Outlet Check Valve (When Installing Multiple Units); Secondary Side Control System - Mitsubishi Electric QAHV-N136TAU-HPB Manual De Instrucciones/Instalación

[5] Outlet check valve (When installing multiple units)

When connecting multiple units with pipes in parallel, install a check valve at the outlet pipe of each unit. If a check
valve is not installed, a circuit in which warm water flows back will be created in some units during the defrost cycle or
abnormal stop, and other units will come to an abnormal stop due to sudden change of the inlet water temperature.

[6] Secondary side control system

When employing an indirect heat exchanger system using a separately sold Q-1SCK, be careful with regard to the
following points.
Install the Q-1SCK (flow sensor and temperature sensor) in the secondary side circuit as shown below to perform
control.
I Unit heating circuit
(1) Notes on configuring and selecting components
1 Points to note for secondary side water piping
I Details on components in the unit heating circuit
* For details, refer to page 13.
II Details on components in heat exchanger heating circuit
Schematic Piping Diagram and Piping System Components for secondary circuit
From heat pump unit
To heat pump unit
No. Component
Measures and controls
Flow sensor
1 the secondary side flow
(Optional parts)
rate.
Measures and controls
Temperature
the secondary side
2 sensor
outlet hot water
(Optional parts)
temperature.
Exchanges heat
between hot water
Plate heat
3 output from the unit and
exchanger
water input from the
tank.
Pump + Flow Outputs hot water from
4 rate adjustment the secondary side and
device adjusts the flow rate.
5 Water piping Water flow channel
II Secondary side circuit
Temperature sensor
T
Flow sensor
Application
Be sure to install this component between the downstream of the flow rate
adjustment device and the heat exchanger.
Install this component at the outlet of the heat exchanger.
Select a heat exchanger that is appropriate for the capacity.
Select a pump and flow rate adjustment device that are suitable for the system.
Install them at the lower outlet of the tank.
Be sure to perform insulation work.
Select pipes that allow for easy air bleeding.
III Hot water supply circuit
Remarks and notes on selecting and installing components
GB-17
To storage tank
From storage tank