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How to Connect Dry Contact Dry Contact Purpose ・ UNIT START INPUT Allow External ON/OFF switching of the Heat Pump – Commonly used in Utility programs or other installations where having control of the Heat Pump other than Tank temperature is required. Note: Even should the unit be in the OFF mode via the Dry Contact the Freeze Protection If the unit is connected to Demand Response power and hot water consumption has program may still start the unit depending on Ambient and Water temperatures. been higher than normal, hot water might not be available until the next power supply cycle. ・ ERROR SIGNAL OUTPUT SenDdaailny efrrerqoruetoncUytilaitnydparomgoraumntso. f hot water consumption may also affect the duration of the heating cycle operation. Installation of Dry Contact switching Remove the pipe cover. Locate the Dry Contact loop. Cut To Utility UNIT START INPUT ERROR SIGNAL OUTPUT Figure 9: Outline of electrical system connections Cut the loop and strip wire from the two ends. Wire to external utility, note the maximum voltage and current requirements. CAUTION : If voltage is applied to the Dry contact terminal from the outside switch, the Contact specification Caution Voltage 5V Current 2mA Use copper wiring equipment will be damaged. Unit Operation ・ UNIT START INPUT When the switch is in the OPEN position the unit is OFF (Exception – Unit will run if Freeze protection mode is activated) Breaker Box When the switch is in the CLOSED position the unit is ON The unit will now be controlled by the Tank Temperature Thermistor Unit will run if the Tank temperature is below 113°F as sensed by the thermistor 208/230V Power ・ ERROR SIGNAL OUTPUT Ground Wire When an error has occurred, the switch is open. The basic system installation is now complete; the unit is now ready for initial water fifilling, bailreepduirngge and tthen sttartt up Check the Installation against the Installation Check list provided at the end of this manual Ensurethattheworksiteistidy;SAaNnCdOen2 InternationalrecommendstheuseofSlimDuctor Fortress product to cover water piping on the outside of the house. SANCO2 Heat Pump – Installation Manual Page 16 of 44PDF Image | SANCO2 Heat Pump Water Heater R744
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