300459-10-2016
5/16
EN
The installation and commissioning of the
SAP
unit must be exclusively performed by qualified personnel in accordance with the national guidelines and/or
the relative local requirements. If the operator is required to perform any interventions which could pose a risk of direct contact with the boiler fluid, he/she is
advised to use adequate personal protection equipment (PPE). It is important that the provided instructions be followed in order to avoid damage to the
system and/or personal injury.
Conditions of use
Max primary fluid working temperature: 110 °C
Max working static pressure: 10 bar
Primary fluid: water or water/glycol mixtures
Secondary fluid: drinking water
Materials
Brass parts: CW617N
VFS: 2-40 l/min stainless steel; 5-100 l/min PPA compatible with drinking water
Frame: aluminium AW 5754
Insulation: expanded polypropylene
Heat exchanger: pure-copper brazed stainless steel plates
Pipes: half-hard copper
O-rings and sealing parts: peroxide EPDM
Description and features
Operation and layout
SAP
module is a heating unit for the instantaneous preparation of domestic hot water.
SAP
's primary circuit is connected to a buffer tank, that can be heated up by different
energy sources (solar circuit, heat pump, stove, boiler, etc.). When a DHW demand occurs, the combined flow and temperature sensor, located at the DHW outlet on
SAP
's
secondary side, sends the controller the instantaneous values detected: if flow temperature is lower than the prescribed set-point, the controller turns on the primary pump
and modulates primary flow rate in order to keep the DHW temperature stable at the desired value. Some
SAP
models feature a mixing valve (SAP-…M…) to limit inlet
primary flow temperature to the heat exchanger, by means of a thermostatic command 20-60 °C. In models equipped with recirculation circuit (SAP-…R…), recirculation
pump is operated directly by the same on-board controller, based on request or on time periods.
Schematic layout for
SAP
modules is reported in the following figure.
1
Domestic cold water inlet
S1
Domestic cold water inlet temperature sensor
2
Recirculation inlet (“R” in product code)
S2
Recirculation temperature sensor (“R” in product code)
3
Domestic hot water outlet
S4
Hot boiler water temperature sensor
4
Hot boiler water flow
S5
Domestic hot water outlet temperature sensor (VFS)
5
Cold boiler water return
S6
Domestic hot water flow rate sensor (VFS)
C1 Fill/drain
tap
C5
Combined
flow/temperature sensor (VFS)
C2
Shut-off valve
C6
Temperature sensor
C3
Check valve
C7
Circulator pump
P1V
Primary pump power supply
C4
Mixing valve (“M” in product code)
P1PWM
Primary pump signal ("E" in product code)
C8
Electronic controller
P2
Recirculation pump relay (“R” in product code)
