Toshiba Estia RUA-CP1701H, Service Manual

Page: 55 / 164

Monobloc Outdoor Unit Service Manual
54
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Variable Speed Pump Option (pmp_type = 2)
The variable speed pump option is fitted in the factory. Speed control of the pump is available from the NHC board via
an internal contactor as shown below:
The variable speed hydronic module can be set to control using either of the following pump control methods:
•
Constant adjustable speed
OR
•
Constant
∆
T
The method of control, used for the variable speed hydronic module, is set using the Variable Speed Pump Logic
parameter [P566]:
Par.No Description Range Default
566
Variable speed pump logic – (vsp_log):
0 = Adjustable speed control (using [P568 –
maximum pump speed])
1 = speed controlled by water
∆
T
0 ~ 1 1
•
Constant adjustable speed logic ([P566] = 0)
Depending on the hydraulic circuit it is possible to set a constant pump speed to have the expected flow rate
(depending on the circuit pressure drop).