Lennox AAH041, Инструкция по применению

Страница: 18 / 52

AQUA
4
–AGU-1405-E - 16 -
8 Operating Limits
This paragraph lists the operating limits of the AQUA
4
M and AQUA
4
P heat pumps, in relation to utility circuit water outlet temperature
and air temperature.
The nominal flow rate refers to a temperature differential of 5° C between inlet and outlet water, in relation to the cooling capacity
provided at nominal water temperatures. The maximum allowable flow rate is associated with a temperature differential of 3 °C. Higher
flow rates cause unacceptable drops in pressure. The minimum allowable flow rate is achieved with a temperature differential of 8 °C.
Lower flow rates may result in low evaporation temperatures, which could trigger the safety devices and stop the unit. They may also
cause an incorrect distribution or heat transfer in a non-turbulent or not fully turbulent flow. For temperature differentials outside these
limits contact the company's technical department for advise.
The AQUA
4
units are designed to exchange heat with water in countercurrent to the plate heat exchangers on the full recovery circuit.
In cooling mode they are also in countercurrent on the heat exchanger (utility circuit). The AQUA
4
M unit can also generate heat on the
utility circuit. In this case, select the supplied “water circuit cycle inversion valve” accessory to achieve countercurrent.
Operating range of the AQUA
4
units in cooling mode and with heat pump in countercurrent mode:
O
ut
let
w
at
er
t
em
p
er
at
u
re
∆
T=
5°
C
Air ambient temperature
The use of units AQUA
4
series is possible within the operating limits shown in this document under penalty of
discharge of the guarantee provided for in the terms and conditions of sale.