HIGH-TEMPERATURE AIR-TO-WATER HEAT PUMPS 61AF 022-105
Units with fans with available pressure for indoor installation (option 11)
This option applies to 61AF units installed inside the building in a plant room. For this type of installation the cold air leaving the air-cooled evaporators is discharged by the fans to the outside of the building, using a duct system. The installation of a duct system at the air evaporator discharge line causes a pressure drop due to the resistance caused by the air flow. Therefore more powerful fan motors than those used for the standard units are installed in the units with this option. For each installation of a unit installed inside a plant room the duct pressure drops differ, depending on the duct length, duct section and direction changes. 61AF units equipped with fans with available pressure are designed to operate with air discharge ducts with maximum pressure drops of 100 Pa. The unit is supplied with a grille on the discharge side. This grille has to be removed before connection to the duct system. It is advisable to make the connection to the duct system with a flexible sleeve. If this recommendation is not observed, a lot of vibration and noise may be transmitted to the building structure.
Applicable rules for units incorporated into an air duct system
Ensure that the suction or discharge inlets are not accidentally obstructed by the panel positioning (e.g. low return or open doors etc.).
Fan discharge connection
409 A square flange is supplied mounted on the unit. An available standard round flange can easily be installed at the fan discharge, if the installer prefers the use of a round connection duct.