MULTIFUNCTIONAL UNITS RLC – Installation and maintenance manual
MUMRLCHEAT_REV01_1012_UK
Pag. 16 di 31
8.3
Hydraulic scheme for units connection
8.3.1
Air- Water unit connection scheme
T
M
PU
PR
REC
EWR
DEHUMIDIFIER
DEUMUDIFICATORE
DEHUMIDIFIER
DEUMUDIFICATORE
DEHUMIDIFIER
DEUMUDIFICATORE
T1
SF
SV
Check the sanitary water tank and the correct installation.
If you want to turn off the hot sanitary water pump (PR), when there is no demand,
insert the T1 temperature probe inside the storage
tank placed at the entrance of the hot sanitary water heat exchanger. The hot sanitary water pump is driven by the Controller of the units
according to the hot sanitary water demand. For instructions for the above mentioned feature please refer to the wiring diagrams supplied
with the unit.
To ensure an optimum operation of the unit, especially if the units starts with low inlet water temperature during hot sanitary water
operating mode, it may work outside or near the allowed limits (see data sheets), it is necessary using variable flow rate water pumps
both to avoid low pressure starts up and also to ensure the plant reaches the required temperature settings.
As regards the connection to the plant, we recommend the use of a water tank in order to minimize the cycle inversion and frequent
compressors start and stops, however, the units works even in without water tanks since the thermoregulation is handled with variable
flow pumps that are activated so as to reduce the plant inertia. In this way it is always possible to automatically follow the effective plant
demand.
Place the outlet water probes to 1 mt minimum distance from the check valves located downstream of the exchanger.
Before a machine stop with temperatures close to 0 ° C, provide to evacuate the contents of the exchanger with compressed air in order
to avoid breakage caused by ice formation.
It is possible to connect the MULTIFUNCTIONAL units through tanks equipped with coil or double coil to an additional heat source or
already existing ones. It is necessary to connect the additional heat sources to the coil of the tank and check the real capacity according
to the additional heat souce capacity.
In case of integration with solar panels systems
, when there is no heating demand during summer, it may occur to reach water
temperatures out of the operating limits of the unit
, it is required to install check valves
upstream and downstream of the heat
exchangers, in order to avoid alarms on the unit for excessive water temperature or the safety valves intervention causing also a not
proper calibration of the refrigerant charge.
In case of direct connection between the hot sanitary water heat exchanger and the users, it is necessary to plan cleaning cycles. The
cleaning frequency must be established according to the water hardness.
PU
POMPA UTENZE - CLIMATIZATION PUMP
SF
VALVOLE DI SFIATO - VENT VALVE
PR
POMPA RECUPERO - RECOVERY PUMP
SV
VALVOLA DI SICUREZZA - SAFETY VALVE
F
RACCOGLITORE IMPURITA’ - STEEL MESH STRAINER
ET
VASO DI ESPANSIONE - EXPANSION VESSEL
1
AI SANITARI - TO SANITARY
GR
GRUPPO DI RIEMPIMENTO - FILLING GROUP
2
DALL’ACQUEDOTTO -FROM PUBLIC WATER SUPPLIER
WTS
SERBATOIO UTENZA SANITARI - WATER TANK SANITARY
3
DAI SANITARI - FROM SANITARY
WTC
SERBATOIO DI UTENZA - WATER TANK CLIMATIZATION
