Daikin EWYD360BZSL handleiding
Handleiding
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The maximum load setpoint may be derived by a 4-20 mA input (4mA
→
limit=100%;
20 mA
→
limit=0%); or from a numeric input coming from monitoring system (network
demand limit).
•
SoftLoad
At unit startup (when the first compressor stats) a temporary demand limit may be set up
to a time expired.
6.19. Evaporator pumps
An evaporator pump is foreseen in the base configuration while a second pump is an
optional.
When the two pumps are selected, the system will automatically start the pump with lower
operating hours each time a pump has to be started. A fixed starting sequence may be set.
A pump is started when the unit is switched on; within 30 sec an evaporator flow switch
must close otherwise and “Evaporator Flow Alarm” will rise. The alarm is automatically reset for
three times if the evaporator flow switch closes for more than 30 seconds. Starting from the fourth
alarm it has to be reset manually.
6.19.1.
Inverter pump
2
Inverter pump is used to modify water flow through the evaporator in order to keep
evaporator water
∆
T at the rated value (or close to it) even if the required capacity is reduced due to
the switching off of some terminals. In fact, in this case the water flow across the remaining ones
increases as well as the pressure drops and the head required to the pump.
So the pump speed is reduced to reduce the water pressure drops across terminals at the
rated value.
Since a minimum flow through the evaporator is required (about 50% of rated one) as well
as inverter pumps may not run at low frequency, a minimum flow bypass is managed.
The flow control is based on the measurement of pressure difference across the pump (pump
head) and will act on the pump speed and on the bypass valve position.
Both actions are executed by 0-10V analog output.
In particular, since pressure drops across evaporators and piping change with flow while
pressure drops across terminal units are flow-independent, the pump required head (head setpoint)
is a function of the flow:
t
r
tr
P
f
f
Phh ∆+
⋅∆−∆=∆
2
)(
being
∆
h = required pump head at the supply frequency f (pump head target)
∆
h
r
= pump head at rated flow (pump head setpoint)
∆
P
t
= terminal units pressure drop at rated flow
f = pump required supply frequency
2
Inverter pump control is included in versions from ASDU01A.
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Productinformatie
| Merk | Daikin |
| Model | EWYD360BZSL |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 10110 MB |
