HAMWORTHY HEATING LTD 4
Merley Boiler Sequence Controller 500001210/D
Hamworthy offer a pre-assembled wall mounted panel version incorporating the sequence control and user
display, mounted in a robust painted steel cabinet, complete with lockable hinged door, mounting brackets, DIN
rail, cable trunking and cable glands.
Alternatively, the Merley is suitable for incorporating into a local control panel (not HHL supply), requiring a Din rail
to mount the plc logic control and a cutout in the panel door to accommodate the user display screen.
Boiler
• Optimum start control with minimum limitation of
the boiler temperature
• Minimum and maximum limitation of the boiler
temperature
• Protective boiler startup
• Protection against boiler over temperatures
(pump overrun)
• Burner cycling protection by observing a
minimum burner running time
• Frost protection boiler
Heating Circuit Control
• Pure weather compensation
• Weather compensation with room influence
• Pure room temperature compensation
• 1st mixing / pump heating circuit with 7-day
program
• The building’s thermal dynamics are taken into
consideration (building time constant)
• Automatic adaptation of heating curve
• Automatic summer / winter changeover
• Automatic 24-hour heating limit
• Holiday program
• Quick setback and boost heating
• Optimum start / stop control
• Raising the reduced temperature level
depending on the outside temperature
• Frost protection flow, building and plant
• Primary controller
DHW Control
• DHW storage tank charging with 7-day program
• DHW charging with charging pump or diverting
valve
• DHW charging with sensor
• DHW charging with a thermostat
• Selectable priority (absolute / shifting / none)
• Selectable DHW program (according to DHW
program, according to heating programs, 24
hours)
• DHW push, manually or automatically
• Legionella function
• DHW discharging protection
• Control of DHW circulating pump
• electric immersion heater for DHW
• Overtemperature protection DHW storage tank
• Frost protection DHW
General
• Automatic summertime/wintertime changeover
• Automatic identification of sensors
• Input and output test
• Service and error messages
• Status display for partial plant diagram
• Parameter reset
• Read/write parameters with operator units
• Multifunctional inputs and outputs
• Connection facility radio receiver
• Connection facility service tool (via OCI700)
• Connection facility for remote monitoring (via
OCI611)
1.0 General Overview:
1.1 Merley Boiler Sequence Controller
Brief Description
Controls up to 16 boilers using Siemens LMU controls. May be independently enabled by a 0-10v signal from a
BMS or start/stop signal from a time clock. It also has a built in clock & uses an LPB Bus to communicate with the
boilers. Each boiler control requires an extra module to communicate with the cascade controller. Operating from
a BMS temperature signal or with the dedicated flow temperature sensor, cascade systems can be designed to
operate up to 90°C. Dependant on application the control can offer additional features as detailed below.
Note: the control offers system functionality which is not detailed in this manual. For more complex systems
refer to HHL Technical.
