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3.5.
Unit mode
The Unit Mode is used to define if the chiller is configured to produce chilled or heated water. This parameter is related to the unit
type and is set in factory or during commissioning operation.
Current mode is reported in the main page
.
The path in the Web HMI interface for Unit mode
configuration is “
Main Menu
→
Unit Mode
→
Mode
”.
Menu
Parameter
Range
Description
02
00
(
Unit Mode
)
0 = Cool
Set if chilled water temperature up to 4°C is required. No glycol is
generally needed in the water circuit unless ambient temperature may
reach low values. In case of water greater than 4°C, but water circuit with
glycol, set mode “Cool with glycol”.
1 = Cool with glycol
Set if chilled water temperature below 4°C is required. This operation
requires proper glycol/water mixture in the plate heat exchanger water
circuit.
2 = Cool / Heat
Set in case a dual cool/heat mode is required. This setting implies an
operation with double functioning which is activated through the physical
switch or BMS control.
=”=!
•
COOL:
The unit will work in cooling mode with the Cool LWT as the
Active Setpoint.
•
HEAT
: The unit will work in heat pump mode with the Heat LWT as
the Active Setpoint.
3 = Cool / Heat with glycol
Same behavior of “Cool / Heat” mode but Chilled water temperature below
4°C is required or glycol is present in the water circuit.
3.5.1. Heat/Cool Mode
Heat/Cool operating mode can be set using a Digital Input.
All settings related to Cooling-Heating operation will produce a real mode change only if Unit Mode parameter (refer to menu 01) is
set to:
▪
Heat/Cool
▪
Heat/Cool w/Glycol
In all other cases no mode switch will be allowed
Menu
Parameter
Range
Description
02
00
(
Unit Mode
)
0 = Cool
Only cooling mode is permitted
1 = Cool with glycol
2 = Cool / Heat
Both heating and cooling mode is permitted
3 = Cool
/ Heat with glycol
Digital input reference
Digital input state
Description
Cool/Heat switch
Opened
Cooling mode is selected
Closed
Heating mode is selected
3.6.
Pumps and Variable Flow
The UC can manage one water pump connected to the water plate heat exchanger. The pump control type is configured in page
[15] and can operate in two different ways:
1.
Fixed Speed
2.
DeltaT
Menu
Parameter
Descriptiion
R/W
Psw
15
(Customer Configuration)
00
(
Evaporator
Pump Ctrl Mode
)
0 = On- Off
1 = Fixed Speed
3 = DeltaT
W
1
04
(
Cond Pump Ctrl Mode
)
0 = On- Off
1 = Fixed Speed
3 = DeltaT
W
1
The path in the Web HMI interface for Pump Ctrl Type is
“
Main Menu
→
Commission Unit
→
Configuration
→
Options
→
Evap
Pump Type
”/ “
Main Menu
→
Commission Unit
→
Configuration
→
Options
→
Cond
Pump Type
”.
3.6.1. Fixed Speed
First control mode,
Fixed Speed
, allows an automatic pump speed variation, between two different speeds.
Main Settings are:
1.
Speed 1
2.
Standby Speed
