Hydrolevel 3250 User Manual

MODEL 3250

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

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

• Easy to Install – Industry standard wiring, dial-type settings,

• 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 120°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).

hermal Pre-Purge capability

T

quastats*

A

o external sensors necessary

n

continual and on-demand status checks

calls from indirect water heater

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

Boiler Reset Control

Utilizes
technology to conserve fuel by
monitoring heating demand and
establishing target boiler temperatures
below the high limit setting (see page 7
for details).

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.

Thermal Targeting

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

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 an existing immersion well already in the boiler or on a Hydrolevel Electro-Well™
(sold separately). The low water cut-off function is automatically activated when installed on an Electro-Well™.

IMPORTANT: The control will not provide low water cut-off protection when installed on a standard immersion well.
NOTE: Do not use heat-conducting grease.

Fuel Smart HydroStat installed

with Hydrolevel Electro-Well™

IMPORTANT: For proper operation of the low water cut-off function, there
must be a minimum of ½" clearance between the copper well tube and any
surface within the boiler.

See Electro-Well models on page 12.

NOTE: When installed on a standard immersion well, the “LWCO Active”
LED will not illuminate.

Fuel Smart HydroStat installed

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 installing 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.

Two mounting positions

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)

BACK OF

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 12 for kit options.

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.

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

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



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.

ONE/

Z
INDIRECT
SWITCH

OSITION

P

ONE/

Z
INDIRECT
SWITCH

OSITION

P

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