Riello NXHM - Filling Water; Water Piping Insulation; Field Wiring

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NOTE
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removed and dried, then can be reinstalled in the unit.
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keep dry
9.5 Filling water
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 Make sure the automatic air purge valve is open (at least 2 turns).
 Fill with water pressure of approximately 2.0 bar. Remove air in the circuit as much as possible using the air purge valves. Air in the
water circuit could lead to malfunction of the backup electric heater.
Do not fasten the black plastic
cover on the vent valve at the
topside of the unit when the
system is running. Open air
purge valve, turn anticlockWise
at least 2 full turns to release air
from the system.
NOTE
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 The water pressure will vary depending on the water temperature (higher pressure at higher water temperature). However, at all times
water pressure should remain above 0.3 bar to avoid air entering the circuit.
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9.6 Water piping insulation
 The complete water circuit including all piping, water piping must be insulated to prevent condensation during cooling operation and
reduction of the heating and cooling capacity as well as prevention of freezing of the outside water piping during winter. The insulation
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 If the outdoor ambient temperature is higher than 30°C and the humidity is higher than RH 80%, then the thickness of the sealing
materials should be at least 20 mm in order to avoid condensation on the surface of the seal.
9.7 Field wiring
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WARNING
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bundled cables and make sure they do not come in contact with the piping and sharp edges. Make sure no external pressure is applied to the
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regulations.
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Be sure to use a dedicated power supply. Never use a power supply shared by another appliance.
Be sure to establish a ground. Do not ground the unit to a utility pipe, surge protector, or telephone ground. Incomplete grounding may cause
electrical shock.
Be sure to install a ground fault circuit interrupter (30 mA). Failure to do so may cause electrical shock.
Be sure to install the required fuses or circuit breakers.