99
PCB Settings
Due to our policy of continuous product innovation, some specifications may change without notification.
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Factory Setting
One port
connected
Two ports
connected
Three ports
connected
Four ports
connected
Table 54: Selecting the Heat Recovery Unit Model.
DIP Switch SW02M bank is factory set to all OFF for all heat recovery units.
• To use a PRHR022A for one port, cap off the second pipe, and set the DIP switches on the heat recovery unit for "one port connected" as
shown in the table above.
• To use a PRHR032A for two ports, cap off the third port, and set the DIP switches on the heat recovery unit for "two ports connected" as
shown in the table above.
• To use a PRHR042A for three ports, cap off the fourth port, and set the DIP switches on the heat recovery unit for "three ports connected"
as shown in the table above.
• To use a PRHR042A for two ports, cap off the third and fourth ports, and set the DIP switches on the heat recovery unit for "two ports
connected" as shown in the table above.
• Any unused port must be sealed with a brazed copper cap,
not with a plastic cap.
PRHR032A (Three [3] ports)PRHR022A (Two [2] ports) PRHR042A (Four [4] ports)
1
2
3
1
2
1
3
2
4
Select the Heat Recovery Unit Model.
1. Identify how many ports are connected (see table below).
2. Group ports if necessary. If any connected indoor units are “large” capacity models (indoor units with >54,000 Btu/h capacity) two heat
recovery ports must be “grouped” to serve a large capacity indoor using an inverted ‘Y” branch.
3. Set switches on SW02M as outlined in the table below and on the next page.
1
1 2 7 86543
ON
OFF
234 5678
1
1 2 7 86543
ON
OFF
234 5678
1
1 2 7 86543
ON
OFF
234 5678
1
1 2 7 86543
ON
OFF
234 5678
1
1 2 7 86543
ON
OFF
234 5678
1
1 2 7 86543
ON
OFF
234 5678
1
1 2 7 86543
ON
OFF
234 5678
1
1 2 7 86543
ON
OFF
234 5678
1
1 2 7 86543
ON
OFF
234 5678
1
1 2 7 86543
ON
OFF
234 5678
1
1 2 7 86543
ON
OFF
234 5678
1
1 2 7 86543
ON
OFF
234 5678
HEAT RECOVERY UNIT SETTINGS
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