Principles of Operation of
the Module UCM-CLD
15RLC-SVU02F-E4
Local/ External unit control mode
From the Settings menu, the end
user can select the Control mode.
- Control Mode: No
In this case, the active cool and heat
setpoints and Heat/Cool selection
will come from the front panel (User
Settings 1).
- Control Mode: Partial
In this case, the active cool and heat
setpoints will come from the front
panel (User Settings 1). The active
Heat/Cool selection will come from
the external Cool/Heat input.
- Control Mode: Full
In this case, the active cool and heat
setpoints and Heat/Cool selection
will come from the external analog
and digital inputs.
- AI: External cooling setpoint input
(configurable)
This input will be powered in 0-1V
or 4..20mA. The configuration
(available from menu “User
Settings 2) will allowed 0-1V or
4..20mA signals. This signal will
create a cooling setpoint between
-17.8°C and 18.3°C.
Note: The A70 module will scale
automatically the value between
-12°C and 15°C.
Note: The input configuration must
be done before any signal
connection.
Refer to Table 4 for the setting rule.
- AI: External heating setpoint input
(configurable)
This input will be powered in 0-1V
or 4..20mA. The configuration will
allowed 0-1V or 4..20mA signals.
This signal will create a heating
setpoint between 25°C and 60°C.
Note: The input configuration must
be done before any signal
connection.
Refer to Table 3 for the setting rule.
- DI: External ON/OFF input
This input will be normally powered
in 24Vac. This input will be the
external Auto/Off unit.
0V "Open" : unit disabled
24Vac "Close" : unit enabled
- DI: External Heat/Cool input
(configurable)
This input will be normally powered
in 24Vac. This input will be the
external Heat/Cool mode switch.
0V "Open" : Cooling mode
24Vac "Close" : Heating mode
Table 4 - Input values vs. External chilled-water setpoint
3.6 7.2 -10
4.6 9.2 -5
5.6 11.3 0
6.7 13.3 5
7. 7 15 . 4 10
Resulting hot-water
set point
(°C)
Voltage
(V(dc))
Current
(mA)
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