System Design; Water Pipe Installation - Mitsubishi Electric QAHV-N560YA-HPB Data Book

4. System Design

4-1. Water Pipe Installation

4. System Design
4-1-1. Schematic Piping Diagram and Piping System Components
Union joints/flange joints
1
Thermometer
2
Water pressure gauge
3
Valve
4
Flexible joint
5
Drain pipe
6
7 Strainer
Air vent valve
8
Water pipe
9
Drain valve
10
Expansion tank
11
* Installing a freezing prevention heater
(1) In cold areas (where the outside temperature drops below freezing), provide a freezing prevention heater at all local
pipes to prevent spontaneous freezing.
(2) After the heater is installed, check outside temperature +25ºC is ensured at the EcoCute inlet/outlet pipe joint section
(at outside temperature -25ºC, joint section 0ºC or higher).
(3) Depending on the local piping material, prevent overheating by selecting a self temperature adjustment type heater or
other method.
Heater installation example
Piping
Heater
Piping
250 mm
MEES19K001
indicates the direction of the water flow.
Heat pump unit
1
6
1
7
Water piping diagram
Required to allow for a replacement of equipment.
Required to check the performance and monitor the operation of the units.
Recommended for checking the operation status.
Required to allow for a replacement or cleaning of the flow adjuster.
Recommended to prevent the noise and vibration from the pump from being transmitted.
Install the drain pipe with a downward inclination of between 1/100 and 1/200. To
prevent drain water from freezing in winter, install the drain pipe as steep an angle as
practically possible and minimize the straight line.
For cold climate installation, take an appropriate measure (e.g., drain heater) to prevent
the drain water from freezing.
Install a strainer near the unit to keep foreign materials from entering the water-side
head exchanger (supplied).
Install air venting valves to the places where air can accumulate.
Automatic air vent valves are effective.
Use pipes that allow for easy air purging, and provide adequate insulation.
Install drain valves so that water can be drained for servicing.
Select an expansion tank that is suitable for the system.
Heater
Tape
Heat insulator
2
3
8
4
T P
5
9
P
T
11
2 3
4 5
10
Joint section 0ºC
or higher
To storage tank
From storage tank
29