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CONDENSATION - when the digital input is closed the cooling loops are set to 0% to prevent
condensation happening. In this mode digital input is typically connected to a condensation sensor.
CONTACT ALARM - when the contact closes the "DI Contact Alarm" alarm message is displayed on
the screen.
NETWORK; the digital input is used for network monitoring purposes.
CLOSE/OPEN FOR BOOST - when digital input activates the controller operates in Boost mode, until
the digital input de-activates (only with CE-option). With the digital input boost the ’Target’ text is
replaced by ’Boost’ text.
Note: Digital Input Delay Timer parameter applies to all settings.
Analogue Outputs
The controller has three analogue 0-10Vdc outputs that are typically linked to the control loop outputs.
The following list states the possible options:
•
NETWORK; As a network 0-10Vdc output variable
•
HEATING STAGE 1; 0-10Vdc output is linked to Heating Stage 1
•
HEATING STAGE 2; 0-10Vdc output is linked to Heating Stage 2
•
COOLING STAGE 1; 0-10Vdc output is linked to Cooling Stage 1
•
COOLING STAGE 2; 0-10Vdc output is linked to Cooling Stage 2
•
EC FAN; 0-10Vdc output is linked to Fan Control Loop Output
•
CO2; 0-10Vdc output is linked to CO2 Control Loop Output (CO2 Models)
•
MAXIMUM VAV; 0-10Vdc linked to maximum of the Cooling stage 1 and CO2 loops
•
MAXIMUM FAN; 0-10Vdc linked to maximum of the CO2 loop and fan loop
•
HUMIDIFICATION; 0-10Vdc output is linked to Humidity Control Loop Output (RH Models)
•
DE-HUMIDIFICATION; 0-10Vdc output is linked to De-Humidity Control Loop Output (RH Mod-
els)
•
AMBER/RED; 0-10dc is @ 50% when Amber or Red alarm is active
•
RED; 0-10Vdc is @ 100% when Red alarm is active
•
HEATING STAGE 1 STAT; see RELAY OUTPUT / ON-OFF control chapter
•
COOLING STAGE 1 STAT; see RELAY OUTPUT / ON-OFF control chapter
•
FAN STAT; see RELAY OUTPUT / ON-OFF control chapter
•
AUX LOOP; see AUXILIARY HEATING CONTROL LOOP chapter
•
6-PORT; see 6-PORT VALVE control chapter
•
6-PORT REVERSE; see 6-PORT VALVE control chapter (reverse operation)
Analogue Output Scaling /
Output Limitation
Each of the analogue outputs (Y1,Y2,Y3) can have
•
Output minimum voltage (percentage)
•
Output maximum voltage (percentage)
The connected control loop output 0..100%is then scaled from minimum voltage to maximum voltage.
For example in the EC fan control, if the fan is required to run always at minimum level, the minimum
control output voltage can set to 10% (1V) and the maximum output 70% (7V). In this case the control
loop output 0..100% is scaled to be 10..70% at the analogue output. This allows maximum noise
levels to be limited and the fan to have a minimum fan speed.
The values are available via the communication network from network master read/write.
Relay Outputs / Fan Speed
Control
(SRC-701/SRC-703/SRC-704
H)
SRC-701(H), SRC-703 and SRC-704H have 3 relay outputs that be used to control 3-speed fans. The
relay 1 is switched ON approx. 30% of fan demand, relay 2 is switched ON at approx. 60% of fan
demand and relay 3 is switched ON approx 90% of fan demand. Only one relay is on at any given
time. The relays are switched OFF approx 20% below the fan switch ON level.
NOTE:For the fan relay outputs to operate, the Y1 (Analogue Output Y1 Mode) has be set to
’Modulating Fan’ (default setting).
NOTE:SRC-701H/704H relays are rated 7A resistive. SRC-701/703 relays are rated 0.5A
resistive.
Relay Output / On-Off
Control (SRC-703)
SRC-703 have 4th 230Vac relay that can be used to switch 230Vac On/Off. The output can be used to
switch heating valves, cooling valves or plant enable outputs.This is done by configuring the output Y2
setting to one of the dollowing settings:-
HEATING STAGE 1 STAT; thermostatic switching of output, 100% (SRT-703 RLY4 via Y2 ON) when
Heating1 Stage at 10% or over, switches back to 0% (SRT-703 RLY4 via Y2 OFF) when Heating1
Stage output 0%
COOLING STAGE 1 STAT; thermostatic switching of output, 100% (SRT-703 RLY4 via Y2 ON) when
Cooling1 Stage at 10% or over, switches back to 0% (SRT-703 RLY4 via Y2 OFF) when Cooling1
Stage output 0%
FAN STAT; thermostatic switching of output, 100% (SRT-703 RLY4 via Y2 ON) when Fan Loop at
10% or over, switches back to 0% (SRT-703 RLY4 via Y2 OFF) when Fan Loop output 0%
As default for SRC-703 the Y2 has been configured as ’HEATING STAGE1 STAT’.
