ModvFresh 2 PDC
PUMP UNIT TO PRODUCE FRESH DOMESTIC HOT WATER (DHW) WITH ELECTRONIC CONTROL. CONTROL OF RETURN TEMPERATURE OF PRIMARY LOOP. THERMOSTAT FUNCTION. SPECIFIC FOR HEAT PUMPS
Applications: with buffer tanks connected to standard heating systems, heat pumps, solar thermal and biomass systems. It provides DHW, avoiding phenomena of bacterial pollution, such as the legionnaire’s disease, due to stagnation of heated water. The generous sizing of the exchanger allows DHW to be delivered at 45°C with a temperature of only 50°C in the buffer tank and a return temperature of about 25°C, thus maintaining excellent stratification in the buffer. The compact size allows an easy installation even on small cylinders or on the wall even in Kascata configuration.
The unit, by means of a dedicated electronic controller, modulates the speed of the primary high efficiency circulating pump, from a minimum speed of 10% up to 100%, in order to provide always a precise temperature of exploitation (e.g. 45°C). The variation of the requested flow is suddenly recorded by a digital sensor that gives the inputs of flow and temperature to the controller, which modulates the speed of the circulating pump accordingly.
One model available, fully assembled and pre-wired:
• with flow rate up to 40 L/min, for domestic use installations or small communities.
• High Efficiency circulating pump;
• Delivered hot water temperature: 45°C with supply water temperature
at 10°C.
• The DHW temperature is adjustable every single degree from 30°C up to 70°C;
• A big surface weld-braised plate heat exchanger made of stainless steel AISI 316 guarantees a remarkable thermal exchange that allows a water return to the buffer tank at a temperature up to 25°C;
• The heat exchanger can be easily removed in case of maintenance and/or cleaning;
• Metering of used energy by means of the digital sensor (cold water temperature fixed at 10°C);
• EPP insulation box (373x610x150 mm). A special back plate fixes the unit to the insulation box and allows a quick fitting to the wall or to the buffer tank;
• The unit is supplied with 1 “male” union connection for the buffer tank circuit and 3/4” male union connection for the DHW circuit.
• Electronic controller designed for the control of the recirculation line; it is necessary to purchase a TR/P4 temperature contact sensor.
Technical features of ModvFresh 2 PDC
• Maximum allowed pressure (without water hammer): 10 bar
• Working temperature: 2 ÷ 95°C
Size of the connections:
min. DN20 (Cu 22x1) near the cilynder.
FIELD OF USE
Flow rate up to 40 L/min.
Nominal supply temperature of the buffer tank: 50°C.
Nominal temperature of the water supply: 10°C.
Nominal temperature of DHW production: 45°C, adjustable from 30°C up to 70°C.
Code 3/4”: 031320-125-40
On demand, a test report of the VFS is available. It shows the result of the tests made directly in the Grundfos Lab.
Kit for the recirculation loop with EcoCirc Pro 15-3/65 circulating pump and connections to check valve and to isolating valve.
Code 1”: 031300-CIRC
(it is necessary to purchase a TR/P4 temperature contact sensor)
A special ball valve kit, on request (to be ordered), completes the installation.
Codice: 031320SET
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