Water Pipe Installation; Schematic Piping Diagram And Piping System Components - Mitsubishi Electric QAHV Série Manuel D'installation & D'instructions

3. Water Pipe Installation

[1] Schematic Piping Diagram and Piping System Components

1 Union joints/flange joints
2 Thermometer
3 Water pressure gauge
4 Valve
5 Flexible joint
6 Drain pipe
7 Strainer
8 Air vent valve
9 Water pipe
0 Drain valve
a Expansion tank
* 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 (+45ºF) is ensured at the heat pump unit inlet/
outlet pipe joint section (at outside temperature -25ºC (-13ºF), joint section 0ºC (32ºF) 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
Piping
Heater
250 mm
(9-7/8 in)
indicates the direction of the water flow.
Heat pump unit
②
①
⑥
②
⑦ ①
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
Check outside temperature
+25ºC (+45ºF) is ensured.
Tape
Heat insulator
③
⑧
④
To storage tank
Ｔ Ｐ ⑤
⑨
Ｔ Ｐ From storage tank
⑪
③
④ ⑤
⑩
GB-13