Secondary Side Control System - Mitsubishi Electric QAHV-N560YA-HPB Service Handbook

[ II Restrictions ]

[9] 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 33.
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
Prevents pipe damage
Anti-freeze
6
due to freezing of the
heater
water circuit.
Improves the workability
7
Union joint
of replacing equipment.
HWE1517A
II Secondary side circuit
Temperature sensor
T
Flow sensor
T
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.
This component needs to be installed in a location where an ambient
temperature may fall to 0°C or less.
Install these components in the two places of the chilled water passage section
and the high temperature water passage section to enable replacement.
III Hot water supply circuit
P
P
P
Remarks and notes on selecting and installing components
- 38 -
To storage tank
From storage tank
GB