-
16
-
-
17
-
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 .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 .
Model
Fuse Size (AMPS)
All models
5
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:
The APU Midi is fitted with an internal re-settable fuse, see Section 11 .
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 .
z
Ensure the unit is sited in a frost free area, away from precipitation and
water sprays/jets .
z
All necessary pipe/electrical connections should have been made to a
satisfactory standard by a qualified person .
z
The temperature and pressure at the point of connection are within the
operating limits of the pressurisation unit .
z
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 .
z
Ensure the system connection has been made into the heating/chiller
system return header .
z
Ensure non-return valves, pressure reducing valves or RPZ valves are
NOT
installed between the pressurisation unit and the heating/cooling system .
z
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 .
z
Ensure the heating/cooling system is filled and pressurised to the required
cold fill pressure, with the water at approximately ambient temperature .
z
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:
z
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 .
z
A suitable gauge should be used to check the charge pressure .
z
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 .
z
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 .
z
When the correct pressure is set the Schrader valve protective cap must
be replaced .
z
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 .
Fig. 19
Retainer
Cable tie
