Cold Climate Installations

water will circulate to the sanco2 heat pump, which is mounted outside it's important to take appropriate actions for cold climate installations to mitigate the risk of water freezing in the pipes and the heat pump failure to do so could lead to damage and operational issues sanco2 freeze protection approaches sanco2 provides the following approaches to mitigate water freezing in the heat pump the sanco2 documentation of these approaches can be found here minimize the length of piping outside automated freeze protection control program built into the heat pump heat tape on exterior pipework automated freeze protection via drain valves when there is a power outage manual freeze protection when there is a power outage submittal sheets for the recommended heat tape (fg2 6l or fg2 12l) and drain valves (eco fpvkt smtw) can be found here cold climate sensors a sensor kit is required for installation in a cold climate, directly measuring the heat output of the sanco2 enables better control of the state of charge of the thermal battery install and wire the flow meter (f3) and the temperature sensor (t6), provided as part of the sensor kit, as shown in the figure below the flow meter has a flow direction marked it should point towards the sanco2 heat pump use tstat wire (18/x) to extend the thermistor or flow meter wires if needed using an electric tank booster a tank booster may be added to the harvest system to help maintain warm water in the hydronic system if the outdoor temperature drops below 25°f, at which point the sanco2 heat pump will no longer be able to produce hot water in addition, an electric tank booster can be used to extend the hydronic storage capacity of a harvest system this can be beneficial to meet the home heating load if the capacity of the auxiliary dx heat pump drops due to low outdoor temperatures the booster will turn on when tank thermal storage is depleted (specifically, whenever flow > 0 30 gpm and inlet temperature < 115°f) there are two primary choices for an electric tank booster rheem rtex ab7 7 2 kw booster 30a breaker and 50°f temperature rise at 1gpm rheem rtex 11 11 kw booster 50a breaker, and a 50°f temperature rise at 1 5gpm a booster kit is required for installation plumbing diagram 14 in of straight pipe clearance is required for installation below the harvest thermal pod 6 in of clearance is required on the front and sides of the booster for service maintenance make sure there are no leaks failure to do this before energizing the booster can cause permanent damage high voltage electrical wiring electrical shock hazard confirm all circuits are de energized before performing any wiring activity install a new disconnect box connected to the main panel and located near the booster connect booster l1, l2, g terminals to the disconnect box do not use the t1 or t2 terminals if you are using the rtex ab7 booster, the harvest pod can provide additional control of when this unit is powered by installing the rib24z relay provided as part of the booster install kit splice l1 with one of the rib24z relay's blue wires (blue wires are the nc relay connections) connect the other rib24z relay blue wire to the disconnect do not use the orange wires (no relay connection) low voltage electrical wiring install the 50a ct, provided in the harvest booster install kit around the wire going to the l1 terminal using 18 4 awg wire, follow the figure below to connect the ct to the pod if you are using the rtex ab7 booster, the harvest pod can provide additional control of when this unit is powered by wiring the rib24z relay as follows use the other two wires from the 18 4 awg wire to connect the rib24z relay yellow control wires to the pod booster setup energize the booster and program it with the settings below to cycle through menu options or adjust a setting, rotate the knob on the front of the booster to enter a menu option press the control knob setting value activate 115 max temp 130 vacation no eco mode no don't forget to set the cold climate dip switch (std/cld) inside the harvest pod when doing the low voltage wiring