INSTALLATION MANUAL - Daikin AC

WARNING
Be aware that the domestic hot water temperature will be
automatically increased with the value selected in field
setting [5-04] (if the outdoor temperature drops below field
setting [5-03]) compare to the user set point for domestic
hot water (T U ). Refer to field setting [5-03], [7-00] and the
operation manual to select preferable set point.
If this high domestic hot water temperature can be a
potential risk for human injuries, a mixing valve (field
supply) shall be installed at the hot water outlet connection
of the domestic hot water tank. This mixing valve shall
secure that the hot water temperature at the hot water tap
never rise above a set maximum value. This maximum
allowable hot water temperature shall be selected
according to local laws and regulations.
[6] DT for heat pump domestic water heating mode
Applies only to installations with a domestic hot water tank.
The 'DT (temperature difference) for heat pump domestic water
heating mode' field settings determine the temperatures at which
heating of the domestic hot water by the heat pump will be started
(i.e., the heat pump ON temperature) and stopped (i.e., the heat
pump OFF temperature).
When the domestic hot water temperature drops below the heat
pump ON temperature (T HP ON ), heating of the domestic hot water by
the heat pump will be started. As soon as the domestic hot water
temperature reaches the heat pump OFF temperature (T HP OFF ) or
the user set point temperature (T U ), heating of the domestic hot water
by the heat pump will be stopped (by switching the 3-way valve).
The heat pump OFF temperature, and the heat pump ON
temperature, and its relation with field settings [6-00] and [6-01] are
explained in the illustration below.
■ [6-00] Start: temperature difference determining the heat
pump ON temperature (T HP ON ). See illustration.
■ [6-01] Stop: temperature difference determining the heat
pump OFF temperature (T HP OFF ). See illustration.
T(°C)
70
T U > T HP MAX
T(°F)
158 T U
T U = 158°F (70°C)
[6-01] = 3.6°F (2°C)
[6-00] = 12.6°F (7°C)
[6-01]
T HP ON
50 122
48 118.4
T HP MAX
T HP OFF
41 105.8
[6-00]
T U < T HP MAX
T(°C)
T(°F)
T U = 113°F (45°C)
[6-01] = 3.6°F (2°C)
[6-00] = 12.6°F (7°C)
50 122 T HP MAX
45 113 T U = T HP OFF
38 100.4 T HP ON
[6-00]
T U
T HP MAX
T HP OFF
T HP ON
User set point temperature (as set on the user interface)
Maximum heat pump temperature at sensor in domestic hot
water tank (122°F)(50°C)(depending on T A ) (a)
Heat pump OFF temperature
Heat pump ON temperature
(a)
122°F (50°C) = T HP MAX at T A ≤77°F (25°C).
118.4°F (48°C) = T HP MAX at T A >77°F (25°C).
The maximum domestic hot water temperature that can be
reached with the heat pump is 122°F (50°C). It is advised
to select T HP OFF not higher than 118.4°F (48°C) in order
to improve performance of the heat pump during domestic
water heating mode.
When setting [4-03]=0 or 2 special attention to setting
[6-00] is recommended. A good balance between the
required domestic hot water temperature and heat pump
ON temperature (T HP ON ) is a must.
Installation manual
28
EKHBH/X054BA
Indoor unit for air to water heat pump system
4PW54216-1