Hydrolevel 3250-Plus User Manual

MODEL 3250-Plus

INSTALLATION INSTRUCTIONS
and OPERATING MANUAL

Temp Limit / LWCO Control
with Thermal Targeting

™

for Water Boilers

120 VAC Operating Voltage

PATENT NO. 7,891,572

• Saves Fuel – Features Thermal Targeting™ technology and

• Outdoor Reset Ready – Provides Outdoor Reset and Warm Weather

• Universal Design – Replaces common cold-start and triple-action

• Operating Indicators – LEDs, Dynamic Display and Test Button provide

• Prioritizes Domestic Hot Water – Gives priority to low limit setting or to

• Reduces Condensation – Holds circulator off until boiler reaches 125°F

•

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).

Thermal Pre-Purge capability

Shut-Down capability with the addition of Hydrolevel OS-100 Outdoor
Sensor Kit (sold separately)

Aquastats*

continual and on-demand status checks

calls from indirect water heater

*Aquastat is a registered trademark of Honeywell International, Inc.

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

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

is recommended for unattended dwellings in climates subject to sustain below-freezing temperatures.

Electrical shock hazard. To prevent electrical shock, death or
equipment damage, disconnect power supply before

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

83 Water Street • New Haven, CT 06511 • Phone [phone] • FAX [phone] • www.hydrolevel.com

CAUTION

should be thoroughly cooled before installing or
servicing control.

To prevent serious
burns, boiler

1

IMMERSION WELLS

Fuel Smart HydroStat can be installed on a Hydrolevel Electro-Well™ or on an existing immersion well already in the boiler.

IMPORTANT: The control will only provide low water cut-off protection when installed on an Electro-Well™.

Installing HydroStat

with Hydrolevel Electro-Well™

When installed on an Electro-Well™ (sold separately), the Low Water Cut-Off
function is automatically activated. Heat transfer grease should not be used.
NOTE: For proper operation, there must be 1/2" clearance between the cop­per well tube and any furnace within the boiler.

See Electro-Well™ models on page 15.

When installing on a standard immersion well, the LWCO function should
be turned off (see page 10 for instructions). A buildup of heat transfer

grease or other coatings in older wells can interfere with continuity between
the sensor and the well causing a false low water shutdown. Turning off the
LWCO function will prevent this from occurring.

Installing HydroStat

with Standard Immersion Well

MOUNTING THE CONTROL

IMPORTANT Make sure that the immersion well or Electro-Well™ is installed in the boiler manufacturer’s designated

temperature limit control tapping.

NNOOTTEE::

If i

nstalling an Electro-Well™, pipe sealing compound should be used. Teflon tape is not recommended.

STEP 1

are available on the back of the control
(Fig. 1). Select which of the two positions
(2 knockouts) is best for the location of
the control. Remove the knockout.

FUEL SMART HYDROSTAT BOX

FIG. 1 FIG. 3FIG. 2

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.

REMOTE MOUNTING KITS are available separately for mounting the Fuel Smart HydroStat control box in a remote location.

Each kit includes mounting hardware and a remote sensor. See page 16 for kit options.

Two mounting positions

BACK OF

STEP 2 Place control on the well.

While holding box against well nut,
tighten well clamp screw. (Fig. 2)

STEP 3 Insert sensor ALL THE

WAY into well through the knockout (A
or B) you have chosen. (Fig. 3)

2

WIRING

WARNING

STEP 1 Connect 120 VAC Hot to terminal L1. Connect

120 VAC Neutral to terminal L2. Disconnect means and
overload protection as required (provided by others).

Electrical shock hazard. To prevent electrical shock, death or equipment damage, disconnect power supply before
installing or servicing this control.

STEP 2 Connect the burner circuit to B1-B2.

(B2 is neutral.)

Select the Diagram that

Matches your System Configuration

on Pages 4, 5 or 6

3

WIRING

WARNING

NOTE: For proper operation of the boiler reset function, all heating thermostats must input to T-T or ZC-ZR terminals as indicated below.

Electrical shock hazard. To prevent electrical shock, death or equipment damage, disconnect power supply before
installing or servicing this control.

Jumping the T-T terminals and wiring the thermostat to the primary will override the economy feature.

STEP 3A: HEATING ONLY – No Indirect Water Heater

CHOOSEORBELOW

SINGLE CIRCULATOR MULTIPLE CIRCULATORS



Connect thermostat or end switch from zone relay or multi­zone panel to T-T. Connect circulator to C2-C1. Move
Zone/Indirect Switch up to Z.

ZONE/
INDIRECT
SWITCH
POSITION

ZONE/
INDIRECT
SWITCH
POSITION

Connect end switch from circulator relay or multi-zone panel to
ZC-ZR. Move Zone/Indirect Switch up to Z.

STEP 3B: HEATING and Indirect Water Heater

IMPORTANT:

bypass the Thermal Targeting feature and allow the boiler to fire to the high limit setting to heat the indirect tank. The indirect signal must be separate from all
heating zone signals. If you choose not to separate the indirect signal from the heating zones, the Economy Feature should be turned OFF to ensure that the
boiler supplies adequate temperature to heat the indirect tank (see page 7).



Connect thermostat or end switch from zone relay or multi-zone
panel to T-T. Connect circulator to C2-C1. Connect end switch
from indirect zone relay to ZC-ZR. Move
down to I.

When installing with an indirect water heater, the Zone/Indirect Switch must be set in the I position. When set in the I position, calls to ZC-ZR will

CHOOSE FROM



THROUGHBELOW OR ON PAGE 5 OR 6

SINGLE CIRCULATOR MULTIPLE CIRCULATORS

Zone/Indirect

ZONE/
INDIRECT
SWITCH
POSITION

Switch

Connect end switch from heating circulator relays or multi-zone
panel to T-T. Connect end switch from indirect circulator relay to
ZC-ZR. Move Zone/Indirect Switch to I.

ZONE/
INDIRECT
SWITCH
POSITION

4

WIRING

WARNING

NOTE: For proper operation of the boiler reset function, all heating thermostats must input to T-T or ZC-ZR terminals as indicated below.

Electrical shock hazard. To prevent electrical shock, death or equipment damage, disconnect power supply before
installing or servicing this control.

Jumping the T-T terminals and wiring the thermostat to the primary will override the economy feature.

STEP 3B: HEATING and Indirect Water Heater – continued

MULTIPLE CIRCULATORS — Typical Zone Panel with Priority Zone



ZONE/
INDIRECT
SWITCH
POSITION

NOTE: The wire from ZR to the hot terminal of the indirect circulator will ensure
that indirect calls will fire to limit and receive priority over heating calls.

SINGLE CIRCULATOR — Multiple Zone Valves including Indirect, No Zone Control Panel



NOTE: When using zone valves for both heat and indirect, the calls must be separated in order to prioritize indirect calls. This can
be accomplished by using a general purpose relay as shown above. However, for ease of installation, a zone control panel is rec­ommended (see wiring diagram 7 on next page).

ZONE/
INDIRECT
SWITCH
POSITION

MORE

5