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rev 09.2017 - ©STULZ S.p.A. - all rights reserved
PRELIMINARY OPERATIONS
Chillers with a tank:
- when the machine is off, fill the tank to the maximum level.
Use a clean container that is not contaminated by fluids or other additives than those set forth for
filing. Do not mix different brands of products and/or additives.
Vent the air from the pump body (where required):
- when the machine is off, open the tap on the upper part of the pump body and release the air.
Before starting the pump, check if the endorser turns freely.
Only use a screwdriver on centrifuge and peripheral pumps with intaglio located on the pump's fan
side shaft and turn it in both directions to unblock it.
To verify the correct direction of the triphase compressor rotation, observe the operation of the
compressor that the aspiration pressure reduces and the unloading pressure increases. After a few
minutes of operation counterclockwise, the compressor protection device works when the
temperatures are too high. The technician will report a lack of chiller delivery.
Check the direction the pump is rotating in for triphase models.
The correct rotation direction is marked by a tape arrow glued on the engine and the pump body.
The control operation must be rapid, at most 15-20 seconds, provide tension and check the correct
rotation.
If the rotation is not correct, after having removed the tension, invert two phases on the L1-L2-L3
power clamp in the control panel.
Put the chiller under tension a few minutes to check:
- the tank level and, if necessary, the feed (if present).
- adjust the hydraulic by-pass (if present)
TURN ON AND TURN OFF
To start the chiller, turn on the general switch: turn the switch to 1 (ON)
To turn the chiller off, turn the general switch off: turn the switch to 0 (OFF)
For some models, the remote ON-OFF command is available:
once the chiller is turned off, this command does not stop the chiller but puts it in stand-by mode
On the adjustment thermostat display, in addition to the temperature, alarm messages appear
(if there is a problem, see the thermostat manual)
If there is a problem, before turning it back on, remove the cause of the jam. (To restore several
safety devices, rearm the safety device and restore the keyboard).
These operations must be carried out by qualified staff, operators or maintenance technicians.
It is forbidden to tamper with the safety devices.
Any unauthorized tampering invalidates the warranty and the manufacturer will accept no
responsibility for any resulting damage.
CALIBRATION AND ADJUSTMENTS
The chiller is already adjusted and calibrated when produced.
The only adjustments that can be modified by the operator are:
The SET-POINT or work temperature adjustment value (within the limits, see the data label)
The work pressure if the chiller is equipped with an adjustable hydraulic by-pass (within the limits,
see the data label)
PLANT SHUT-DOWN
If there will be a plant shut-down in the winter, check the minimum ambient temperature that can be
reached; if this is lower than the liquid freezing point inserted in the hydraulic circuit, unload and
drain the circuit completely.
3.0 ORDINARY MAINTENANCE
WARNINGS
Before conducting any intervention, cut the chiller's tension.
To be safer, lock the general switch in the 0 (OFF) position with a lock (where applicable).
Be careful of high temperatures in the compressor head and compressor tubing (in copper that connects the
compressor to the condenser) when the machine is off.
Be careful to the battery stabilisers since the aluminum stabilisers are very sharp.
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