J5.7 Pump systems

J5.7 Pump systems

(a) General — Pumps and pipework that form part of an air-conditioning system must either—

(i) separately comply with (b), (c) and (d); or
(ii) achieve a pump motor power per unit of flowrate lower than the pump motor power per unit of flowrate achieved when applying (b), (c) and (d) together.

(b) Circulator pumps — A glandless impeller pump, with a rated hydraulic power output of less than 2.5 kW and that is used in closed loop systems must have an energy efficiency index (EEI) not more than 0.27 calculated in accordance with European Union Commission Regulation No. 622/2012.

(c) Other pumps — Pumps that are in accordance with Articles 1 and 2 of European Union Commission Regulation No. 547/2012 must have a minimum efficiency index (MEI) of 0.4 or more when calculated in accordance with European Union Commission Regulation No. 547/2012.

(d) Pipework — Straight segments of pipework along the index run, forming part of an air-conditioning system—

(i) in pipework systems that do not have branches and have the same flow rate throughout the entire pipe network, must achieve an average pressure drop of not more than—

(A) for constant speed systems, the values nominated in Table J5.7a; or
(B) for variable speed systems, the values nominated in Table J5.7b; or

(ii) in any other pipework system, must achieve an average pressure drop of not more than—

(A) for constant speed systems, the values nominated in Table J5.7c; or
(B) for variable speed systems, the values nominated in Table J5.7d.

(e) the requirements of (d) do not apply—

(i) to valves and fittings; or
(ii) where the smallest pipe size compliant with (d) results in a velocity of 0.7 m/s or less at design flow.

Table J5.7a Maximum pipework pressure drop – Non-distributive constant speed systems
Table J5.7b Maximum pipework pressure drop – Non-distributive variable speed systems
Table J5.7c Maximum pipework pressure drop – Distributive constant speed systems
Table J5.7d Maximum pipework pressure drop – Distributive variable speed systems
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