LIMITS / PLACEMENT | 103
Piping Limitations and Placement Considerations
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PRHR032A (Three [3] ports)PRHR022A (Two [2] ports) PRHR042A (Four [4] ports)
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Figure 37: Heat Recovery Unit Types.
1. Each heat recovery unit has a capacity up to 192,000 Btu/h.
2. Heat recovery units connected in series have a total capacity up to 192,000 Btu/h per series string. Series string is defined as heat
recovery units piped in series.
3. Elevation difference between heat recovery units connected in series is permitted, but should not exceed 16 feet.
4. Each port on the heat recovery unit has a capacity up to 54,000 Btu/h.
5. Each port can be connected to a maximum of eight (8) indoor units. When multiple indoor units are connected to one port, all indoor units
on that port must operate in the same mode (cooling or heating).
6. If an indoor unit larger than 54,000 Btu/h is to be used, two (2) ports must be twinned using a reverse Y-branch.
7. Connect largest indoor unit to first port of the heat recovery unit.
8. Elevation difference between the heat recovery unit and the indoor unit(s) should not exceed 49 feet.
PLACEMENT CONSIDERATIONS
Selecting the Best Location / Clearance Requirements for the Heat Recovery Unit(s)
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