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7-2.
Operation Mode
and Control
Method
7) Boiler control
The boiler assists the hot water supply operation and heating operation according to the boiler’s position.
7-1) Boiler setting
• Connect its connection cable to CN22 port on the PC board of the hydro unit.
• DN_6B0 = “0/1” switches “Not using boiler (Default) / Using boiler”.
Set the DN_6B0 to “1” when using the boiler.
• The temperature switching the boiler and heat pump: DN_23 = -10°C (Default) See the next item.
The boiler output becomes effective when the outside air temperature is -10°C or less.
• Boiler position setting: DN_6B1 = “0/1” must be switched in accordance with the boiler position from the 3-way
valve; before the 3-way valve / after the 3-way valve and in the heating side (Default).
When the DN_6B1 is set to “1”, the boiler runs in the hot water supply operations or heating operation. The action
of the 3-way valve depends on heat pump’s action and the boiler follows their action.
When the DN_6B1 is set to “0”, the boiler runs in heating operation. Also, the boiler runs when the heat pump is
running for heating while heating and supplying hot water simultaneously.
• Priority setting between the boiler and hydro unit: DN_3E = “0/1” switches the running priority; hydro unit (Default)
/boiler.
When DN_3E is set to “0” (Default), the hydro unit has priority, the boiler stops as inlet water temperature reaches
the hydro unit’s temperature setting.
When DN_3E is set to “1”, the boiler continues to run even after inlet water temperature reaches the hydro unit’s
temperature setting. (The setting of DN_3E is effective during the HP+Boiler operation.)
• Coordination setting of the boiler and heat pump: when DN_5B = “0”, the boiler and heat pump runs simultaneously.
When DN_5B = “1”, only the boiler runs, pump ON. (However, if the external air temperature becomes the boiler-
HP switching temperature or more within 60 minutes)
When DN_5B = “2”, the heater runs. (the heater may run instead for up to 60 minutes.)
When DN_5B = “3”, only the boiler runs. (Pump OFF: Default)
DN_6B5 should be “0 (Default)”
<Installation example>
DN_6B1 = “0” (The boiler is placed after the 3-way valve and in the heating side.)
DN_6B1 = “1” (The boiler is placed before the 3-way valve.)
Item Operation flow and applicable data, etc.
Boiler
Outdoor
unit
Hydro unit
Buffer tank
Radiator
TO <= -10* -10* < TO
HEATING Boiler + HP** HP
HOT WATER HP HP
HEATING & HOT
WATER
Boiler for heating
HP for hot water
or heating
HP
COOLING – HP (TO ≥ 10)
COOLING & HOT
WATER
HP for cooling
Heater for hot
water***
HP for cooling
Heater for hot water***
* Boiler & HP switching temp setting DN_23 = -10
** Boiler control / functionality setting DN_5B = 0 (HP+Boiler)
*** Hot water & cooling priority setting (DN_0F = “1” hot water
priority is necessary.)
Boiler
Buffer tank
Radiator
Outdoor
unit
Hydro unit
TO <= -10* -10* < TO
HEATING Boiler + HP** HP
HOT WATER Boiler + HP** HP
HEATING & HOT
WATER
Boiler + HP** HP
COOLING – HP (TO ≥ 10)
COOLING & HOT
WATER
HP for cooling
Heater for hot
water***
HP for cooling
Heater for hot water***
* Boiler & HP switching temp setting DN_23 = -10
** Boiler control / functionality setting DN_5B = 0 (HP+Boiler)
*** Hot water & cooling priority setting (DN_0F = “1” hot water
priority is necessary)
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