Table of Contents
Advertisement
MODEL 3250- lus
Temp Limit / LWCO Control
with Thermal Targeting
for Water Boilers
120 VAC Operating Voltage
PATENT NO. 7,891,572
Three Function
Design
Temperature Limit Control
Designed for cold start and tankless
coil boilers.
Low Water Cut-Off
Provides protection against potentially
dangerous low water conditions
when installed with the Hydrolevel
Electro-Well™ (see page 2 for details).
Boiler Reset Control
•
Thermal Targeting – On-board micro-
processor adjusts boiler temperature
based on heating demand.
•
Outdoor Reset Ready – Compatible with
Hydrolevel OS-100 Outdoor Sensor Kit
(sold separately) for outdoor reset and
warm weather shut-down functionality
WARNING
Electrical shock hazard. To prevent electrical shock, death or
equipment damage, disconnect power supply before
installing or servicing control. Only qualified personnel may install or service this control in
accordance with local codes and ordinances. Read instructions completely before proceeding.
WARNING
Frozen pipes/water damage. Central heating systems are prone to shut down as a result of power or fuel outages,
safety related fault conditions or equipment failure. Installation of freeze protection monitoring or other precautions
is recommended for unattended dwellings in climates subject to sustain below-freezing temperatures.
83 Water Street • New Haven, CT 06511 • Phone (203) 776-0473 • F X (203) 773-1019 •
INSTALLATION INSTRUCTIONS
and OPERATING MANUAL
• Saves Fuel – Features Thermal Targeting™ technology and
Thermal Pre-Purge capability
• Outdoor Reset Ready – Provides Outdoor Reset and Warm Weather
™
Shut-Down capability with the addition of Hydrolevel OS-100 Outdoor
Sensor Kit (sold separately)
• Universal Design – Replaces common cold-start and triple-action
Aquastats*
• Operating Indicators – LEDs, Dynamic Display and Test Button provide
continual and on-demand status checks
• Prioritizes Domestic Hot Water – Gives priority to low limit setting or to
calls from indirect water heater
• Reduces Condensation – Holds circulator off until boiler reaches 125°F
•
*Aquastat is a registered trademark of Honeywell International, Inc.
.
CAUTION
should be thoroughly cooled before installing or
servicing control.
1
To prevent serious
burns, boiler
www.hydrolevel.com
Advertisement
Table of Contents
Troubleshooting
Summary of Contents for HydroStat 3250-Plus
- Page 1 INSTALLATION INSTRUCTIONS and OPERATING MANUAL MODEL 3250- lus • Saves Fuel – Features Thermal Targeting™ technology and Thermal Pre-Purge capability Temp Limit / LWCO Control • Outdoor Reset Ready – Provides Outdoor Reset and Warm Weather with Thermal Targeting ™ Shut-Down capability with the addition of Hydrolevel OS-100 Outdoor Sensor Kit (sold separately) for Water Boilers...
- Page 2 FIG. 2 FIG. 3 NOTE: In the case of space restrictions, the Fuel Smart HydroStat control may be mounted in a horizontal orientation without any loss of function. Hydrolevel recommends vertical mounting, when possible, for proper orientation of LED display.
- Page 3 WIRING WARNING Electrical shock hazard. To prevent electrical shock, death or equipment damage, disconnect power supply before installing or servicing this control. Connect 120 VAC Hot to terminal L1. Connect Connect the burner circuit to B1-B2. 120 VAC Neutral to terminal L2. Disconnect means and (B2 is neutral.) STEP 1 STEP 2...
- Page 4 WIRING WARNING Electrical shock hazard. To prevent electrical shock, death or equipment damage, disconnect power supply before installing or servicing this control. NOTE: For proper operation of the boiler reset function, all heating thermostats must input to T-T or ZC-ZR terminals as indicated below. Jumping the T-T terminals and wiring the thermostat to the primary will override the economy feature.
- Page 5 WIRING WARNING Electrical shock hazard. To prevent electrical shock, death or equipment damage, disconnect power supply before installing or servicing this control. NOTE: For proper operation of the boiler reset function, all heating thermostats must input to T-T or ZC-ZR terminals as indicated below. Jumping the T-T terminals and wiring the thermostat to the primary will override the economy feature.
- Page 6 WIRING WARNING Electrical shock hazard. To prevent electrical shock, death or equipment damage, disconnect power supply before installing or servicing this control. NOTE: For proper operation of the boiler reset function, all heating thermostats must input to T-T or ZC-ZR terminals as indicated below. Jumping the T-T terminals and wiring the thermostat to the primary will override the economy feature.
-
Page 7: Setting The Control
SETTING THE CONTROL Diagnostic LEDs Test/Settings Button Dynamic Jumper Display Water Temperature and Real Time Zone/Indirect Switch Verification of Setting Adjustments. Indicator Light (announces heat call) Low Temperature Limit Setting High Temperature (OFF or 110°-200°F) Limit Setting Factory OFF (100°-220°F) Factory 190°F Economy Dial (OFF or LO, 1, 2, 3,... -
Page 8: System Start-Up
Thermal Targeting technology analyzes thermostat activity and continually evaluates how much heat the house requires. When it is very cold outside, the heat demand is high and the Fuel Smart HydroStat will raise the boilerʼs Target temperature to provide needed heat to the home. When the outside temperature is milder, the heat demand is lower. During these periods, the Fuel Smart HydroStat will lower the boilerʼs Target temperature –... - Page 9 Manual Reset Low Water Cut-Off The low water cut-off operation on the HydroStat can be set to operate in automatic (default) or manual reset mode. When in manual reset mode, the control will shut-down the burner immediately when a low water condition is detected. If the low water condition is sustained for 30 seconds, the low water light will blink, indicating that the control has locked out the burner.
-
Page 10: Restore Factory Default Settings
Low Water Cut-Off ON Function Low Water Cut-Off OFF Restore Factory Restore Defaults Defaults Do Not Restore Defaults NOTE: If the HydroStat is factory-equipped on a boiler, some options may be set differently from the default settings. SEE PAGE 7 FOR ADDITIONAL SETTINGS... - Page 11 LWCO ACTIVE Indicates that the low water cut-off (LWCO) function of the Fuel Smart HydroStat is active. When TEST/SETTINGS Button the control is installed with a Hydrolevel Electro-Well™, this To Test Low Water Cut-Off: Press and hold the Test/ LED will be on at all times when the control is powered.
-
Page 12: Troubleshooting
For boilers equipped with a tankless coil, make sure the low limit setting on the HydroStat is set properly. NOTE: If the low limit setting is dialed fully counter clockwise, it will shut off the low temperature maintenance feature and will function as a cold start control. - Page 13 Low Temperature Limit to maintain temperature. Is There The Control HydroStat is supplying 120 VAC to the burner circuit. 120 VAC is Operating Between B1 Recheck wiring and operation of burner and other limit controls. Properly.
- Page 14 Is the Check temperature display. When the Low Limit is Low Limit Dial set, the HydroStat will fire the burner until the Set to OFF? temperature reaches the Low Limit Setting. When there is no call to fire the burner, the voltage...
- Page 15 Fuel Smart HydroStat installed with Electro-Well™ When installed with the Hydrolevel Electro-Well™, Fuel Smart HydroStat will provide both temperature and low water cut-off functionality. If the control was supplied by the boiler manufacturer, it was installed with an Electro-Well™. The Electro-Well™ is available separately for field installations.
- Page 16 OUTDOOR SENSOR KIT Hydrolevel's optional Outdoor Sensor Kit automatically activates outdoor reset functionality and warm weather shutdown capa- bility when plugged in to the Fuel Smart HydroStat control. This low cost, easy to install kit is available separately at Hydrolevel distributors.
Need help?
Do you have a question about the 3250-Plus and is the answer not in the manual?
Questions and answers
is there a way to connect a c- wire?
To connect a C-wire to the HydroStat 3250-Plus, you have a few options:
1. Check for an Available C Terminal: The HydroStat 3250-Plus may not have a dedicated C terminal. If it does, connect the C-wire from your thermostat to this terminal.
2. Use a Separate 24V Transformer: If no C terminal is available, you can install a separate 24V transformer. Run one wire from the transformer to the C terminal on the thermostat and the other to the R terminal on the thermostat. This creates a separate power circuit for the thermostat.
3. Use a C-Wire Adapter: If running a new wire is difficult, a C-wire adapter (also known as a power extender) can be used to simulate a C-wire connection.
4. Check the HydroStat Wiring: If your system has only two wires (R and W), you might need to upgrade the wiring or use an external transformer to provide continuous power.
Before making any connections, ensure the power is off and verify voltages to avoid damage.
This answer is automatically generated
Circulater runs constantly
The HydroStat 3250-Plus circulator may run constantly if the SR503 is not powered correctly. The SR503 needs to be powered constantly to L1 and L2, and the jumper between ZR and ZC must be removed. If this wiring is not set up properly, the circulator may not follow the intended control logic and could stay on continuously. Additionally, the HydroStat holds the circulator off until the boiler reaches 125°F to reduce condensation, so incorrect wiring or settings could override this function.
This answer is automatically generated