HydroStat 3250-Plus User Manual

1
83 Water Street • New Haven, CT 06511 • Phone (203) 776-0473 • FAX (203) 773-1019 • www.hydrolevel.com
MODEL 3250-Plus
Temp Limit / LWCO Control
with Thermal Targeting
™
for Water Boilers
120 VAC Operating Voltage
PATENT NO. 7,891,572
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.
CAUTION
To prevent serious
burns, boiler
should be thoroughly cooled before installing or
servicing control.
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.
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.
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.
HydroStat 3250-Plus Instructions: HydroStat Instructions.8pg 11/14/13 3:43 PM Page 1

HydroStat 3250-Plus Specifications

Power

input voltage	120 VAC, 60 HZ

Operating Environment

operating range – low limit	Off or 110°F (43°C) - 200°F (93°C)
operating range – high limit	100°F (38°C) - 220°F (104°C)
operating range – differentials	Automatic

Electrical

burner contacts	7.4 FLA, 44.4 LRA@120 VAC
circulator contacts	5.8 FLA, 34.8 LRA@120 VAC
thermostat heat anticipator setting	0.2A

Summary

Installation and Operation Manual

Three Function Design

Mounting the Control

Wiring Overview

Wiring Diagrams: Heating Only & Indirect Systems

Heating Only System Wiring

Wiring for single/multiple circulators without indirect water heaters.

Heating & Indirect Water Heater Wiring

Wiring for systems with indirect water heaters, single/multiple circulators.

Wiring Diagrams: Indirect System Details

Multiple Circulator Wiring with Priority Zone

Diagram for multiple circulators with priority zone control.

Single Circulator Wiring with Zone Valves

Diagram for single circulator with zone valves and indirect water heater.

Wiring Diagrams: Indirect System Details Continued

Multiple Circulator Wiring: Three Zone Relay

Diagram for multiple circulators using a three zone switch relay.

Setting the Control

Setting the High Limit Temperature

Instructions for adjusting the maximum operating temperature of the boiler.

Setting the Low Limit Temperature

Guidance on setting the minimum temperature for tankless coils or domestic hot water.

Setting the Economy Feature

How to configure the fuel-saving feature based on the number of heating zones.

Setting the Zone/Indirect Switch

Configuration for prioritizing indirect water heater calls over space heating.

How Thermal Targeting Works

LED Legend and Test/Settings Button

Troubleshooting

Troubleshooting: Burner Will Not Fire

Troubleshooting: Burner Will Not Shut Down

Troubleshooting: Low Water Light Status

Troubleshooting: Overheating Indication

Troubleshooting Flow Chart: Burner Will Not Fire

Troubleshooting Flow Chart: Burner Will Not Shut Down

Electro-Well™ Models

HydroStat with Electro-Well™ Installation

Specifications