tekmar 284 Boiler Control - Manual (Page 6)

© 2014 284_D - 08/14 6 of 60 A Watts Water Technologies Company
Flow Monitoring ---------------------------------- ----------------------------------
The control has the capability to monitor flow rate through the
connection of a 4-20 mA style flow sensor. Flow is measured in
either gallons per minute (gpm) or meters cubed per hour (m
3 /h).
The units are adjustable through the FLOW UNIT setting in the
Toolbox menu.
Varying flow rates are accommodated & the flow range of the
flow sensor being used is configured using the following items
in the Setup menu:
FLOW RATE 4 mA
Sets the flow rate on the low end which corresponds to
4 mA.
FLOW RATE 20 mA
Sets the flow rate on the high end which corresponds to
20mA.
Examples of compatible aftermarket flow sensors include the
Kele SDI series, 2200 & 3100 series and 200 series (requires
310 transmitter).
In addition to flow monitoring, the flow sensor can also be
used to prove primary pump flow. Refer to the Pump Operation
section of this brochure for additional details.
Energy Monitoring ------------------------------- -------------------------------
The control has the capability to monitor Energy. The control
requires the boiler supply, boiler return sensor & the flow
sensor in order to calculate & display energy in either Therms
(THRM) or Gigajoules (GJ). The units are adjustable through
the ENERGY UNIT setting in the Toolbox menu. Select MBtu
for display in THRM and kWh for display in GJ.
Pressure Monitoring ----------------------------- -----------------------------
The control has the capability to monitor system pressure
through the connection of a V(dc) style pressure sensor with a
signal range of 0.5 to 4.5 V (dc). Pressure is measured in either
psi or kPa. The units are adjustable through the PRESSURE
UNIT setting in the Toolbox menu.
The Pressure Sensor Range item in the Setup menu selects
from the available pressure ranges for the pressure sensor
to be used.
Examples of compatible aftermarket pressure sensors
include the Honeywell PX2 (AA) series and the Measurement
Specialties 7100 series.
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Vent Temperature Monitoring & Limiting --------- ---------
The control has the capability to measure & limit the vent
temperature. The VENT MAX setting defines the operation
of the vent sensor. If the vent temperature exceeds the VENT
MAX, the boiler plant is shut down. The boiler plan will not be
allowed to operate until the vent temperature drops 10°F (6°C)
below the VENT MAX. If OFF is selected, the vent temperature
is only monitored.
Alert Relay --------------------------------------- ---------------------------------------
The control has an Alert relay that closes whenever a control
or sensor error is detected, or when a warning or limiting
condition is detected. When the alert contact closes, refer to
the Error Messages section of this brochure to determine the
cause of the alert & how to clear the error.
Boiler Alert
If no temperature increase is detected at the boiler supply sensor
within this delay period, the Alert relay will close & the control
will display the NO HEAT error message. To clear the error,
press the CLEAR button while viewing the error message.