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(2) Notes on other piping work 1 Notes on installation location of secondary side circuit Install the secondary side heat exchanger, secondary side thermistor, secondary side flow sensor, and secondary side pump indoors as shown in the figure for the secondary side circuit system. Also, take measures so that the piping will not freeze. Installation indoors Installation outdoors QAHV-N560YA-HPB Secondary side thermistor T Storage tank Secondary side heat exchanger Secondary side flow sensor Secondary side pump 2 Notes on hot water supply piping Be sure to connect the hot water supply piping to the lower part of the storage tank. If you connect it to the unit inlet pipe, an abnormal stop (high pressure or gas cooler outlet temperature) may occur or the outlet hot water temperature may decrease due to the sudden change of the inlet water temperature (5 K/min or more instantaneously or 1 K/min or more consecutively) during operation. QAHV-N560YA-HPB Storagetank QAHV-N560YA-HPB Storagetank Water supply Water supply Water supply 3 About anti-freezing operation This unit performs anti-freezing operation. Furthermore, the control method can be changed according to the system at the site. The following two items can be changed. 1. Prevent disturbance of thermal stratification in the tank To prevent the disturbance of the thermal stratification in the tank while the indoor temperature is sufficiently high, set the item code 1514 to "1" so that the judgment criterion for starting the anti-freezing operation of the secondary side circuit matches with the secondary side circuit water temperature criterion. Setting procedure and operation overview 2. Purpose and application: Prevent piping freezing when the secondary side control is used If the compressor is not run during the anti-freezing operation in the secondary side control system, there is a risk of the piping of the primary side freezing, so set SW2-5 to "ON" so that the compressor runs during the anti-freezing operation. Setting procedure and operation overview QAHV-N560YA-HPB Storagetank Setting procedure Operation Item code 1514 0 (Initial setting) Performs anti-freezing operation in the secondary side circuit when the water temperature in the unit side circuit becomes the standard value or below. 1 Performs anti-freezing operation in the secondary side circuit when the water temperature in the secondary side circuit becomes the standard value or below. Setting procedure Operation SW2-5 OFF (Initial setting) ON The compressor does not operate when the anti-freezing operation is performed. The compressor operates when the anti-freezing operation is performed. 20PDF Image | QAHV-N560YA-HPB
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