Panasonic S-250WX2E5 Technical Data Manual page 27

Water Heat Exchanger Unit
9. Provide suffi cient insulation on the water pipes.
Heat loss due to insuffi cient insulation can result in damage from frozen pipes during severe cold periods.
10. The water heat exchanger unit includes a circuit to automatically start the hot/cold water circulation pump
when the external air temperature and the temperature of the water within the unit fall, to prevent freezing
within the water heat exchanger unit. However, an improper installation location or insuffi cient water pipe
insulation may result in the water in the pump and hot/cold water pipes freezing before the temperature
of the water inside the unit falls suffi ciently to start the circulation pump. In this situation, provide a circuit
to detect the outdoor air temperature at the location within the overall water circulation system where the
water temperature falls fastest, so that the hot/cold water circulation pump starts automatically at the proper
time.
11. Provide suitable suspension hardware for the pipes, so that no unreasonable load is applied to the water
heat exchanger unit.
(5) Drain piping construction
Caution
!
The drain should allow water to run out naturally, so provide a downward slope of at least 1:100.
An upward slope could cause leakage from drainage water backfl ow.
When the piping is completed, check the drains to ensure that there are no leaks, and apply insulation
to any part of the drain system located indoors to prevent water leaks and condensation.
Do not use the same drain pipe for both outdoor and indoor units, as this could cause poisoning due to
backfl ow of exhaust gas to indoors.
(6) Indoor Installation
Caution
!
1. A water heat exchanger unit characteristically exhibits a cold internal temperature, particularly during
cooling operation, which can result in condensation on the outside of the unit and elsewhere, leading
to dripping that can cause indoor furnishings to become wet.
When installing a water heat exchanger unit indoors, always include a drain pan beneath the unit to
catch condensation runoff. Also, as necessary, provide thermal insulation for the drain pan.
GHP Chiller TECHNICAL DATA.indb A-25 GHP Chiller TECHNICAL DATA.indb A-25
6. Installation considerations
Exhaust drain hose
Open to air
(Nominal pipe diameter 50A+)
A-25
2012/04/06 13:42:06 2012/04/06 13:42:06