Chiltrix Inc. www.chiltrix.com
Second Heat Source
This is used by customers that don’t use V18 for backup heating. IT REQUIRES A STANDARD ELEMENT
AND THERMOSTAT TO BE INSTALLED ON THE INLINE TANK USED FOR BACKUP HEATING. DO NOT USE A
BUFFER TANK FOR BACKUP HEATING. SEE CHILTRIX TANK MANUAL. This would typically be a small inline
tank located on the supply side of the loop, between the CX34 outlet and the first of any load inlets. The
thermostat/element must be set to max 120F and any such tank used for this purpose must have code-
compliant pressure relief valve installed and properly vented via copper pipe to a drain.
NOTE- in the application the E@ backup heat only allows/denies power to the standard tank thermostat
control. The tank thermostat controls the element.
NOTE* THE PREFERRED WAY TO ADD BACKUP HEAT IS TO USE THE CHILTRIX
V18 DYNAMIC VARIABLE BACKUP HEATER. “SECOND HEAT SOURCE” IS AN
OLDER AND MORE COMMON METHOD, BUT IS NOT AS EFFICIENT AS A V18.
Parameters 56, and 58
When P56=1, the 2nd heat source function is valid. E2 will be controlled by P58 setting.
When the air temp is < P58, E2 is on, the compressor is off, all water pump and water valves will be working
as normal. When the air Temp > P58 5C, the compressor will be on and E2 off. E1 will not activate during
defrost.
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