33
UAB KOMFOVENT we reserve the right to make changes without prior notice
RHP PRO_22-01
Terminals for the external elements of the controller board are numbered and are used only to connect external compo-
nents. These may remain empty if no additional features are required.
GND
~24V
~24V
~24V
~24V
~24V
~24V
~24V
GND
0..10V
0..10V
0..10V
0..10V
0..10V
0..10V
0..10V
NO
NO
NO
NO
NO
C
C
C
NTC
B5
INPUTS
OUTPUT
OUTPUTS
INPUTS
INPUT
OUTPUTS
B9 B8
B7
B6
FG1
DX
Indication
Humidity sensor
MODBUS
RS485
interface
Water pump
for heating 230V AC, 1A
Cold water
mixing valve /
DX capacity control
Heating damper
actuator
Humidifier
control
Return water
temperature sensor
Supply air
temperature sensor
External control
External stop
Fire alarm system
OVR control
Common
Air quality
sensor
Exhaust air
pressure sensor
Supply air
pressure sensor
Air damper
actuator
Operation
Alarm
Common
Water pump/
coil alarm
DX3 /
Heating
DX2 /
Cooling
DX1 /
Start
Common
External control
B1 TG3 TG2 TG1
S2
S1
NTC
A
GND
IN4
IN3
IN2
IN1
B
DIN
L
L
N
N
N
N
N
N
N
N
N
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
Water pump
for cooling 230V AC, 1A
Fig. 34.
Connection terminals for external components on the C5 main board
Total power of all external devices with 24 V supply voltage shall not exceed 25 W.
Modbus RS485 (1-3)
– data cable connection for controlling the unit from a building management system via Modbus
RTU protocol.
External management (4–8)
– terminals for controlling specific functions of the unit via external contacts which are
connected to a common terminal 8. These include thermostats, switches, motion sensors and other devices with normally
open or closed contacts. Activated functions will operate as long as those contacts are connected.
• Terminal 4
is used for activating recirculation (if a recirculation damper is ordered, controlled by an external contact) or
switching between heating and cooling modes when a combined water heater/cooler coil is fitted (when terminals are
connected, the water valve actuator and pump will be controlled by a cooling signal. For example, a thermostat can be
connected here to close terminals when cold water circulates in the system).
• Closing contacts
5
and
8
will stop the unit.
• Fire alarm requires a normally closed contact (NC), therefore, a jumper is connected between
terminals 6 and 8
, instead
of which, building fire system can be connected. When the contact is disconnected, the unit stops, fans speed up (accord-
ing to the order) and a fire alarm message is displayed.
• Terminal 7
actives an “Override” ventilation mode (OVR). This mode has priority over other AHU functions and may be
activated even when the unit is stopped (i.e. to start the unit by closing contacts). OVR function settings are set via the
control panel or computer. This function is active as long as terminals are closed.
B5 (9–10)
– when a water heater is installed, this terminal is used for connecting a return water temperature sensor (NTC
10kΩ) which protects against freezing.
