Adey Midi 235 Installation And Servicing - Page 9

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4) Re-insert connector into the correct location on the control board and

route the cable to the back of the APU Midi and secure with a cable tie to

the retainer .

5 .24 RS 485 Modbus – BMS Connection:

RS 485 is available on this product for BMS connection and is enabled in the

Advanced settings menu .

5 .25 Fuses: The following fuse size should be used:

Model

Fuse Size (AMPS)

All models

The APU Midi is fitted with an internal re-settable fuse, see Section 11 .

5 .26 Supply cord replacement:

The supply cord and internal wiring within the terminal box are routed

and secured to ensure compliance with the electrical standard EN

60335-1. It is essential that prior to any disturbance of this internal

wiring, all cable routing and securing details are carefully noted to

ensure re-assembly to the same factory pattern is always maintained.

If the supply cord is to be changed or is damaged, it must be replaced

with a special cord assembly available from ADEY or one of their

approved repairers .

On disassembly note the cord retention and routing system .

Re-assemble to the same pattern . For information on cable connection

consult the wiring diagram .

Cable tie

Retainer

Fig. 19

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6 COMMISSIONING

6 .11 Pre-commissioning checklist:

Before starting the commissioning process the following conditions must be met .

If these conditions are not adhered to, damage to the equipment, system and

property may result .

Ensure the unit is sited in a frost free area, away from precipitation and

water sprays/jets .

All necessary pipe/electrical connections should have been made to a

satisfactory standard by a qualified person .

The temperature and pressure at the point of connection are within the

operating limits of the pressurisation unit .

The heating/cooling system is fitted with a safety valve and expansion

vessel sized appropriately .

6 .12 In order for the pressurisation unit and heating/cooling system to function

correctly the following conditions must be met . If these conditions have not

been met, the commissioning process should not continue .

Ensure the system connection has been made into the heating/chiller

system return header .

Ensure non-return valves, pressure reducing valves or RPZ valves are NOT

installed between the pressurisation unit and the heating/cooling system .

The expansion vessel is pre-charged to the correct pressure (equal to

initial system design pressure) .

6 .13 Prior to commissioning fill the heating/cooling system via a filling loop if

possible . If this is not possible, the pressurisation unit can be used to fill the

system after commissioning has taken place . Depending on the size of the

system, this may take a considerable amount of time . The system fill

function of the unit will stop after 24 hours, if further filling is required,

reset this function .

Ensure the heating/cooling system is filled and pressurised to the required

cold fill pressure, with the water at approximately ambient temperature .

Ensure the system is dosed with a suitable corrosion inhibitor . Note the

APU Midi is not designed for dosing chemicals into the system, this must

be done via other means .

6 .14 Expansion vessel setting:

To set or check the expansion vessel charge pressure the lock-shield

valve between the APU Midi and the vessel must be closed and the

vessel drained using the drain valve .

A suitable gauge should be used to check the charge pressure .

If the charge pressure is too high it can be reduced by releasing air from

the vessel pre-charge valve or by using a pressure gauge with an integral

air release valve .

If the charge pressure is too low a small increase can be provided using a

car foot pump otherwise an oil free compressor or nitrogen bottle is

recommended .

When the correct pressure is set the Schrader valve protective cap must

be replaced .

Check the integrity of the pipe-work . Ensure the lock-shield valve

between the system and the expansion vessel is open and the drain

valve is closed .

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