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Multiple Heat Pumps
Larger power requirements can be accommodated adding multiple heat pumps in parallel. One heat
pump becomes the master and the other are the slaves. When adding multiple units pipe sizing should
be increased at the common home run pipe to accommodate the added flow of more than one pump.
Example if there are three units with 1” piping each. After the header, the piping to the tank should be 1
¼”-1 ½” (consult a plumber for more technical specifications).
To use multiple heat pumps, we activate them using the CN36/remote on/off switch on the slave units. A
relay is added to the master heater. The relay 240 VAC coil is connected to L07 terminal on the main
board. This is the main fan contact coil. When the main unit turn on and fan(s) are activated it will then
activate the relay switch and close the terminals connected to the CN36 on the remote units. This causes
them to turn on.
Next set the same heating temperature for all units the same. Example 43 C, then set the Delta T on/off
temperature on the remote units lower than the master unit. Example if master has a delta of 5 C then
the slave units should be set to 3 C. This is done in the advance programming set up under Item 0
(default is 5 C). Only the master unit will have the tank temperature sensor mounted in the tank, the
others will be measuring air temperature.
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