Hydrolevel 3150 User Manual

MODEL 3150

INSTALLATION INSTRUCTIONS
and OPERATING MANUAL

Combination Low Water
Cut-Off & Universal
Temperature Limit Control
for Oil-Fired Boilers

PATENT NO. 7,891,572

Dual Function
Design

Temperature Limit Control

Designed for cold start and tankless
coil boilers.

• Replaces Common Aquastat*Models – Can be installed on existing immersion

wells to replace both cold-start and triple-action Aquastats
designations make change-outs quick and easy.

• Digital Display – Easy to read LED continually displays boiler temperature. Also displays

temperature limit and differential settings during adjustment.

• Easy to Set – Dials for setting temperature limits and differentials eliminate complicated

programming.

• Thermal Pre-Purge Feature – Conserves fuel and meets 2012 DOE regulations by

circulating latent heat in the boiler to the heating zone before firing the burner.

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

®

. Industry standard wiring

Low Water Cut-Off

Provides protection against potentially
dangerous low water conditions
when installed with the Hydrolevel
Electro-Well™ (see page 2 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.

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

CAUTION

should be thoroughly cooled before installing or
servicing control.

To prevent serious
burns, boiler

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

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 11.

When installing on a standard immersion well, the LWCO function should
be turned off (see page 6 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 installing an Electro-Well, pipe sealing compound should be used. Tef

lon 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.

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.

Two mounting positions

BACK OF

HYDROSTAT BOX

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

terminal L1. Connect 120 VAC Neutral
to terminal L2. Disconnect means and
overload protection as required (pro­vided by others).

Connect 120 VAC Hot to

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

STEP 2 Connect the circulator to

C1 and C2. (C2 is neutral.)

STEP 3 Connect the burner cir-

cuit to B1 and B2. (B2 is neutral.)

STEP 4 Connect the thermostat to

T and T.

SCHEMATIC/LADDER DIAGRAM

Multi-Zones Adding additional zones.

3

SETTING THE CONTROL

Dynamic

Display

Water Temperature

and Real Time

Verification of

Setting Adjustments.

Low Temperature

Limit Setting

(OFF or 110°-200°F)

Factory OFF

Low Temperature

Differential Setting

(10°-30°F)

Factory 10°F

NOTE: Be careful not to select overlapping temperature settings.
For example: If the HIGH TEMPERATURE LIMIT is set at
190°F with a HIGH TEMPERATURE DIFFERENTIAL set at 20°F,
then the LOW TEMPERATURE LIMIT needs to be set at 170°F
(190°F - 20°F = 170°F) or below.

IMPORTANT: To prevent flue gas condensation and reduce
fatigue caused by thermal cycling on conventional (non-condens­ing) boilers, both HIGH and LOW LIMIT set points should be
150°F or above (Limit Setting - Differential Setting ≥ 150°F).
Boiler manufacturerʼs temperature requirements supercede these
recommendations.









Diagnostic LEDs

Test/Settings Button

Jumper

High Temperature
Limit Setting
(100°-220°F)

Factory 190°F

High Temperature
Differential Setting
(10°-30°F)

Factory 10°F

To set COLD START operation

Operates on call for heat only.



Low Temperature Limit

Make sure Low Temperature Limit is turned fully
counter-clockwise (OFF position).



Low Temperature Differential

No change is required.



High Temperature Limit

(factory setting = 190°F)
Adjust setting until desired temperature is dis­played.



High Temperature Differential

(factory setting = 10°F)
Using a small screwdriver, adjust setting until
desired differential is displayed.

To set WARM START operation

Maintains temperature for domestic hot water.



Low Temperature Limit

Adjust setting until desired temperature is dis­played. Prior to adjusting, remove the jumper
located at the top right corner of the circuit board
(not equipped on all units).

IMPORTANT: If low limit temperature cannot
be set above 140°F, remove jumper.



Low Temperature Differential

Using a small screwdriver, adjust setting until
desired differential is displayed.



High Temperature Limit

(factory setting = 190°F)
Adjust setting until desired temperature is dis­played.



High Temperature Differential

(factory setting = 10°F)
Using a small screwdriver, adjust setting until
desired differential is displayed.

OPERATION

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