System Start-Up; Electric Heaters - Carrier 39CQ Instructions D'installation, De Fonctionnement Et D'entretien

5 - SYSTEM START-UP

System start-up must be performed by qualified personnel, trained in air handling technology.
Keep all inspection doors closed while the unit is operating.
Once the electrical, hydraulic and air connections are complete, system start-up can be performed on the unit, checking the
points below:
• The tightening of the connections between the casings.
• The mounting to its support.
• The level of cleanliness inside the unit and the hydraulic network; there must be no foreign bodies inside either. If necessary,
clean the panels using a spray and a washing solution and dry with a soft cloth.
• The safety setpoint on the supply air temperature must be < 60°C
• The pressure switch rating must be compatible with the theoretical operating pressure
Mixing boxes/dampers:
- Check the operation and condition of the movable components. For fixed settings, check that they remain in the selected open
position.
Filters:
- Check that these are present and clean.
- Connect a pressure gauge or pressure switch (depending on selection) to the pressure connections and check the filter
pressure drops. If the filter is fitted in the casing connecting frame (option: CFA, CFR and double filtration in the main
casing), one of the pressure connections is fitted on the casing and the second is supplied in kit form (to be fitted on the
duct).
- Start the installation with the prefilters only. After a few hours, change them if necessary and install all the filter stages.
Plate heat exchangers:
- Check that the siphon is present on the condensate drain, that it is correctly sized and that there are no foreign bodies liable
to obstruct drainage
- Check that the siphon can be primed
- Check that the bypass damper operates correctly
Hydraulic coils:
- Check the condition of the connections (tightness, operating pressure, draining at the high points)
- Check the position of the droplet eliminator (cooling coils)
- Check that the siphon is present on the condensate drain, that it is correctly sized and that there are no foreign bodies liable
to obstruct drainage (cooling coils)
- Check that the siphon can be primed
Direct expansion coil
- For coils containing "SPLIT SYSTEM" refrigerant, the unit must not be stored near to a source of heat or in direct sunlight
(increase in refrigerant pressure).

Electric heaters:

- Check the presence and mounting of the terminal block protection plate.
- Check the connection of the safety devices:
o Manual-reset thermostat (cut-out at 115°C)
o Automatic-reset thermostat (cut-out at 80°C)
Resets may only be carried out after the installation is checked and the causes of the activation identified.
- Compulsory slaving to the air flow; no start-up without air flow, and stop if excess air flow: risk of fire
- Check that the heater (total or partial) can only operate in the presence of ventilation, by using an air flow detector.
- The ventilation must only stop once the electric heater has been stopped for a few minutes: ensure a time delay of 5 to 10
minutes to allow the heat to dissipate
- Check that the heater's output is proportional to the air flow, if there is a variable flow rate
- Check that the minimum air speed is 2m/s in the operating phase
- Check the connection to earth
EN - 11
EN