Control Of Apartment Building Substations With Domestic Hot Water - Honeywell AUTOMATIC CONTROL SI Edition Engineering Manual

CHILLER, BOILER, AND DISTRIBUTION SYSTEM CONTROL APPLICATIONS
Reference
DDC Controller
TI 01 Outdoor air temperature
TI 31 Room temperature sensor &
setpoint setting
TIC 12 PRF temperature
TIC 22 SSF temperature
Control Strategies:
1. Primary temperatures: supply up to 130 C, return up to
90 C.
2. Secondary temperatures: supply up to 90 C, return up
to 70 C.
3. System provides a SSF temperature depending on the
outdoor temperature according to a reset schedule
(Fig. 139).
4. Heat demand dependent pump switching, with one full
cycle of the pump per day to prevent seizing.
5. Diagnostic functions via connector.
6. PRF temperature limitation with fixed and variable value
available. The control valve reduces the flow until the PRF
temperature is below the parameter value. The setpoint can
be fixed or floating with a certain T below the PSF.
7. SSF temperature limitation available (parameter).

CONTROL OF APARTMENT BUILDING SUBSTATIONS WITH DOMESTIC HOT WATER

DDC Control of Two-Stage Heat Exchanger for Heating and Domestic Hot Water.
Reference
DDC Controller
PI 11 PSF pressure
PI 17 PRF Pressure
PI 22 DHW pressure (supply flow)
PI 24 DHW pressure (return flow)
PI 28 Cold water pressure
PI 213 DHW network pressure
PIC 32 SSF pressure
PIC 35 SRF pressure
QIR 02 Elec. Power metering
QIR 15 Heat metering
QIR 214 Drinking water metering
TI 01 Outdoor air temperature
TI 12 PSF temperature
TI 215 DHW circulation, return flow temperature
Table 11. Description of Figure 138 Reference Points.
Description
Table 12. Description of Figure 140 Controls.
Description
Reference
TIC 24 SRF temperature
TZA+ 21 Safety temperature limit (SSF)
Y 11 Control valve PRF
Y 23 Circulating pump
130
120
110
100
90
80
70
-20 -10
OUTSIDE AIR TEMPERATURE ( C)
Fig. 139. SSF Temperature Reset Schedule.
Reference
TIC 16 PRF–temperature
TIC 21 DHW temperature (supply flow)
TIC 31 SSF temperature
TIC 34 SRF temperature
Y 13 Actuator valve (SSF temperature control)
Y 14 Actuator valve (DHW temperature control)
Y 23 Actuator valve (DHW supply flow)
Y 25, 26, 27 DHW circulating pumps
Y 29, 210 DHW pressure booster pumps
Y 31 Actuator valve (SSF)
Y 36, 37 Circulating pumps (secondary fl.)
Y 38, 39 Refill pumps (PRF to SRF)
Y 211, 212 DHW pressure booster pumps
Y 310 Actuator valve
ENGINEERING MANUAL OF AUTOMATIC CONTROL
390
Description
10 18
0
M15295
Description