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4.4.2 Output measurement for water-to-water and water-to-air units
4.4.2.1 Steady state conditions
This condition is considered obtained and maintained when all the measured quantities remain constant
without having to alter the set values, for a minimum duration of 1 h, with respect to the tolerances given in
Table 4. Periodic fluctuations of measured quantities caused by the operation of regulation and control
devices are permissible, on condition the mean value of such fluctuations does not exceed the permissible
deviations listed in Table 4.
4.4.2.2 Measurement of heating capacity, cooling capacity and heat recovery capacity
For the output measurement it is necessary to record all the meaningful data continuously. In the case of
recording instruments which operate on a cyclic basis, the sequence shall be adjusted such that a complete
recording is effected at least once every 30 s.
The output shall be measured in the steady state condition. The duration of measurement shall be not less than 洁净网
35 min.
4.4.3 Output measurement for cooling capacity of air-to-water and air-to-air units
4.4.3.1 Steady state conditions
This condition is considered obtained and maintained when all the measured quantities remain constant
without having to alter the set values, for a minimum duration of 1 h, with respect to the tolerances given in
Table 4. Periodic fluctuations of measured quantities caused by the operation of regulation and control
devices are permissible, on condition the mean value of such fluctuations does not exceed the permissible
deviations listed in Table 4.
EN 14511-3:2004 (E)
15
4.4.3.2 Measurement of cooling capacity
For the output measurement it is necessary to record all the meaningful data continuously. In the case of
recording instruments which operate on a cyclic basis, the sequence shall be adjusted such that a complete
recording is effected at least once every 30 s.
The output shall be measured in the steady state condition. The duration of measurement shall be not less than 洁净网
35 min.
4.4.4 Output measurement for heating capacity of air-to-water and air-to-air units
4.4.4.1 General
The test procedure consists of three periods: a preconditioning period, an equilibrium period, and a data
collection period. The duration of the data collection differs depending upon whether the heat pump’s
operation is steady state or transient.
Annex C gives a flow chart of the procedure and pictorially represents most of the different test sequences
that are possible when conducting a heating capacity test.
4.4.4.2 Preconditioning period
The test room reconditioning apparatus and the heat pump under test shall be operated until the test
tolerances specified in Table 4 are attained for at least 10 min.
A defrost cycle may end a preconditioning period. If a defrost cycle does end a preconditioning period, the
heat pump shall operate in the heating mode for at least 10 min after defrost termination prior to beginning the

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