Electro Industries Mini-Boiler EMB-S-1, Installation & Operating Instructions Manual, Page: 4 / 20

03/12/2019
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BI309
pushed down this PVC conduit. If the slab is already poured without conduit for slab stat, use electronic
remote sensing thermostat.

Quick response, hydronic tubing just under the concrete surface, no flooring material over the
concrete
– slab stat is still suggested and preferred, but a standard wall mount room thermostat can be
adequate. Mount room thermostat on an inside wall similar to most heating systems.
SAFETY TEMPERATURE CONTROL
The hi-limits within this unit are for safety purposes only. The system installation must have a proper
responding slab sensing thermostat or zone controlling device to properly turn the boiler on and off. If the water
flow is greater than the nominal GPM specified, this boiler should not reach hi-limit and the hydronic loop
should continue to flow in the normal heating pattern until the operating slab stat is satisfied. If hi-limiting is
experienced prior to satisfying the operating slab stat, there is probably a water flow issue.
In addition to the built-in supply sensing point and electronic operating temperature control point, there is a 190°
F automatic reset hi-limit and a 205° F top vessel manual reset hi-limit.
INFORMATION/WATER FLOW CALCULATIONS
Water flow, GPM, can easily be calculated if the temperature rise across the electric boiler can be measured.
The formula below can only be used when the temperature rise is stable and the boiler is not hi-limiting. In
other words, verify constant current draw and stable outlet temperatures for at least 15 minutes.
GPM=
Volts x Amps x 3.4
Example:
240 volts x 36 amps x 3.4
=
29376
= 5.8 gpm
500 x Temp. rise 500 x 10 degree rise 5000
INFORMATION/WATER FLOW CALCULATIONS – METRIC
L/min =
Volts x Amps x 3.587
Example:
240 volts x 36 amps x 3.587
=
30991.68
= 20.57 L/min
251.04 x Temp. rise ° C 251.04 x 6° C rise 1506.24
INSTALLATION REQUIREMENTS
1. All installation work must be performed by trained, qualified contractors or technicians. Electro Industries,
Inc., sponsors installation and service schools to assist the installer.
Visit our web site at electromn.com
for upcoming service schools.
WARNING
ALL ELECTRICAL WIRING MUST BE IN ACCORDANCE WITH NATIONAL ELECTRIC CODE AND
LOCAL ELECTRIC CODES, ORDINANCES, AND REGULATIONS.
WARNING
OBSERVE ELECTRIC POLARITY AND WIRING COLORS. FAILURE TO OBSERVE COULD CAUSE
ELECTRIC SHOCK AND/OR DAMAGE TO THE EQUIPMENT.
CAUTION
This unit can only be used for its intended design as described in this manual. Any internal wiring changes,
modifications to the circuit board, modifications or bypass of any controls, or installation practices not
according to the details of this manual will void the product warranty, the ETL/Intertek certification, and
manufacturer product liability. Electro Industries, Inc., cannot be held responsible for field modifications,
incorrect installations, and conditions which may bypass or compromise the built-in safety features and
controls.
2. This installation manual and Mini-Boiler products relate only to the addition of the Mini-Boiler to the
hydronic system. The owner/ installer assumes all responsibility and/or liability associated with any needed
installation of the gas/oil boiler, pump, plumbing, system design, hydronic systems or backup gas/oil boiler,