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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 &

o p er at i ng i nstr ucti o n s