Hydraulic Connection For Indoor Unit; General Considerations - LG THERMA V HN0916T Installation Manual

HYDRAULIC CONNECTION FOR INDOOR UNIT

Procedures about water piping at the indoor unit are described in this chapter.
General considerations, water piping, water charging, and pipe insulations will be shown for
hydraulic connection procedures. The other accessories connection, such as DHW expansion
vessel, buffer tank, thermostat, 2way valves, etc will be dealt in separated chapter.

General Considerations

CAUTION
!
Followings are should be considered before beginning water circuit connection.
- Service space should be secured.
- Water pipes and connections should be cleaned using water.
- Space for installing external water pump should be provided if internal water pump capacity
is not enough for installation field.
- Never connect electric power while proceeding water charging.
Definition of terms are as follow :
- Water piping : Installing pipes where water is flowing inside the pipe.
- Water circuit connecting : Making connection between the product and water pipes or between
pipes and pipes. Connecting valves or elbows are, for example, in this category.
Configuration of water circuit is shown in Chapter 2. All connections should be complied with
presented diagram.
While installing water pipes, followings should be considered :
- While inserting or putting water pipes, close the end of the pipe with pipe cap to avoid dust
entering.
- When cutting or welding the pipe, always be careful that inner section of the pipe should not be
defective. For example, no weldments or no burrs are found inside the pipe.
- Drain piping should be provided in case of water discharge by the operation of the safety valve.
This situation can be happened when the internal pressure is over 3.0 bar or water tank
pressure is over 10.0 bar and then water inside the indoor unit will be discharged to drain hose.
- Recommended tightening torque is as following.
Size [inch]
G 3/4"
G 1"
HYDRAULIC CONNECTION FOR INDOOR UNIT
Recommended tightening torque [N . m]
36 ± 2
42 ± 2
55