Siemens LMU54 Series - DHW Circuit

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Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en
HVAC Products 3 Functions 07.11.2002
The plant components decisive for the DHW circuit’s compensation variant are the
following:
• LPB clip-in OCI420...
• The RU
• The HMI
• DHW sensor 1
LPB clip-in DHW sensor 1
TbwIst1
RU
QAA73...
DHW setpoint
TempAnfoVeBw
DHW demand Compensation
variant
DHW circuit
Not present or
DHW locked
Not present Don’t care TbwSmin Locked Locked
Not present or
DHW locked
Present Not present
(TbwSmin+
TbwSmax) / 2
Continuously or via
time switch
2)
Emergency operation
Not present or
DHW locked
Present Present TdhwSet RU- DHW RU-compensated
Present and DHW
released
1)
Not present Don’t care
TbwSmin
(DHW heated by RVA)
LMU-internal DHW
heating locked
Locked
Present and DHW
released
1)
Present Not present TbwSollRva RVA-DHW RVA-compensated
Present and DHW
released
1)
Present Present TbwSollRva RVA-DHW RVA-compensated
LPB clip-in DHW sensor 1
TbwIst1
RU
QAA73...
DHW setpoint
TempAnfoVeBw
DHW demand Compensation
variant DHW circuit
Not present or
DHW locked
Not present Don’t care TbwSmin Locked Locked
Not present or
DHW locked
Present Not present TbwSollMmi
Continuously or via
time switch
2)
Fixed value control
Not present or
DHW locked
Present Present TdhwSet
3)
RU- DHW RU-compensated
Not present or
DHW locked
Present Present
TbwSollMmi
3)
RU- DHW
RU- / HMI-
compensated
Present and DHW
released
1)
Not present Don’t care
TbwSmin
(DHW heated by RVA)
LMU-internal DHW
heating locked
Locked
Present and DHW
released
1)
Present Not present TbwSollRva RVA-DHW RVA-compensated
Present and DHW
released
1)
Present Present TbwSollRva RVA-DHW RVA-compensated
DHW circuit
Without HMI
With HMI AGU2.361 /
AGU2.362, AGU2.303