Accessory Functions - AERMEC GLFI10M Manuel D'utilisation

ACCESSORY FUNCTIONS

ENABLING VENTILATION
The figure showing season changeover (water side) and ventilation enabling indicates not only the season changeover (water side) thresholds but
also the ventilation enabling thresholds in Heating mode (Minimum value check) and Cooling mode (Maximum value check). Depending on the
setting of Dip 4, Normal band (heating enabling at 39°C, cooling enabling at 17°C) or Reduced band (heating enabling at 35°C, cooling enabling
at 22°C) is selected.
The absence of a water probe for 2-pipe systems prevents not only season operating changeovers but also Minimum water temperature checks in
Heating and Maximum water temperature checks in Cooling, so ventilation is always active.
In the case of a 4-pipe system with just one water probe, the probe is only used to check the Minimum ventilation value in Heating mode. If you
also want to check the Maximum value in Cooling mode, a probe must be installed on the cold water coil as well (the thermostat can manage
two water probes).
ANTI-FREEZE PROTECTION
The anti-freeze protection function makes sure the ambient temperature never falls to freezing values (even when the selector is OFF). If the
temperature falls below 7°C, the thermostat works in HEATING with a set value of 12°C and AUTO ventilation (as long as the water temperature
allows it). If there is no water probe, or continuous ventilation is enabled, the fan is always active. If there is a valve and an upstream water
probe, or no water probe, the heat exchanger undergoes a pre-heating cycle in any case. The thermostat quits anti-freeze mode when the
ambient temperature rises above 9°C.
EXTERNAL CONTACT LOGIC
The use of the thermostat envisages an external contact that, when closed, switches the thermostat OFF (except when the thermostat is in anti-
freeze mode or the ambient probe is faulty). This contact may be useful, for example, for managing inputs such as a window contact, faulty
circulating pump, etc.
SLEEP FUNCTION
The Sleep function on the VMF-E19 thermostat is available if the thermostat is interfaced with a presence sensor (with normally open logic)
connected to its SP input.
In practice, this function varies the fan coil adjustment setting if there is nobody in the room in question (lowering the value if heating mode is
active, or increasing it if cooling mode is active). The purpose is to ensure energy savings. More specifically, if the VMF-E19 thermostat board is
connected to a presence sensor, the SP input logic is as follows:
The new setpoint value, as per the above table, will be associated with the following:
If the thermostat goes into anti-freeze or emergency mode because of the ambient probe, the input will be inhibited.
N.B. Air-side changes to season are prohibited while the SP input is closed. This is to prevent erroneous state changes caused by Setpoint
variation.
COMFORT FUNCTION
In centralised systems in which units are connected to a network, their setpoint is decided by a central unit. The user has the possibility
of increasing or decreasing the setpoint based on the table below.
32
AGLFI10NFJ 2006_5905245_01
External Contact Input
Closed
Open
SP Input
Dip 7 Off
Open
Closed ∆ = 5°C
Setpoint = Setpoint value - Δ
Equation 1: For stand-alone thermostats
Setpoint = global setpoint value - Δ
Equation 2: For thermostats connected to a BMS system or an E5 panel
Dead band [°C]
2
2
Machine Status
OFF
ON
Heating
Dip 7 On Dip 7 Off
∆=0 ∆=0 ∆=0
∆ = 2°C ∆ = -5°C
Deviation from the setpoint
[°C]
+/- 3
+/- 6
Cooling
Dip 7 On
∆=0
∆ = -2°C