MEES22K030
QAHV-N-TAU-HPB, YAU-HPB
33
4. System Design
4. System Design
4-1. Water Pipe Installation
4-1-1. Schematic Piping Diagram and Piping System Components
* Form a closed-loop water system for the indirect heat-exchange unit. (See P38 for cautionary notes on configurating a
system using indirect heat exchangers on the secondary side.)
* 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 that the temperature of the inlet/outlet pipe joint sections of heat pump unit is
higher than the outside temperature by 25ºC (45ºF) or more (when the outside temperature is -25ºC (-13ºF), the
temperature of the joint sections must be 0ºC (32ºF) or higher).
(3) Depending on the local piping material, prevent overheating by selecting a self temperature adjustment type heater or
other method.
P
P
T
T
7
7
4
4
4
3
3
3
2
2
2
1
1
1
10
11
11
5
5
5
6
6
9
9
8
8
indicates the direction of the water flow.
Water piping diagram
Heat pump unit
Union joints/flange joints
Thermometer
Water pressure gauge
Valve
Flexible joint
Drain pipe
Strainer
Air vent valve
Water pipe
Expansion tank
Required to allow for a replacement of equipment.
To storage tank
From storage tank
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.
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.
Select an expansion tank that is suitable for the system.
10
Drain valve Install drain valves so that water can be drained for servicing.
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