Building Management System (Bms) - Lochinvar ECOKNIGHT EKW116CE Installation, Commissioning, Maintenance And User Instructions

BUILDING MANAGEMENT SYSTEM (BMS)

16.3.1
GENERAL SCHEME OF CONTROL
The EcoKnight water heater has various control options when connected to a BMS, many of these options are available as the
control is also used by a Boiler version and are unsuitable for use with the EcoKnight water heater. Lochinvar recommend leaving
the water heater to operate based on the temperature within the storage vessel monitored from its own sensor (included with each
water heater). This will activate the water heater and shunt pump on demand (utilising the built in Cascade control if there is more
than one water heater), when demand is satisfied the water heater will activate the pump overrun to clear any excess heat from the
heat exchanger prior to shutting down the unit. When operating this way the BMS can still pick-up a fault or run signal. See drawing
here.
If there is a requirement to turn the water heater 0n/off via a BMS then this scheme must be approved by Lochinvar prior to installation.
The BMS can turn the water heater on/off but must not be used to activate the associated shunt pump that must be controlled by the
water heater to allow a suitable pump overrun. See drawing here for a typical scheme. If there are multiple water heaters installed
the BMS should only turn on the lead appliance which will decide on the number and modulation of burners to fire depending upon
demand. In all cases the EcoKnight water heater must have the supplied temperature sensor fitted within the storage vessel.
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