22
30. 07. 20. Document Number 671760
Nuaire |
Western Industrial Estate
|
Caerphilly
|
CF83 1NA
|
nuaire.co.uk
BPS V-CO
Installation Manual
8.0 CONTROLS
The system incorporates a preconfigured BACnet MS/TP enabled
controller.
74
Connect Controller
8.1 Controllable Items
•
Supply Fan
•
Extract Fan
•
Heat Recovery Bypass Damper (if applicable).
•
Thermal Wheel (if applicable).
•
Heating Coil (if fitted).
•
Cooling Coil (if fitted).
•
DX coil (If fitted).
•
Inlet Damper (If fitted).
•
Exhaust Damper (If fitted).
•
Recirculation damper (If fitted).
8.2 Enable Signal
The unit can be enabled via the following methods:
•
Software switch (ENABLE) via local display or network.
•
Switched live (230VAC) input, PIR etc.
•
Volt free input contacts.
•
Night Cooling / Summer free-cooling strategy.
•
Scheduled via weekly calendar (Schedules are accessed and
adjusted via the ESCO-LCD).
•
Fan speed override.
•
Room module PIR sensor.
•
Room module 3-fan speed button (While in low, med or high
state).
When the enable signal is removed, the unit will run on for a time
defined by the run-on setpoint.
If auto run-on is enabled, the unit will measure the each enable period
and set a dynamic run-on time proportionally to this value. This time is
scaled by the network input “Auto Run-on Scale Factor” and limited by
the input “Auto Run-on Max Time”.
8.3 Occupancy Control
Ecosmart Connect control allows the connection of multiple
Room Modules which are automatically detected and connect to
the controller via a SA (Sensor Actuator) MS/TP bus. See Network
Accessory section for more connection details.
8.3.1 PIR Room Sensor
When a Room Module PIR sensor is connected via the SA bus, the
control will automatically use this as an enable signal by default. There
is a non-adjustable minimum run-on time of 15mins for Room Module
PIR's. This is in addition to any software run-on times.
8.3.2 RM 3-Speed Fan Override (ESCO-TDFS Only)
When a RM fan speed override is available it will override fan speed
functions. This function overrides any run-on time (except for electric
heater heat dissipation).
While in override mode, the unit will ignore return air temperature and
set the supply air to the setpoint. Multiple fan override sensors are not
supported.
Whenever a fan-speed override Room Module is connected, the display
will automatically show the fan speed status at all times.
A timeout can be set for the fan mode to revert back to auto after a
predetermined time period. The setting Fan Override Operation and Fan
Override Timeout can be adjusted to achieve this.
Mode
Operation
Display
“Auto”
The Controller will ignore the
fan speed override. Current Fan
speed will still be displayed.
“Off”
The controller will override all
functions and stop the fans.
“Low”
The fans run at low speed.
“Medium”
The fans run at medium speed.
“High”
The fans run at high speed.
8.3.3 RM Occupancy Display
If an RM sensor with occupancy display is connected, it will
automatically display the occupancy state as follows.
State
Description
RM Display
Occupied
An enable signal is present
i.e. Fans are running.
Unoccupied
No enable & no trickle
i.e. Fans are stopped.
Standby
No enable signal but fans are
trickling.
8.4 Thermal Wheel / Plate Heat Exchanger Bypass
The plate heat exchanger bypass damper and thermal wheel both run
on the same FAC relay 5. Energised = Bypass. See the temperature
control section for info on the bypass strategy.
•
Thermal Wheel
Runs on a vault free enable signal, which is produce using a
combination of the HX bypass relay and fan run relay to close the
circuit of fans are running and the unit is not in bypass.
•
Plate Heat Exchanger
The HX bypass damper opens on a 24 Vac signal which is produce
from the bypass damper relay.
