Evco EVD MVC Series Applications Manual

EVCO S.p.A.
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If none of the above situations apply, the damper opening is determined by the reg
time band in progress.
10.6
Temperature regulation
The temperature regulation algorithm is of the "incremental neutral zone" type previously described. The temperature used for
regulation can be the room temperatu
re or the supply temperature if only one of these probes is configured. If neither of the probes is
configured or if they are in error, temperature regulation is inhibited.
If a 3 point valve is configured, the temperature regulation is “frozen” when it is
the valve.
If both the probes (room and supply) are configured, the regulation probe is the supply temperature but the setpoint is adjus
room temperature (follow-
on regulation) as shown in t
Cooling
10.6.1 Treatment coils
The controller is able to manage one or two coils for heating and cooling of the air emitted into the room. The purpose of th
together with the recovery heat exchanger, is to guarantee th
environment.
The first coil can be hot, cold or reversible according to parameter C30. The second coil can only be hot and can be used as:
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The single heating source (in the winter cycle) if th
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The second heating level (in the winter cycle) if the first coil is hot or reversible, always as post
first coil is reversible (if the first coil is hot
dehumidifying is not possible and therefore post
The coils are allocated according to the resources used.
If the first coil is not configured, then neither is the second.
The types of coils managed are as follows:
- Direct expansio
n coil: can be hot, cold or reversible
-Three-point water coil:
can be hot, cold or reversible
valve relays. The duration of t
he valve action is determined by parameter C33.
- Water coil ON-OFF:
can be hot, cold or reversible
- Modulating water coil:
can be hot, cold or reversible
as analogue output 0-10 V and the
Open water valve
-
One or two step electric coil: can only be hot. It uses the
- Modulating electric coil: ca
n only be hot. It uses the
triac/OC output configured as
Electric heater
is greater than 0,
the analogue output is controlled in PWM with a period of C31 seconds and with the maximum output signal
amplitude determined by parameter C32. For example, if C31=10 seconds, C32=8 V and regulation with 50% regulation, the output
signal takes on the valu
e 8 V for 5 seconds and the value 0 V for another 5 seconds. If however, C31=0 the output is modulating
(where the output voltage corresponds to the percentage of heat regulation required).
N.B. The electric and direct expansion coils are only switched on
fans are switched on, to guarantee airflow and avoid any possible overheating problems.
EV3 MVC & EVD MVC
| Application manual ver. 2.2
page 52 of 74
If none of the above situations apply, the damper opening is determined by the reg
ulation setpoint (P14…P17) associated with the
Temperature regulation
The temperature regulation algorithm is of the "incremental neutral zone" type previously described. The temperature used for
re or the supply temperature if only one of these probes is configured. If neither of the probes is
configured or if they are in error, temperature regulation is inhibited.
If a 3 point valve is configured, the temperature regulation is “frozen” when it is
in motion so as to maintain control of the position of
If both the probes (room and supply) are configured, the regulation probe is the supply temperature but the setpoint is adjus
on regulation) as shown in t
he diagram below.
Heating
The controller is able to manage one or two coils for heating and cooling of the air emitted into the room. The purpose of th
together with the recovery heat exchanger, is to guarantee th
at the ideal temperature is maintained in the air
The first coil can be hot, cold or reversible according to parameter C30. The second coil can only be hot and can be used as:
The single heating source (in the winter cycle) if th
e first coil is cold only and as post-
heating in the summer cycle
The second heating level (in the winter cycle) if the first coil is hot or reversible, always as post
-
heating in the summer cycle if the
dehumidifying is not possible and therefore post
-
heating does not apply).
The coils are allocated according to the resources used.
If the first coil is not configured, then neither is the second.
n coil: can be hot, cold or reversible
depending on parameter C30. It uses the
Compressor
can be hot, cold or reversible
depending on parameter C30. It uses the
Open water valve
he valve action is determined by parameter C33.
can be hot, cold or reversible
depending on parameter C30. It uses the
Open water valve
can be hot, cold or reversible
depending on parameter C30. It uses the
Water valve
Open water valve
relay to enable (optional)
One or two step electric coil: can only be hot. It uses the
Step 1 heater and the Step 2 heater relays
n only be hot. It uses the
Electric heater
analogue output configured as analogue output 0
Electric heater
. The Step 1 heater is used to enable
. If parameter C31 (electric heater activation period)
the analogue output is controlled in PWM with a period of C31 seconds and with the maximum output signal
amplitude determined by parameter C32. For example, if C31=10 seconds, C32=8 V and regulation with 50% regulation, the output
e 8 V for 5 seconds and the value 0 V for another 5 seconds. If however, C31=0 the output is modulating
(where the output voltage corresponds to the percentage of heat regulation required).
N.B. The electric and direct expansion coils are only switched on
when the time A06 (flow alarm bypass) has elapsed from when the
fans are switched on, to guarantee airflow and avoid any possible overheating problems.
| Application manual ver. 2.2
c | Code 1443DMVCI224
ulation setpoint (P14…P17) associated with the
The temperature regulation algorithm is of the "incremental neutral zone" type previously described. The temperature used for
re or the supply temperature if only one of these probes is configured. If neither of the probes is
in motion so as to maintain control of the position of
If both the probes (room and supply) are configured, the regulation probe is the supply temperature but the setpoint is adjus
ted to the
Heating
The controller is able to manage one or two coils for heating and cooling of the air emitted into the room. The purpose of th
ese coils,
at the ideal temperature is maintained in the air
-conditioned
The first coil can be hot, cold or reversible according to parameter C30. The second coil can only be hot and can be used as:
heating in the summer cycle
heating in the summer cycle if the
heating does not apply).
Compressor
relay
Open water valve
and Close water
Open water valve
relay.
Water valve
analogue output configured
analogue output configured as analogue output 0
-10 V or a
. If parameter C31 (electric heater activation period)
the analogue output is controlled in PWM with a period of C31 seconds and with the maximum output signal
amplitude determined by parameter C32. For example, if C31=10 seconds, C32=8 V and regulation with 50% regulation, the output
e 8 V for 5 seconds and the value 0 V for another 5 seconds. If however, C31=0 the output is modulating
when the time A06 (flow alarm bypass) has elapsed from when the

Evco EVD MVC Series Specifications

General

Brand	Evco
Model	EVD MVC Series
Category	Controller
Language	English