1150.11E
January 2007
www.produal.fi
Enquiries: T:
05 230 9200
F:
05 230 9210
Copyright
2005 Produal Oy. All rights reserved
Products meet the requirements of directive 89/336/EEC and standards EN50081-1: 1992 (Emission) and EN50082-2: 1995 (Immunity).
Controller options
Operation Modes
HLS34 has two operation modes: DAY and NIGHT. The unit can be switched between day and night modes
either via Modbus network or via the DAY EXTENSION typically connected to PIR. The user can also
change NIGHT mode to DAY mode by pressing “MAN IN THE HOUSE” (occupancy) button on the unit. After
2-hours (adjustable) DAY mode returns automatically back to the NIGHT mode. When in DAY mode the
controller operates the valve outputs according to the below diagram.
DAY MODE
In the DAY mode the temperature is controlled to the setpoint using PI-control. The controller has adjustable
dead zone between heating and cooling modes.
The controller DAY setpoint (SP) is calc ulated as follows:-
SP = SP
network
±
SP
local
, where SP
network
is setpoint set via Modbus network and SP
local
is the setpoint set by
the user by pressing “+” and “-“ buttons. SP
local
range is limited at the commissioning stage (default
±
3°C)
In the NIGHT mode the controller controls to the NIGHT/FROST setpoint. If the temperature falls below the
NIGHT setpoint (5..20°C), the heating output is opened and the fan is overridden on (if fan speed control has
been enabled). The NIGHT setpoint is adjustable via Modbus network or in the configuration mode.
When the controller returns to the DAY MODE from NIGHT, the controller DAY setpoint can return to the
DAY setpoint programmed previous day, or the DAY SP can be reset to the SP
network
Modbus Network
Setpoint. This is a configurable option (configuration parameter SP_ND). If no network setpoint is available
21°C is used as default.
Air-side application
Description of operation
