Peak Limiter Arm Signals; Shutting Down For Long Periods; Routine Maintenance - CLIMAVENETA WWR MTD - MTD/s, BWR MTD - MTD/s Installation And User Manual

PEAK LIMITER ALARM SIGNALS
The heat pumps can be fitted with a single-phase or three-phase peak limiter to reduce compressor start-up current.
Peak limiter single-phase
The LED on the peak limiter identifies different operating or alarm conditions based on the sequence of flashes:
• 2 flashes every 5 sec.: line voltage present, correct operation
• LED on for 5 sec. and LED off for 5 sec.: peak limiter faulty
• quick flashes for 10 sec.: line voltage out-of-range

SHUTTING DOWN FOR LONG PERIODS

After deactivating the chiller:
- Make sure the remote switch SA1 (if featured) is off.
- Make sure the remote keypad (if featured) shows "OFF".
- Place QF1 in the OFF position (see wiring diagram)
- Deactivate the indoor terminal units by placing the switch
of each unit in the "OFF" position.
- Close the water valves.
If the outside temperature may fall below zero; there is
the risk of freezing.
The water circuit MUST BE EMPTIED AND CLOSED (if
draining after operation in heat pump mode, beware that
the water may be hot), or antifreeze must be added in
the proportion recommended by the manufacturer.

ROUTINE MAINTENANCE

Never perform any cleaning operations before having
disconnected the unit from the mains power supply.
Terminals 10, 11, 12 and 13 may be live even when the
unit has been disconnected.
Make sure power is not connected before proceeding.
Regular maintenance is fundamental to maintain the effi-
ciency of the unit both in terms of operation and energy con-
sumption.
The Technical Service maintenance plan must be observed,
with an annual service which includes the following opera-
tions and checks:
- Filling of the water circuit;
- Presence of air bubbles in the water circuit
- Efficiency of safety devices
- Power supply voltage
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WWR MTD - BWR MTD GB 03/2010
It is recommended to use non-toxic food grade
antifreeze, compliant with the standards in force in the
countries where the unit is used, if domestic hot water
production is also featured.
If the mains switch is turned to "OFF" for more than
four hours, after turning it on and before reactivating the
unit, leave the power on but the unit deactivated for at
least two hours to preheat the oil in the compressor
sump.
- Power input
- Tightness of electrical and water connections
- Condition of the compressor contactor
- Verification of operating pressure, superheat and subcooling
- Efficiency of the compressor heater
During the maintenance operations, the chiller inspection
panel may need to be removed. If this is the case, proceed
as follows:
- Open the door of the electrical panel.
- Undo the screws as shown in the figure
- Remove the inspection panel
To replace the inspection panel, repeat the procedure in
reverse.
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