3
ZZ829/3
ZZ829/3
6
6.2
With the timer (if fitted) set to an ‘
OFF
’ position, and the Thermista-stat at a setting which does not call for heat, switch
the electrical supply ON, and set the ‘SUMMER AIR CIRCULATION’ switch to ‘
I
’ and ensure that the fan operates.
6.3
Adjust the ducting system grilles and dampers to provide the required design velocity balance.
6.4
Open the isolation valves (external to the appliance) and the lockshield valve to allow water into the heat exchanger, Set the
‘SUMMER AIR CIRCULATION’ switch to ‘
O
’ and ensure that the fan stops.
6.5
With the water system operating at the design temperature set the timer (if fitted) to an ON position, set the Thermista-stat
to call for heat. Ensure that the motorised three port valve opens allowing water to flow through the heat exchanger, and
after a short delay that the fan starts.
6.6
Set the lockshield valve to provide a 10
O
C temperature differential between the flow and return. The heat exchanger is
based upon a flow temperature of 80
O
C and a return temperature of 70
O
C.
6.7
Allow the system to warm up, and then check that the return air temperature differential at the registers is approximately
40
O
C.
6.8
Test the operation of the Thermista-stat and the timer (if fitted) by setting them to an OFF position. Ensure that the three
port valve changes over to ‘bypass’ allowing the heat exchanger to cool, followed by the fan switching off after
approximately 3 minutes. ( The fan control turns the fan on when the water temperature reaches 70
O
C, and off at 60
O
C.)
6.9
Operate the ‘SUMMER AIR CIRCULATION SWITCH’ with the system running, and ensure that the three port valve
changes over to ‘bypass’ and that the fan continues to run.
6.10
Set the Thermista-stat, and timer (if fitted) to the user’s requirements.
7.
INSTRUCTIONS TO USER
7.1
Leave these instructions with the user for use on future service visits, and ensure that the user is aware of the following:
7.1.1
The importance of regular cleaning of the filter, at least once every month.
7.1.2
How to control the heating system by opening and closing the warm air vents.
7.1.3
That the warm air outlets in the rooms served by the heater MUST NOT BE BLOCKED.
7.1.4
That the return air inlet must not be obstructed.
7.1.5
How to obtain Summer Air Circulation.
8.
MAINTENANCE
8.1
ROUTINE MAINTENANCE:
IMPORTANT:
Before carrying out any work on the unit, ALWAYS ENSURE THAT IT IS ISOLATED
FROM THE MAINS ELECTRICAL SUPPLY
. Remove the front cover of the unit by gently pulling it forward to
release the two spring clips. Maintenance should carried out at least once per year.
8.1.1
Check that the heat exchanger airways are free from obstructions. If necessary, clean with a vacuum cleaner from
the air inlet end of the unit, taking care to not damage the airways.
CAUTION: THE ELEMENTS OF THE HEAT EXCHANGER ARE VERY FRAGILE.
8.1.2
Check the condition of the strainer, cleaning as necessary.
8.1.3
Check that the air filter is being regularly cleaned in accordance with the User’s Instructions.
8.2
ELECTRICAL PANEL FUSE REPLACEMENT:
8.2.1
Ensure that the electrical supply is switched off and isolated.
8.2.2
Release the 2 x retaining screws and withdraw the panel containing the ‘SUMMER AIR CIRCULATION’ switch,
disconnect the flying terminal strip and remove the panel from the unit.
8.2.3
Two fuses are mounted in fuse holders at the right hand end of the panel. Fuses are only to be replaced with ANTI-
SURGE fuses of the correct value.
8.3
ELECTRICAL PANEL REMOVAL:
8.3.1
Ensure that the electrical supply is switched off and isolated.
8.3.2
Release the 2 x retaining screws and withdraw the panel containing the ‘SUMMER AIR CIRCULATION’ switch,
disconnect the flying terminal strip and remove the panel from the unit.
8.3.3
Disconnect the wiring to the water valve and time control (if fitted) at the electrical panel terminal block.
8.3.4
Release the 4 screws securing the electrical panel and withdraw the panel, disconnecting the fan supply lead at the
fan tray terminal block.
8.3.5
Reassembly or replacement is in reverse order.
Fig. 2
AQUAIR 80 UNIVERSAL CIRCUIT DIAGRAM