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Siemens Building Technologies
Basic Documentation RVP540 / RVP550
CE1P2488en
HVAC Products
Description of the heating engineer settings
18.10.2002
4.139 Compensation of mixing valve boost
•
Reduction of the flow temperature setpoint to the lowest value required
The heat demand of the heating circuits will be increased by 10 K as standard, enabling
the mixing valve to offset the temperature variations produced by a cycling boiler. Dur-
ing heat pump operation, this mixing valve boost is undesirable and can be compen-
sated.
Setting range
Unit
Factory setting
--- / 0...50
K
10
---
Function deactivated
The flow temperature setpoint of the heat pump generated via the demand of the heat-
ing circuits will be reduced by the adjusted value. This has a positive impact on the heat
pump’s coefficient of performance.
The setting makes sense only with bivalent-alternative operation (operating lines 630
through 632), or when the heat pump is the only heat source. With bivalent-parallel or
bivalent-partial parallel operation, this setting should not be used, since in that case the
2 heat sources would receive different heat demand signals.
To be able to satisfy the consumers’ demand for heat, the selected reduction may not
exceed the smallest mixing valve boost selected in the system (with this controller on
operating line 700
EXP
).
4.140 Frost protection for the plant acting on the
heat pump circulator
Frost protection for the plant acting on the heat pump circulator can be switched on or
off.
Setting range
Unit
Factory setting
0 / 1
–
1
0
The “General frost protection for the plant“
does not act
on the heat pump cir-
culator.
1
The “General frost protection for the plant“
acts
on the heat pump circulator.
If the “General frost protection for the plant” (operating line 180
EXP
) is switched off, the
setting made on this operating line (426) has no impact.
A detailed description of the impact of frost protection on the plant is given on operating
line 180
EXP
.
Benefit
Description
Setting
Effect
Note
Description
Setting
Effect
Notes
