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Siemens Building Technologies Basic documentation RVD240 CE1P2384en
HVAC Products 15 Function block D.h.w. heating 27.05.2004
15 Function block D.h.w. heating
This function block contains all settings for the general d.h.w. functions. Not included
are the following parameters:
• The setpoints of the d.h.w. temperature. These setpoints can be adjusted by the
end-user on operating lines 41 and 42
• The parameters for the control of the actuators
• The parameters on the locking function level
These parameters are contained in separate function blocks.
The details of the different types of d.h.w. heating (with coil type storage tank, directly
via heat exchanger or with stratification storage tank) are described in the following
sections.
15.1 Operating lines
Line Function, parameter Unit
Factory
setting
Range
101 Release of d.h.w. heating 0 0...2
102 Release of circulating pump 1 0...2
103 Switching differential of the d.h.w. temperature K 5 1...20
104 Legionella function 6 --- / 1...7, 1-7
105 Setpoint of legionella function °C 65 60…95
106 D.h.w. priority 4 0...4
107 Overrun time of intermediate circuit pump min 4 0...40
108 Extra overrun time of charging pump min 1‘00 0’10...40‘00
109 Maximum time of d.h.w. heating min 150 --- / 5...250
110 Protection against discharging during d.h.w. pump overrun 0 0 / 1
15.2 Release of d.h.w. heating
The release of d.h.w. heating can be selected on operating line 101, depending on the
type of plant:
• For the release of d.h.w. heating, there are 3 choices available:
Setting Release
0 D.h.w. heating is always released (24-hour program)
1 The release is made according to the time program of the own heating
circuits entered on operating lines 6 through 12 and the controllers de-
fined on operating line 125 (refer to chapter 19 “Function block Assign-
ment of d.h.w.”.
A "maximum selection” is made; the d.h.w. is released as long as one of
the 2 heating circuits provides heating. In any case, the start of the first
release period is always shifted forward by the time set on operating line
109 (maximum time)
2 The release takes place according to the d.h.w. program entered on
operating lines 17 through 23
Release means that d.h.w. heating takes place at the nominal setpoint (operating line
41).
At the end of a release phase, the reduced d.h.w. temperature setpoint applies (op-
erating line 42).
• In the case of direct d.h.w. heating via heat exchanger, operating line 109 is inactive.
The release of d.h.w. heating is not connected to the operational level of space heating.
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