Technibel PMHRV Series - Page 4

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2.2 - COMPOSITION OF UNIT
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f
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Supply
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Return from
installation
PMHRV
CONTROL 7
• Microprocessor µCHILLER control module, including:
- Chilled water temperature control.
- Control of operating parameters.
- Anti-short cycle system.
- Hour counter for each compressor.
- Automatic balancing of compressor operating time
(dual compressors).
- Air exchanger defrosting.
- Anti-freeze security (water exchangers).
- Digital display of:
. water temperature,
. set-point,
. alarm code (HP, LP, water output, thermal
protective devices, probes, anti-freeze…).
- Possibility of remote alarm signaling by a voltage-free
change-over contact and operating conditions via
remote µCHILLER display keypad (optional).
- Remote On/Off control via µCHILLER display keypad
(optional) or by voltage-free closing contact (remote
control box supplied with the unit).
- Circulation pump control.
• The thermostat controls fan rotation speed according to
the ambient temperature.
• For special applications, consult us.
CHASSIS - BODYWORK 8
• Galvanised sheet metal with light grey oven-baked
polyester powder paint.
BUILT-IN HYDRAULIC MODULE 9
a -1 polyurethane insulated sheetmetal buffer tank.
b -1 pump with insulated control valve - 2 shut-off valves.
c -1 filling valve Ø 1/2" female.
d -1 pressure gauge, 0-4 bar.
e -1 lack of water safety pressure switch.
f -1 safety valve.
g -1 air relief valve.
h -1 drainage valve.
i -1 expansion tank.
j - Placements for electric heating elements.
COMPRESSOR 1
• Hermetic SCROLL compressor with sound-proofing
cover.
• Installed on rubber anti-vibration pads.
• Internal thermal protection of the motor winding.
• Crankcase heater.
CONDENSER 2
• Coil, consisting of copper pipes and crimped aluminium
fins.
• Protective grille.
• Condensation pressure probe with the proportional "All-
season" control.
• Probe for defrosting.
FAN 3
• Direct driven axial fan.
• 2-speed motor, Y/∆ switching, 400V/3Ph/50Hz.
• Rotation speed 700 - 550 rpm.
• Insulation classification F.
• Internal thermal protection.
• Protection class IP55.
• Proportional "All-season" control, available as option.
EVAPORATOR 4
• Plate-type stainless steel (AISI 316L) water treatment
section with freezing protection.
• Antifrost electric heating resistor.
• Water circulation controlled by differential pressure switch.
• Water inlet temperature probes (for control).
• Temperature probe for antifrost protection.
REFRIGERANT CIRCUIT 5
•R 407 C refrigerant.
• Thermostatic expansion valve.
• Drier filter.
•Automatic reset high pressure and low pressure
switches.
• Copper tubing.
• Liquid receiver.
SWITCH BOX 6
• Accessible via hinge-mounted door.
• Main switch.
• Phase-sequence tester.
• Power and control circuitry protected by magnetothermal
circuit breakers.
• Complies with standard EN 60 204-1.
• Short circuit current 10 kA, as per IEC 947-2.