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EWAD420T-XSB2
Технические данные Страница: 13

Daikin EWAD420T-XSB2 [13/81] Inverter kit for pumps

Daikin EWADC17T-XLB3 [13/81] Inverter kit for pumps

OPTIONS

13/73

Fans speed regulation opt. code 99a) - Continuous fan speed regulation of all fans (VFD driven) for

improved sound level of the unit during low ambient temperature operation. At very low temperatures,

all fans except the first are switched off thus allowing unit operation down to -18°C - Opt.

incompatibility: 142-42-96.

Ground fault relay (opt. code 102) To shut down the entire unit if a ground fault condition is detected.

Rapid restart (opt. code 110) Rapid Restart is the ideal solution for those application where we cannot

afford the loose of cooling such as data centers, health care facilities, process cooling …etc. For this kind

of applications, in case of a power failure, chiller equipment are required to restore the cooling supply to

the system as fast as possible. Standard unit (without the Rapid Restart option) will be starting within

310 seconds after the power is restored and it will be reaching full load cooling capacity within 20 ÷ 25

minutes (obviously depending on the load demand). Rapid Restart is allowing the chiller to start as fast

as 30 seconds after power is restored and to reach full load cooling capacity in less than 6 minutes from

the unit restart.

For more details about this option please refer to the Control Manual.

Inverter kit for pumps:

- INVERTER KIT FOR 1 CENTR PUMP LOW LIFT (opt. code 120e) Opt. incompatibility: 79-80- 81-

120f-120g-120h

- INVERTER KIT FOR 1 CENTR PUMP HIGH LIFT (opt. code 120f)

Opt. incompatibility: 78-

80-

81-120e -120g-120h

INVERTER KIT FOR 2 CENTR PUMPS LOW LIFT (opt. code 120g)

Opt. incompatibility: 78-

79-81-120e -120f-120h

INVERTER KIT FOR 2 CENTR PUMPS HIGH LIFT (opt. code 120h)

Opt. incompatibility: 78-

79-80-120e -120f-120g

note: the Inverter kit must be associated with the corresponding hydronic kit (opt. code 78/79/80/81).

Piping between the inertial tank and the unit is not included. Electric heater power supply has to be

provided from external source.

The inverter kit can be used for the following purposes:

Tuning the water flow during unit commissioning.

- Control the pump speed via external input from Building Management System (BMS). For this

application a 0-10V signal for the pump speed must be provided from the plant manager according to the

specific control strategy of the plant. The water must be within the minimum and maximum value

allowed for the unit (refer to the “Operating limit” chapter). The change in water flow rate must not be

exceed more than 10% of the design water flow rate per minute.

- Set a “thermostat off” pump speed . Providing the unit with the inverter kit for the on-board pump is

possible to manage two different water flow settings. A setting for water flow during the "Thermostat

ON" mode (when the chiller is actually providing cooling to the plant), and a set for the “thermostat off”

mode (when the plant load is satisfied and the compressors are waiting to start). This feature allows to

achieve energy saving on plant operating cost by reducing the speed of the pumps when the chiller has

reached the set point.

Daikin EWAD420T-XSB2 [13/81] Inverter kit for pumps

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