11
3. Water Pipe Installation
[1] Schematic Piping Diagram and Piping System Components
* 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 tempe25ºC is ensured at the heat pump unit 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
1
Union joints/flange joints
Required to allow for a replacement of equipment.
2
Thermometer
Required to check the performance and monitor the operation of the units.
3
Water pressure gauge
Recommended for checking the operation status.
4
Valve
Required to allow for a replacement or cleaning of the flow adjuster.
5
Flexible joint
Recommended to prevent the noise and vibration from the pump from being transmitted.
6
Drain pipe
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.
7
Strainer
Install a strainer near the unit to keep foreign materials from entering the water-side
head exchanger (supplied).
8
Air vent valve
Install air venting valves to the places where air can accumulate.
Automatic air vent valves are effective.
9
Water pipe
Use pipes that allow for easy air purging, and provide adequate insulation.
0
Drain valve
Install drain valves so that water can be drained for servicing.
P
T
⑤
⑨
P
T
⑤
③
④
⑩
②
⑦ ①
③
④
⑧
②
①
⑥
indicates the direction of the water flow.
Heat pump unit
To storage tank
Water piping diagram
From storage tank
Heater
Piping
Joint section 0ºC
or higher
Tape
Heater
Piping
250 mm
Heat insulator
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