FläktGroup Multi-DENCO, Руководство по эксплуатации

Страница: 90 / 120

Commissioning Multi -DENCO
90 FläktGroup DC-2013-0101-GB • Subject to modifications • R4-05/2018
To set up the maximum design chilled water flow rate, on site:
•
The unit must be powered on, pre-commissioned and running under automatic
control
•
The chilled water pump must be operating to provide pressure differential across the
unit of 100 kPa (minimum 50 kPa, maximum 350 kPa)
•
Force the chilled water valve to 100% open by reducing the set-point temperature
(supply or return) to below the water temperatures within the chilled water circuit
•
Measure the chilled water flow rate using a hydronic manometer with the hoses
connected to the local orifice plate in the external chilled water pipework supplying
the unit (supplied/fitted by others)
•
To adjust the maximum chilled water flow rate to design conditions, adjust the
setting PIC Valve Max Value % to achieve the design maximum flow rate (see the
C5-12 controller manual for instructions on how to do this)
•
Record the maximum flow rate and PIC Valve Max Value %
8.3.8 Variances for winter kit
Units operating in low ambient temperatures may be fitted with a winter kit. The system
operates as a 'liquid backup'. At high ambient temperatures, the system regulates so
that liquid refrigerant is stored in the liquid receiver. At low ambient temperatures liquid
refrigerant is stored/backed-up in the condenser coil instead.
The components of the winter kit are:
– Electronic Regulation Valves (ERV)
– Condenser fans
– Liquid receiver with trace heating
– Control circuit transformer for controlling the ERVs (Evolution Driver)
– Control panel heater
– Mains Circuit Breaker (MCB) in the indoor units electrical panel (power supply to the
winter kit)
Commissioning engineers must observe the good practices with the following additio-
nal requirements for winter kits.