Hamworthy QAA73.210, Installation, Commissioning And Servicing Instructions

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HAMWORTHY HEATING LTD QAA73.210
Programmable Room Unit
500001305/B
13
7.0 Single Heating Zone Installations
Description of system type
All heating circuit pumps and temperature control is
achieved via the boiler with the QAA73 room
controller. Time clock and climate settings are
programmed within the QAA73 room controller as
part of the commissioning procedure.
Hardware required
1 Boiler incorporating LMU64 boiler
management unit.
2 Room programmer QAA73. Programmable
room unit kit including wiring terminal blocks
for boiler LMU wiring connection, part number
563605337.
3 External air sensor QAC34. Part number
533901457.
Frost protection
The building is protected for internal temperature
using the QAA73 room programmer temperature
sensor.
The boiler is internally protected for water
temperature using the LMU64 temperature sensors.
Heating pump
The heating pump is designated Q1. This must be
connected to the boiler at terminals ‘ X2 - 02, Q1
heating circuit pump contactor ’.
Flow rate and resistance for the heating pump must
be sized in accordance with the flow requirements
for the boiler and the resistance requirements of
both the boiler and the heating circuit.
Note: The control does not incorporate a facility for
switching duty/standby pumps. If required this must
be facilitated externally to these controls.
Room programmer
The single room programmer, QAA73, must be
installed in the location most suitable for providing
accurate space heating comfort control with the first
heating circuit area (circuit using pump Q1). This
must be connected to the boiler at terminals ‘ X10 -
01, room unit QAA73 ’.
Wiring should be completed using a 1.5mm² twisted
pair shielded cable run separately to any mains
cables to prevent electrical interference.
External air sensor
This must be installed on a North facing wall to
prevent solar heating of the sensor and away from
heat emitting items such as ventilation outlets.
Connection is directly to the boiler at terminals ‘ X10 -
06, external air sensor QAC34 ’. Wiring should be
completed using a 1.5mm² twisted pair shielded
cable, run separately to any mains cables to prevent
electrical interference. For further details regarding
the sensor specification and fitting requirements
refer to appendix A at the rear of this manaul.
Features available with this system
•
7 Day time clock with 4 periods each day
•
Auto summer/winter time change (BST to
GMT)
•
Holiday program
•
Frost protection for building
•
Reduced temperature (night setback)
•
Weather compensation
•
Summer shutdown
•
Fault diagnostics with error code indication
•
Programmable lock to prevent tampering after
commissioning