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NOTE: each parameter in "Pr2" can be removed or put into "Pr1" (user level) by pressing "SET" + n.
When a parameter is present in "Pr1" LED
3.8 HOW TO CHANGE THE PARAMETER VALUE
1. Enter the Programming mode.
2. Select the required parameter with o or n.
3. Press the "SET" key to display its value (measurement unit starts blinking).
4. Use o or n to change its value.
5. Press "SET" to store the new value and move to the following parameter.
To exit: Press SET + UP or wait 15s without pressing a key.
NOTE: the new programming is stored even when the procedure is exited by waiting the time-out.
3.9 ON/OFF FUNCTION
By pushing the ON/OFF key, the instrument shows "OFF". During the OFF status, all the
relays are switched OFF and the regulations are stopped; if a monitoring system is
connected, it does not record the instrument data and alarms.
N.B. During the OFF status the Light and AUX buttons are active.
4. FAST ACCESS MENU
FAST ACCESS MENU
HM Fast access to Clock settings; (if present)
An Fast access to analog output reading; (if present)
SH Superheat: shows the actual superheat value; (Only XM669K)
oPP Valve opening percentage: shows actual opening percentage of the valve; (Only XM669K)
dP1 Probe 1 value displaying shows the temperature measured by probe 1;
dP2 Probe 2 value displaying shows the temperature measured by probe 2;
dP3 Probe 3 value displaying shows the temperature measured by probe 3;
dp4 Probe 4 value displaying shows the temperature measured by probe 4;
dP5 Probe value displaying shows the temperature value measured by probe 5; (Only XM669K)
dP6 Probe 6 value displaying shows the temperature measured by probe 6; (Only XM669K)
dPP Pressure probe value shows the value of pressure measured by pressure transducer; (Only
XM669K)
rPP Remote pressure probe value show the value of pressure received by remote pressure probe
connected to other XM600K device; (Only XM669K)
L°t minimum measured temperature shows the minimum temperature read by the regulation probe;
H°t Maximum measured temperature shows the maximum temperature read by the regulation
probe;
dPr Virtual regulation probe value shows the value measured by virtual regulation probe;
dPd Virtual defrost probe value shows the value measured by virtual defrost probe;
dPF Virtual fans probe value shows the value measured by virtual fan probe;
rSE Real set point: shows the set point used during the energy saving cycle or during the continuous
cycle.
5. THE SECTION MENU
This menu allows the user to access to a particular feature of the XM series related to the LAN (Local
Area Network) of controllers. A single keyboard, depending on the programming of this menu, is able to
control either the module of the local section of the LAN or ALL. The possibilities are: LOC: the
keyboard controls and display the value, the status and the alarms of the local section of the LAN; ALL:
the command given by the keyboard are effective on all the sections of the LAN.
Push the o key for more than 3 seconds
1.
2.
The label corresponding to the section controlled by the keyboard will be displayed.
With o or n key select the section you want to control.
3.
4.
Press "Set" key to confirm and exit
6. REAL TIME CLOCK FUNCTIONS (IF PRESENT)
The following functions are available only if the Real Time Clock is present. To get access to real time
clock submenu:
1. Enter the Programming mode by pressing the SET and DOWN key for few
seconds (measurement unit starts blinking).
SET
+
2. The instrument will show RTC label;
3. Press SET. You are in RTC function menu;
6.1 TO SET CURRENT TIME AND DAY
Hur Current hour (0 ÷ 23 h)
Min Current minute (0 ÷ 59min)
dAY Current day (Sun ÷ SAt)
Hd1 First weekly holiday (Sun ÷ nu) Set the first day of the week which follows the holiday times.
Hd2 Second weekly holiday (Sun ÷ nu) Set the second day of the week which follows the holiday
times.
Hd3 Third weekly holiday (Sun ÷ nu) Set the third day of the week which follows the holiday times.
N.B. Hd1,Hd2,Hd3 can be set also as "nu" value (Not Used).
6.2 TO SET ENERGY SAVING TIMES
ILE Energy Saving cycle start during workdays: (0 ÷ 23h 50 min.) During the Energy Saving cycle
the set point is increased by the value in HES so that the operation set point is SET + HES.
dLE Energy Saving cycle length during workdays: (0 ÷ 24h 00 min.) Sets the duration of the Energy
Saving cycle on workdays.
ISE Energy Saving cycle start on holidays. (0 ÷ 23h 50 min.)
dSE Energy Saving cycle length on holidays (0 ÷ 24h 00 min.)
HES Temperature increase during the Energy Saving cycle (-30÷30°C / -54÷54°F) sets the
increasing value of the set point during the Energy Saving cycle.
1592023020 XM660K_XM669K GB r1.0 07.01.2013.doc
is on.
6.3 TO SET TIMED DEFROST PARAMETERS
Ld1÷Ld6 Workday defrost start (0 ÷ 23h 50 min.) These parameters set the beginning of the eight
programmable defrost cycles during workdays. Ex. When Ld2 = 12.4 the second defrost starts at
12.40 during workdays.
Sd1÷Sd6 Holiday defrost start (0 ÷ 23h 50 min.) These parameters set the beginning of the eight
programmable defrost cycles on holidays. Ex. When Sd2 = 3.4 the second defrost starts at 3.40 on
holidays.
To disable a defrost cycle set it to "nu"(not used). Ex. If Ld6=nu ; the sixth defrost cycle is
disabled
7. ELECTRONIC EXPANSION VALVE MENU (ONLY FOR XM669K)
1. Enter the Programming mode by pressing the SET and DOWN key for few
seconds (measurement unit starts blinking).
SET
+
2. Press arrows until the instrument shows EEU label;
3. Press SET. You are now in EEV function menu.
8. CONTROLLING LOADS
8.1 THE SOLENOID VALVE
The regulation is performed according to the temperature measured by the thermostat probe that can be
physical probe or virtual probe obtained by a weighted average between two probes (see parameters
table description) with a positive differential from the set point. If the temperature increases and reaches
set point plus differential the solenoid valve is opened and then it is closed when the temperature
reaches the set point value again.
In case of fault in the thermostat probe the opening and closing time of solenoid valve is configured by
"Con" and "CoF" parameters.
8.2 STANDARD REGULATION AND CONTINUOUS REGULATION
The regulation can be performed in two ways: the goal of the first way (standard regulation) is
reaching the best superheat via a classic temperature regulation obtained using hysteresis. The second
way, permits to use the valve to realise an high performance temperature regulation with a good factor
of superheat precision. This second possibility, it can be used only in centralized plants and it is
available only with electronic expansion valve by selecting CrE=Y parameter.
In any case, the regulation is performed via PI regulator that gives the opening percentage to the valve
via PWM modulation explained as follow. Opening percentage is obtained from average of Opening
Time respect to CyP time period like following diagram:
With opening percentage we mean percentage of cycle period where valve is open. For example, if
CyP=6s (standard value) by saying: "The valve is opened at 50%"; this means that the valve is opened
for 3s during cycle period.
First kind of regulation:
In this case, the Hy parameter is the differential for standard ON/OFF regulation. In this case the int
parameter is neglected. The regulation follow this diagram:
Second kind of regulation – Continuous regulation (only XM669K):
In this case, the Hy parameter is the proportional band of PI in charge of room temperature regulation
and we advise to used at least Hy=5.0°C/10°F. The int parameter is the integral time of the same PI
regulator. Increasing int parameter the PI regulator become slow in reaction and of course is true vice
versa. To disable the integral part of regulation you should set int=0.
8.3 DEFROST
Defrost starting
In any case, the device check the temperature read by configured defrost probe before starting
defrost procedure, after that:
XM660K - XM669K
2/8
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