Operation and Maintenance Manual, OnyX Sky Heat Recovery Units, 2022/01
Frapol Sp. z o.o. reserves the right to introduce changes without any prior notice.
Page
32
NOTE
The device does not provide absolute protection for the systems working with the controller, and the
environment in which it operates. The components working with the controller should be connected
electrically in a manner ensuring safe activation of protection mechanisms, regardless of the algorithms
implemented by the controller, using, among other things:
•
Hard-wired control of the heater valve actuators, which is activated by the anti-freeze thermostat
•
Spring-return actuators for external dampers or control valves
•
Hard-wired disconnection of fans or the entire device, after receiving a signal from the SAP control unit
•
Back-up power supply systems, particularly for the device working with hydronic air heaters.
•
In the event of a power failure, the control unit for the circulating pump or the control valve without
a return spring may not be able to protect the water heat exchanger from freezing.
5.6.7
Connecting and checking temperaturesensors
NOTE
The sensors necessary to activate the controller and ensure its correct operation are the supply air
temperature sensor and the air intake temperature sensor that also measures the external (weather)
temperature.
Use only sensors of the
NTC
10K
type.
The sensor cables may be additionally extended, using cables with a cross-
section of ≥ 0.5
mm
2
, total cable length
≤ 15m.
NOTE
The sensors must be installed correctly and firmly according to the guidelines of the unit's manufacturer, and
protected against loosening on ventilation ducts.
The sensors must not be flooded with water or oils. Sensor cables should be separated from power supply
lines and heat sources (incorrect temperature indication). The minimum distance between such cables ≥
40cm.
The sensors must be connected to the controller according to the wiring diagram.
To check the sensors, measure their resistance at a given temperature. The table below shows the nominal resistance
values provided by the manufacturer.
NTC 10K
Ambient temperature [°C]
Nominal [Ω]
0
33620
10
20174
20
12535
30
8037
40
5301
50
3588
60
2486
70
1759
80
1270
90
933
100
697
110
529
120
407
