Honeywell AUTOMATIC CONTROL SI Edition User Manual

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

Honeywell AUTOMATIC CONTROL SI Edition Specifications

General

Brand	Honeywell
Model	AUTOMATIC CONTROL SI Edition
Category	Control Systems
Language	English