Armstrong 3750 Manuale di installazione e istruzioni per l'uso - Pagina 7
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3 All incoming cable glands should be ip54 rated as a
minimum.
4 Wire the set control systems (see enclosed wiring
diagram) from the volt free terminals to the boiler control
system.
5 Boiler/chiller interlock provided via normally open volt
free contact.
6 The set must be efficiently earthed.
attention
It is the user's or certified electrician's responsibil-
ity to ensure correct earthing and protection in
accordance with applicable national and local
requirements and standards.
important safety information
1 The voltage on the 3750 Pulpress unit is dangerous when
it is connected to the mains. Incorrect installation of the
set may lead to material damage or serious injury or
death. Consequently, you must comply with the
instructions in this manual as well as the local rules and
safety regulations.
2 Touching the electrical parts may be fatal, even after
the mains supply has been disconnected, wait at least
4 minutes.
3 The installation must be fused and isolated correctly.
4 Covers and cable entries must be fitted.
14 .0 safety regulations
1 The 3750 Pulpress unit must be disconnected from the
mains if repair work is to be carried out. Check the mains
supply has been disconnected and the necessary time has
passed (4 minutes).
2 The correct protective earthing of the equipment must
be established, the user must be protected against supply
voltage, and the set must be protected against overload in
accordance with applicable national and local regulations.
3 RCDs (elcb relays), multiple protective earthing or
earthing can be used as extra protection, provided that
local safety regulations are complied with.
15 .0 commissioning
1 Fill the system with water via the quick fill connector. It is
essential that all air in the system is allowed to escape
freely through automatic air vents and radiator bleeds,
failure to remove air could result in a system malfunction.
3750 Pulpress
pressurisation unit
2 Turn on the water supply feeding the 3750 Pulpress unit
and fill the breaktank.
3 Check pumps are primed by loosening cap on the delivery
side of the pump–let water escape until no air is present,
replace caps and pressurize to the ambient temperature
set pressure. "Never dry run the pumps".
4 With cover interlock isolating switch in the off position
switch on the power supply to the unit.
16.0 operation
Turn the main isolating switch to the 'On' position. The
system pressure will be displayed on the digital readout. The
unit will automatically maintain pressure in the system as
set out in the design criteria and will only operate when the
pressure falls between the system fill pressure and the pump
cut-in pressure.
17.0 heating system
Start the boiler(s). The water from the system will flow into
the vessel(s) and the system pressure will rise slowly and
settle at a pressure below the maximum pressure shown on
the nameplate. If the boiler safety valve lifts, check the valve
setting and the system details, against the ordering specifica-
tion for the 3750 Pressurisation unit.
18.0 chiller systems
When the chiller(s) are started the water contracts as it cools
and the 3750 pressurisation unit will pass water from the
tank via the pump, to bring the pressure up to the ambient
temperature setting pressure. When the chiller is switched
off the expanding water will pass into the expansion vessel,
the pressure will rise and settle at a pressure below the maxi-
mum pressure shown on the nameplate.
note
On chiller sets, the highest system pressure will occur when
the system is at ambient temperature after operation, where-
as on heating sets the highest pressure occurs at maximum
system operating temperature.
If the system pressure falls due to a slow leak, water in the
expansion vessel(s) will run back into the systems.
If the system leakage continues causing a drop in pressure
below the initial system pressure the pump(s) will start to
restore the initial system pressure.
In the event of a leak exceeding the pump(s) capacity then,
providing the set's volt free contacts have been wired accord-
ingly, the boiler burners will be shut down and the circulating
pumps are stopped. The system should then be closed down
and the leak rectified.
i n sta l l a ti o n &
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