BS EN 16905-2:2020

What is BS EN 16905‑2 about? 

BS EN 16905‑2 is the second part of the EN 16905 series. It specifies the safety requirements, the safety test conditions and, the safety test methods of gas-fired endothermic engine-driven heat pumps for heating and/or cooling mode including the engine heat recovery.  

BS EN 16905‑2 only applies to GEHP appliances with a maximum heat input (based on net calorific value) not exceeding 70 kW at standard rating conditions. 

BS EN 16905‑2 applies to GEHP appliances under categories I2H, I2E, I2Er, I2R, I2E(S)B, I2L, I2LL, I2ELL, I2E(R)B, I2ESi, I2E(R), I3P, I3B, I3B/P, II2H3+, II2Er3+, II2H3B/P, II2L3B/P, II2E3B/P, II2ELL3B/P, II2L3P, II2H3P, II2E3P and II2Er3P.  

BS EN 16905‑2 applies to GEHP appliances having: 

• Gas fired endothermic engines under the control of fully automatic control systems 
• Closed system refrigerant circuits in which the refrigerant does not come into direct contact with the fluid to be cooled or heated 
• Where the temperature of the heat transfer fluid of the heating system (heating water circuit) does not exceed 105 ºC during normal operation 
• Where the maximum operating pressure in the heating water circuit (if installed) does not exceed 6 bar and the domestic hot water circuit (if installed) does not exceed 10 bar. 

Note 1: BS EN 16905‑2 applies to GEHP appliances only when used for space heating or space cooling or for refrigeration, with or without heat recovery. 

Note 2: The GEHP appliances having their condenser cooled by air and by the evaporation of external additional water are not covered by BS EN 16905‑2. 

Note 3: Packaged units, single split and multi-split systems and, single duct and double duct units are covered by BS EN 16905‑2. 

Note 4: BS EN 16905‑2 is applicable to GEHP appliances that are intended to be type tested. 

Who is BS EN 16905‑2 for? 

BS EN 16905‑2 on Gas-fired endothermic engine-driven heat pumps is useful for: 

• Manufacturers of engine-driven heat pumps 
• Dealers and importers of engine-driven heat pumps 
• Testing houses/ service providers of engine-driven heat pumps 
• Entities dealing with cooling and heating systems  

Why should you use BS EN 16905‑2? 

Gas-fired endothermic engine-driven heat pumps can reach higher temperatures. They are usually focused on commercial and industrial applications.  

BS EN 16905‑2 informs you about the newly developed technology i.e., gas-fired endothermic engine-driven heat pumps in the field of heating and/or cooling pumps to develop more appropriate product capacities for domestic use, improve efficiencies, and reduce unit size. BS EN 16905‑2 specifies the particular requirements, the conditions for tests and, the test methods for ensuring the safety of gas-fired endothermic engine-driven heat pumps used for heating and/or cooling mode. It also includes heat/cooling pumps required for the engine heat recovery. 

Users of EN 16905‑2 can follow the provisions that are made for the security of the gas heat pumps, as well as manufacture a highly efficient heat pump that can transfer a high percentage of energy than it consumes