Hamworthy QAA73.210, Installation, Commissioning And Servicing Instructions

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HAMWORTHY HEATING LTD QAA73.210
Programmable Room Unit
500001305/B
30
9.0 Twin Heating Circuits with Domestic Hot
Water
Description of system type
All 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.
The boiler controller, LMU64, will set the primary
temperature according to the highest heat
requirement, ie, if the D.H.W. cylinder requires a
higher temperature than the heating circuits the
primary temperature will be set to this. During this
period the heating circuit pumps will be switched off
to prevent overheating of the space.
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.
4. D.H.W. Cylinder sensor QAL36. Sensor kit
including wiring terminal blocks for boiler LMU
wiring connection and immersion pocket, part
number 563605338.
5. Second heating circuit clip - in relay
AGU2.500A109. Relay kit including wiring
terminal blocks for boiler LMU wiring
connection, zone water temperature sensor
QAL36 and immersion pocket, part number
563605339.
Fitting second heating circuit clip in relay kit
AGU2.500A109
The clip - in relay is required to provide an output
signal to enable the second heating circuit pump.
This clip - in relay must be fitted to the boiler control
unit LMU64. In the open space alongside the
standard relay the new clip - in must be firmly pushed
into its mounting position.
Connect the clip - in relay using the ribbon cable
supplied to terminal connection X40 at the boiler
LMU64 controller.
Power for the clip - in relay is supplied via the existing
clip - in relay to the left of the second heating circuit
clip - in relay. Using the 2 core cable supplied with
the kit connect terminal block X52 - 01 of the second
heating circuit relay to terminal block X52 - 01 of the
existing relay. Ensure the Live supply is connected
to terminal 1 and Neutral to terminal 2.
Wiring output to pump contactor (not supplied) from
terminals 1 & 2 (L & N) block X52 - 02 of the clip - in
relay.
Wiring output to the mixing valve (not supplied) from
terminals 1,2&3 block X52 - 03 of the clip - in relay.
Frost protection
The building is protected for internal temperature
using the QAA73 room programmer temperature
Connect the flow sensor, QAL36, supplied with the
kit, using a twisted pair shielded cable, to terminals
X51 - 01 on the second heating circuit clip - in relay.