Hydrolevel 3100 User Manual

MODEL 3100

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

PATENTS PENDING

• Dual Function Design – HydroStat performs both high temperature limit and low

water cut-off functions when installed with a Hydrolevel Electro-Well™.

Replaces Common Aquastat

•

wells to replace both cold-start and triple-action Aquastats

*

odels – Can be installed on existing immersion

M

®

. Industry standard

wiring designations make change-outs quick and easy.

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

isplays temperature limit and differential settings during adjustment.

d

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

complicated programming.

Advanced Micro-Controller Design – Utilizes dual thermistor technology for

•

better accuracy, response and reliability.

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

•

Electrical shock hazard. To prevent electrical shock, death or

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.

quipment damage, disconnect power supply before

e

HydroStat installed
with Electro-Well™

When installed with the Hydrolevel Electro-Well,
HydroStat will provide
cut-off functionality. If the control was supplied by the
boiler manufacturer, it was installed with an Electro­Well. The Electro-Well is available separately for field
installations. See Electro-Well models on page 8.

both

temperature and low water

/2" CLEARANCE

1

/2" CLEARANCE

1

To prevent serious

CAUTION

should be thoroughly cooled before installing or
servicing control.

urns, boiler

b

IIMMPPOORRTTAANNTT::

For proper opera­tion of the low
water cut-off func­tion, there must
be a minimum of
½" clearance
between the cop-

1/2" CLEARANCE

per well tube and
any surface within
the boiler.

OR

HydroStat installed with
a standard immersion well

For field replacement of common Aquastat®models,
HydroStat can be installed with the immersion well
already on the boiler. In this configuration, HydroStat
will provide the temperature functionality of the control
being replaced, but will not provide low water cut-off
functionality. The “LWCO Active” LED will not illuminate.

IMPORTANT When installed on a standard immersion well, HydroStat will not provide low water cut-off functionality.

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

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MOUNTING THE CONTROL

IMPORTANT Make sure that the immersion well or Electro-Well™ is installed on the boiler manufacturerʼs

designated temperature limit control tapping. Note: If installing an Electro-Well, pipe sealing compound should be
used. Teflon tape is not recommended.

STEP 1

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

he knockout.

t

FIG. 1

Two mounting positions are available on the

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)

FIG. 3

FIG. 2

NOTE: In the case of space restrictions, the 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

The following kits are available separately for mounting
the HydroStat control box in a remote location. Each kit
includes mounting hardware and a remote sensor.

Part No. Description

48-101 Wall/Jacket Mounting Kit with 2' sensor cord

48-102 Wall/Jacket Mounting Kit with 4' sensor cord

48-103 Wall/Jacket Mounting Kit with 10' sensor cord

48-104 Wall/Jacket Mounting Kit with 20' sensor cord

48-121 Pipe Mounting Kit with 4' sensor cord

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WIRING

WARNING

STEP 1

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

Connect 120 VAC Hot

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

STEP 4 Connect wires from Low

Voltage Thermostat to T and TV.

STEP 2 Connect the circulator to

C1 and C2 (C2 is neutral).

STEP 5 If the boiler is equipped

with a plug-in style vent damper,
unplug the factory installed jumper
from the receptacle on the circuit board
and replace it with the vent damper
plug. NOTE: Once a vent damper plug
is connected to the HydroStat, the con­trol is permanently altered and will no
longer function when the vent damper
plug is disconnected.

STEP 3 Connect wire from 24

VAC Burner Circuit to B1(quick con­nect). Connect wire from 24 VAC
Burner Circuit common to B2 (fork).

ZONE VALVE WIRING

MPORTANT: Use a separate transformer to

I

power zone valves. Connecting zone valves to
Z-TV may overload the HydroStat and cause a
lock-out condition (see
for more information). The total load, including the
burner circuit, vent damper, and Z-TV connections
must not exceed 1.2 amps (30 VA). Connect zone
valve end-switch to T-TV as shown below.

Troubleshooting

on page 6

SCHEMATIC/LADDER DIAGRAM

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