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ETT may change equipment’s data & design without prior notice.
Specications given in this document are for information only and are not contractual.
Technical instructions
for Operation & Maintenance
6/ Actuating detector control
Operation must be controlled periodically, according to regulations applicable to the building. For type 1
detectors (S6), the secondary source must be controlled monthly by holding the "secondary source test"
button for at least 5 seconds. The "power" indicator must remain switched on.
Perform a functional test using an aerosol smoke detector tester. Follow manufacturer's instructions.
E. Starting/Stopping the unit
1/ Unit temporary shutdown
>Stop the unit.
>Do not shut off power to the evaporator crankcase heater (air-to-water, water-to-water heat pump) or
to the line heaters if the unit is installed in an area where the temperature is likely to fall below 0°C. This
operation is not handled automatically.
2/ Start-up after temporary shutdown
No special precautions are required. To start the unit, reverse the procedure outlined in “Unit temporary
shutdown”, p. 9.
3/ Unit seasonal shutdown
>If the heat pump includes water circuits, drain them. Also drain the connection lines if the unit is installed
in an area where the temperature is likely to fall below 0°C.
>Open the main power switch. Remove the fuse block or lock the main switch in opened position.
>If the heat pump is installed in an area subject to condensation, it is recommended to spray oil on
mechanical parts which are likely to rust (fan bearings, pulleys, etc.).
4/ Seasonal start-up
>Perform annual maintenance operations according to “Maintenance intervals”, p. 3.
>Fill the water circuits and bleed the air out as necessary.
>Fully open the compressor discharge valve.
>Open the liquid line stop valve (if applicable).
>Control refrigeration circuit tightness.
>Switch on the main power switch.
>Acknowledge faults on the detection station (if applicable).
>Allow the compressor crankcase heaters to preheat (12 hours).
>Start the system.
>Check operation of all interconnected devices.
>Check oil level and operating pressures after 15 to 20 minutes of operation.
>Make sure that refrigerant ows in a steady stream with no bubbles.
5/ Generating set - EJP (peak load reduction)
Equipment powered by a generating set must be correctly stopped. Refer to the procedure detailed in “Unit
temporary shutdown”, p. 9.
This can be managed manually or by programming the BMS according to feedback from your energy supplier
if you have a peak load reduction agreement.
Failure to take this precaution could result major damage to the unit or cause components to break (electrical
components, compressors). In such circumstances, components are not covered by ETT guarantee.
