BOILER DEMAND PUMP (P7) OPERATION
• The boiler demand pump (Boil Dem Pmp P7) contact
(terminals 9 and 10) closes if there is a boiler demand and the
control is not in WWSD
• After boiler demand is removed, the boiler system pump
runs an additional 20 seconds
NOTE: Boiler demand can be an external demand
or a boiler zone control as described in section B2.
EXTERNAL BOILER DEMAND
External boiler demand is generated by applying a voltage
between 24 and 240 VAC across Boil Dem (3) and Com Dem
(4) terminals.
• Once voltage is applied, Boiler Demand pointer is displayed
in the LCD
• If control is not in WWSD, it closes the Boil P3 contact, which
starts the primary pump and closes the Boil Dem Pmp P7
contact, which starts the boiler system pump
• The control turns on the primary pump and boiler system
pump segments in the LCD
• The control calculates a Boil TRG supply temperature, then
fires the boiler (if required) to reach and/or maintain target
supply temperature
BOILER ZONE CONTROL
A tekmar zone control can be used to control the temperature
in the boiler zones connected to the boiler demand pump (P7).
• Connects to SYSTEMpro 311 using Boil ZoIn terminal and
Com terminal (24 and 25)
• Provides its own internal boiler demand to SYSTEMpro 311
NOTE: In this case, there is no need
to provide external boiler demand.
• Can adjust the Boil TRG temperature (if required) to provide
improved building occupant comfort and system performance
Section B2: Boiler Demands
62
CONTROL FUNCTION
OVERVIEW
CONTROL FUNCTION OVERVIEW - CONTROL FUNCTION OVERVIEW - Section B - Boiler / High Temp Zones
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