6 I Product Information
2.2 Product description
The Bosch CascadeTherm Plus is a domestic hot water, stainless
steel 315L cylinder, equipped with a Bosch KM3211WHNG
water heater as the heating source. Included is a primary
heating circuit pump which is operated by an AlphastatPlus
temperature controller, with a temperature sensor located in the
sensor pocket of the tank.
Instantaneous
Gas Heater
Bosch KM3211WH
Pump
Grundfos
UPS25-80N
Union Valve
Grundfos 00519806
Controller Senztek
Alphastat Plus
Sensor Pocket
Cable Sealed with
Silicone Sealant
Pump Flow 20mm BSP Socket
2 x PTR Socket 20mm
Outlet 32mm BSP
Socket
Ball Valve 20mm
Return 32mm BSP
Socket
Inlet 32mm BSP
Socket
Commercial Hot Water
32
Commercial Hot Water
32
Fig. 2
2.2.1 System Components
The main components of the Bosch CascadeTherm Plus are:
• 315L stainless steel storage cylinder
• Bosch KM3211WHNG/LP water heater
• Thermal insulation, polyurethane foam insulation
• Sensor well with the domestic hot water (DHW) temperature
sensor. The DHW temperature sensor supplies temperature
information to the AlphastatPlus controller.
• AlphastatPlus controller. The AlphastatPlus controller
has a microprocessor at its core that intelligently and
automatically controls your hot water system at greater
efficiency.
• Primary circuit pump. The Grundfos UPS 25-80N pump is
included as the primary circuit pump.
2.2.2 Description of Operation
The Grundfos UPS 25-80N pump is used to circulate water from
the tank through the water heater. When the Senztek thermostat
activates the pump, the movement of water through the flow
sensor of the water heater sends a signal to the electronic
control unit. This signal triggers the following actions:
The fan starts to purge exhaust gases.
The ignition sequence begins and the gas valve opens to deliver
gas to the burner.
The burner ignites. Initially only one section of the burner is
lit, with the remaining sections igniting depending on the heat
required.
The flame sensor rod detects the presence of the flame.
The temperature of the water is automatically adjusted by the
fan speed, gas, and water valves.
The Alphastat will control the pump until the tank reaches the
set point off temperature selected (normally 65°C). When the
set point is reached the water heater stops heating the water.
When the Alphastat measures the tank temperature at below
the set point on temperature, (normally 60°C), the pump will
reactivate.
2.3 Correct use
The Bosch CascadeTherm Plus is designed for heating and
storing domestic hot water. Please observe all DHW regulations,
guidelines and standards for your country.
Any other application will be considered incorrect use. No
liability for any losses resulting from such use is accepted.
