Daikin EWAD820T-XSB2 [10/81] Mechanical options on request

OPTIONS

10/73

with Master / Slave control is possible to:

- balance the working hours of the compressors enhancing reliability and extending the life of the

system;

- balancing the load between the units to maximize the efficiency of the system;

In order to operate in Master / Slave mode an additional probe (PT1000 or NTC10K) must be installed

on the common line of the plant and connected to the master unit. The additional probe is not provided

by the factory. Master / Slave can manage units selected with pump on board (fix speed and inverter

driven pumps).

Note: check valves must be installed at the outlet of each chiller. Master / Slave can also manage the start

and stop of external pumps (not provided by factory). The power supply of external pumps is not

provided by the unit.

Mechanical options (on request)

Total Heat Recovery (opt. code 01) A plate to plate heat exchanger for each refrigerant circuit is

installed in series to the air condenser coil. There is no switch nor solenoid valve in the circuit, thus

compressor discharged refrigerant is always flowing through the heat recovery exchanger and warm

water production is always available while the chiller is providing cooling. The amount of heat recovered

is about the 80/85% (according to the operating conditions) of the total heat rejection of the chiller. The

chiller perform the control on the recovery circuit, based on the return water temperature to the unit. Heat

recovery capability is subject to cooling load demand (if no cooling demand is present then no heat

recovery is available) - Opt. incompatibility: 03

Partial Heat Recovery (opt. code 03) A plate to plate heat exchanger for each refrigerant circuit is

installed in series to the air condenser coil. There is no switch nor solenoid valve in the circuit, thus

compressor discharged refrigerant is always flowing through the heat recovery exchanger and warm

water production is always available while the chiller is providing cooling. The unit controller does not

manage the partial heat recover operation. The recover must be managed from the plant manager that

controls the operation of the pump on the recovery circuit. The amount of heat recovered is about the

15/20% (according to the operating conditions) of the total heat rejection of the chiller. Heat recovery

capability is subject to cooling load demand (if no cooling demand is present then no heat recovery is

available) - Opt. incompatibility: 01