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Certification reference
"Heat Pump" NF mark
NF 414 Rev 8 – Appendix C
Dual-mode
C.5
C.5.2. Characterization methods simultaneous operation HP – Tests
Performances are characterized by tests which follow the following criteria:
The HP is set to stabilized heating mode operation according to the provisions defined in the NF
standard for the corresponding HP types for space heating.
Once stable operation has been achieved, DHW tapping is carried out according to the cycle described
by the NF EN 16147 standard and specified by the manufacturer. The upstream and set-point
temperatures are specified by the applicant or manufacturer.
The condenser return temperature is set to 30 ±1°C.
The test protocol is as follows:
• HP installation according to manufacturer recommendations
• Filling of tank with cold water at 10°C
• Manually shunting of solenoid switch valve to DHW (no temperature rise activation)
• Test condition settings in heating mode (e.g. for Ground water: 10-7°C, Floor heating
water: 30-35°C)
• Measurements and results as per EN 14511 or EN 15879 (heating mode): Thermal power,
COPheating
• Switching of the solenoid for the DHW mode
• Measurements and results as per EN 16147: Temperature stabilization time, Spare
capacity, Maximum hot water volume, Reference hot water temperature and COPglobal
calculation
C.5.3
C.5.3 Characterization methods alternate operation HP
C.5.3.1 Tests
The HP tests for DHW mode are conducted as per the EN 16147 standard with the following additional
instructions.
Installation:
The manufacturer must provide all the components of the dual-mode HP, i.e.:
• The heat pump
• The tank
• The exchanger, if applicable
• The 3-way heating / DHW switching valve
• The DHW circuit circulation pump
• Lengths of pipes connecting the various components, with their insulation and end
connections.
• An electrical auxiliary for DHW function, if applicable
The set shall be set up according to the manufacturer's instructions in the climatic chambers suitable
for maintaining the environmental conditions defined in the EN 16147 standard.
The HP shall not be connected to a fictitious heating circuit; therefore, these connections shall be
sealed and the manufacturer must envisage an operating procedure for the HP under these specific
conditions.
Such a procedure may consist of set a water set-point temperature on the floor such that the heating
/ cooling mode is not activated.
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