25
9.4. Reduced speed forced operation input (or PV=low speed) (DI3)
The external forced low speed control (low speed 1/ 2) allows the unit to be forced to
operate at low speed.
It has priority if the Zehnder Eversky unit is switched off by the time programming.
It does not have priority if the Zehnder Eversky central unit is already in high speed
(1/1) via time programming.
The function is active when the contact is closed.
Hydraulic connection
Electrical connection
Respect the
direction of the
valve axis
The axis of the 3-way valve must not be
oriented upside down
Respect the
direction of fluid
flow
AB
A
B
B A
AB B
AB
A
AB
B
A
A
AB
B
A
B
AB
72
73
74
75
62
63
64
65
B7
71
61
DI3
(controller)
PV
9.5. Normal speed forced operation input (or HS=high speed) (DI4)
The external high-speed forced operation command (normal speed 1/1) is used to
force the unit to operate at high speed.
It has priority if the Zehnder Eversky unit is:
■
at low speed (1/2) by time programming
■
at low speed (1/2) by forced low speed operation
■
switched off by time programming.
The function is active when the contact is closed.
72
73
74
75
62
63
64
65
B7
71
61
DI4
(controller)
GV
78
79
80
68
69
70
B9
78
79
68
69
B8
3-way valve
(Hot water coil
only)
1
1 = black wire
2 = red wire
3 = white wire
75
DI5
DI6
DI7
DI8
Agnd
AO
1
AO
2
AO
3
AO
4
AO
5
76
77
78
90
91
92
93
94
95
1 - 8
AO1 - 5
- +2 3YS
Zehnder Eversky
