooting
Troubleshooting: L7224U Electronic Aquastats®
(Error Codes)
• Is there an error code on the display?
Error
Code
• Err 1
• Err 2
• Err 3
• Err 4
• Err 5
• Err 6
• Err 7
• Err 8
23
Cause/Action
Sensor fault; check sensor
ECOM fault; check EnviraCOM™ wiring
Hardware fault; replace control
B1 fault; check B1 wiring/voltage
Low line voltage; check L1-L2 110 Vac
Fuse; check ECOM wires, replace fuse
EEPROM, HL, LL, Hdf, Ldf; Reset to
default values. Restore desired settings.
Repeated B1 fault (voltage present at B1 when output is
turned off); check B1 wiring/voltage
Troubleshooting: L7224U Electronic Aquastats®
(AquaReset Error codes)
• Is there an error code on the display?
Error
Code
• Err 9
• Err 10
• Err 11
Cause/Action
Outdoor reset system failure, check wiring
Boost Failure, check outdoor reset curve settings
Domestic Hot Water module failure, check wiring
• Error codes 9, 10 and 11 only apply when AquaReset and/or Domestic Hot
Water priority modules connected to Aquastat
24
Troubleshooting: L7224U Electronic Aquastats®
On Watch QuickLookTM 72
•
25
For Honeywell EnviraCOM™ enabled equipment
- Read EnviraCOM™ Error Codes
- Line Voltage
- Aquastat Well Temperature
- The QuickLookTM 72 is available through www.onwatchinc.com
Product Cross Reference
Product Cross Reference
• Where do I find Honeywell universal electronic
aquastat cross reference information?
- www.customer.honeywell.com
- Honeywell Application Selection and Cross
Reference Guide – Form 63-9575
- Honeywell Laminated Truck Visor – Form 63-9581O
- Honeywell Residential Technical Support: 1-800-468-1502
63-9581O
27
63-9575
Aquastat® Cross Reference Table
This chart can be found in the Residential
Combustion Application Guide: Form #63-9575
28
www.customer.honeywell.com
• See Cross Reference Search box in right column.
29
L7224U Advantages
• When promoting the Honeywell L7224U1002 keep these
advantages in mind:
• This Universal control replaces over 40 existing Honeywell controls.
• Save time searching for the exact replacement parts
• Stock less parts on the shelf and in the truck
• Installation is easy with this redesigned control.
• Wiring has been simplified
• Mounting choices - control can be direct or remote mount
• Performance and accuracy are superior to past controls.
• +/- 2 degree accuracy
• The multi-function LED display means less time spent on installation
and troubleshooting.
• Push button product set up & configuration
• EnviraCOMTM communications enabled is an added advantage
providing remote diagnostic capabilities.
30
L7224U Universal Electronic Aquastat Knowledge Test
• Now that you completed this training module, take
the short quiz to test your knowledge.
31
Test
1. The L7224U provides temperature control of
circulators, burners and boilers with
electronic temperature sensing? T of F
2. The L7224U is considered a single function
aquastat which provides high limit and low
limit control? T or F
3. The L7224U is accurate within +/- 2 degrees?
T or F
4. A 48” sensor is available to accommodate
application requirements? T or F
5. Setpoints are easily adjusted with the up and
down push buttons? T or F
32
Test
6. The “I” button cycles through settings and
conditions? T or F
7. Error codes can be read only through the
LED display? T or F
8. The low limit can be disabled for a cold
start boiler application? T or F
9. Honeywell provides cross reference
information for replacing over 40 existing
controls? T or F
10.The L7224U has a LED light that shows
whether the burner is energized? T or F
33
Answer Key
1. T
2. F
3. T
4. T
5. T
6. T
7. F
8. T
9. T
10. T
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