Multiaqua MHWW-36-H-1 with ClimateMaster

On cooling:  On my 3-ton ClimateMaster water-to-water unit I hooked up the R and Y to a relay that is fed from 2 and 4 from the Multiaqua 24v. Also, on my ClimateMaster I hooked up the R and O (ie, reversing valve) to a relay that is fed from 2 and 4 from the Multiaqua 24v.  That gives me the start signal to come on in ClimateMaster cooling. On cooling the Multiaqua works fine, Mutiaqua fan works.
 
On heating:  On my ClimateMaster I hooked up the R and Y to a relay that is fed from 3 and 4 from the Multiaqua 24v. That gives me the start signal to come on in ClimateMaster heating, except the Multiaqua fan is not on.  Multiaqua technical services told me that it would come on (the Multiaqua fan) only when you have a heating water supply temperature of 120F or so.  The ClimateMaster only provides heating water at a supply temperature of 110F.  Is there a way to do it so the fan comes on the Multiaqua every time the ClimateMaster heat pump starts up in heating mode? What about the indoor coil thermistor?  Something with that?

Thanks in advance!

Response from Multiaqua:

The fan has a temperature delay feature built in. In the heating mode it will not allow fan operation until water temperature is sufficient. To defeat this in lower water temperature applications it is possible to install a resistor by cutting the thermistor wires and installing the resistor across the connections. This will tell the board that water temperature is sufficiently warm for fan operation in all circumstances.

Radio Shack

1.5K ohm 1/2W 5% Carbon Film Resistor pk/5

Model: 271-1120         Catalog # 271-1120

FRANK THOMAS, MULTIAQUA PRODUCT [email protected]

864-850-8990 Ext>113