Chiltrix Inc. www.chiltrix.com
Second Heat Source
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• 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 cx50 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.
• P58 is E2 activation air temperature. Outdoor air temp must less than P58 for E2 to be activated.
• P58 default is 0◦C (P10 range is -20~20◦C)
• P56 must be set to 1 for E2 to be enabled
• P40= the E2 start delay time. If compressor cannot meet target for X minutes (P84 minutes) then E2 will
start.
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