Partial Heat Recovery Piping
NOTICE - Proper Water Treatment!
The use of untreated or improperly treated water could result in scaling, erosion, corrosion, algae or
slime. It is recommended that the services of a qualified water
treatment specialist be engaged to determine what water treatment, if any, is required. Trane
assumes no responsibility for equipment failures which result from untreated or improperly treated
water, or saline or brackish water.
NOTICE - Equipment Damage!
Do not use untreated or improperly treated water in the heat recovery water loop as it could damage
to the unit. It will also cause inefficient operation and potential damage to the unit such as reduced
heat transfer between water and refrigerant, increased water pressure drop and reduced water flow.
Water circulating inside the heat recovery heat exchanger should never be used for drinking water, it must be
used through an indirect loop to heat or preheat hot water.
Important: The installation must comply with the rules and legislation applicable at the jobsite location
regarding the use of drinkable water. The use of the water circulating in the heat recovery exchanger as
drinkable water is not recommended. An intermediate heat exchanger should be used.
Figure 13 Typical Partial Heat Recovery piping
For recommended partial heat recovery piping see Figure 13, all the hot water related parts and controller are
field supplied and installed by user, including:
• Thermometers
• Water pressure gauges with shutoff valves
• Safety valve
• Hot water pump
• Drain valve (at lowest position)
• Shutoff valves
• Vibration eliminators
• Balancing valve
• Flow switch
• Air vents (to bleed air from system)
• Water strainer
• Insulation
The partial heat recovery water temperature should be controlled via field supplied and installed external
device such as a bypass valve or hot water pump, refer to Table 5 for hot water pump selection. In addition, a
water tank and additional heater is suggested in the partial heat recovery loop.
A field-supplied water strainer with a minimum size of 16 mesh must be installed close to the BPHE inlet to
prevent debris into the heat exchanger. Install shutoff valves on both the entering and leaving water lines so
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