10/22/2008
2
BI302B
TEMPERATURE CONTROL
The hi-limits within this unit are for safety purposes only. The system installation must have a proper responding slab
sensing thermostat to properly turn the boiler on and off. If the water flow is greater than the minimum GPM specified,
this boiler should not reach hi-limit and the hydronics 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 problem.
The WarmFlo
®
aquastat sensor is designed to control the temperature at the set point; however, depending upon the sensor
location, water flow through the pipe at the sensor well, and the non-failure of the circuit board; the temperature of this unit
should never reach hi-limit (160°). The limits are provided as a safety backup to the WarmFlo
®
modulator.
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.
Volts x Amps x 3.4
240 volts x 36 amps x 3.4
29376
GPM=
500 x Temp. rise
Example:
500 x 10 degree rise
=
5000
= 5.8
gpm
INFORMATION/WATER FLOW CALCULATIONS – METRIC
Volts x Amps x 3.587
240 volts x 36 amps x 3.587
30991.68
L/min =
251.04 x Temp. rise ° C
Example:
251.04 x 6° C rise
=
1506.24
= 20.57
L/min
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 CSA/us certification label, 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 Electro-Boiler products relate only to the addition of the Electro-Boiler to the hydronics
system. The owner/installer assumes all responsibility and/or liability associated with any needed installation of the
gas/oil boiler, pump, plumbing, system design, etc. Any instructions or comments made within this manual (or factory
phone assistance) relating to the hydronics system or backup gas/oil boiler are provided as comments of assistance and
“helps” only.
