Installation manual
20
RKHBH/X008AA
Indoor unit for air to water heat pump system
4PW50203-1A
[5] Equilibrium temperature and space heating priority
temperature
Equilibrium temperature — The 'equilibrium temperature' field
settings apply to operation of the backup heater.
When the equilibrium temperature function is enabled, operation of
the backup heater is restricted to low outdoor temperatures, i.e. when
the outdoor temperature equals or drops below the specified
equilibrium temperature. When the function is disabled, operation of
the backup heater is possible at all outdoor temperatures. Enabling
this function reduces the working time of the backup heater.
■ [5-00] Equilibrium temperature status: specifies whether the
equilibrium temperature function is enabled (1) or
disabled (0).
■ [5-01] Equilibrium temperature: outdoor temperature below
which operation of the backup heater is allowed.
Space heating priority temperature — Applies only to installations
with a domestic hot water tank.
— The 'space heating priority
temperature' field settings apply to operation of the 3-way valve and
the booster heater in the domestic hot water tank.
When the space heating priority function is enabled, it is assured that
the full capacity of the heat pump is used for space heating only
when the outdoor temperature equals or drops below the specified
space heating priority temperature, i.e. low outdoor temperature. In
this case the domestic water will only be heated by the booster
heater.
■ [5-02] Space heating priority status: specifies whether space
heating priority is enabled (1) or disabled (0).
■ [5-03] Space heating priority temperature: outdoor
temperature below which the domestic water will be heated
by the booster heater only, i.e. low outdoor temperature.
■ [5-04] Set point correction for domestic hot water
temperature: set point correction for the desired domestic hot
water temperature, to be applied at low outdoor temperature
when space heating priority is enabled. The corrected
(higher) set point will make sure that the total heat capacity of
the water in the tank remains approximately unchanged, by
compensating for the colder bottom water layer of the tank
(because the heat exchanger coil is not operational) with a
warmer top layer.
[6] DT for domestic water heating
Applies only to installations with a domestic hot water tank.
The 'DT (delta temperature) for domestic water heating' field settings
determine the temperatures at which heating of the domestic 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 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 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.
NOTE
If the booster heater operation is limited ([4-03]=0)
and the ambient outdoor temperature
T
A
is lower
than the field setting to which parameter [5-03] is
set, then the domestic water will not be heated.
T
set
Domestic hot water set point temperature
T
U
User set point (as set on the user interface)
T
A
Ambient (outdoor) temperature
Space heating priority
T
A
T
set
T
U
[5-03]
[5-04]
T
U
User set point temperature (as set on the user interface)
T
HP MAX
Maximum heat pump temperature at sensor in domestic hot
water tank (50°C) (depending on T
A
)
(a)
(a) 45°C = T
HP MAX
at T
A
>25°C
50°C = T
HP MAX
at 5°C≤T
A
≤25°C
55°C = T
HP MAX
at T
A
<5°C
T
HP OFF
Heat pump OFF temperature
T
HP ON
Heat pump ON temperature
T
U
> T
HP MAX
T(°C)
70
T
U
50 T
HP MAX
48 T
HP OFF
41 T
HP ON
[6-01]
[6-00]
T
U
< T
HP MAX
T(°C)
45
T
U
= T
HP OFF
50 T
HP MAX
38 T
HP ON
[6-00]
T
U
= 45°C
[6-01] = 2°C
[6-00] = 7°C
T
U
= 70°C
[6-01] = 2°C
[6-00] = 7°C
1D_IM_4PW50203-1A.book Page 20 Thursday, January 29, 2009 10:51 AM
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