Honeywell AUTOMATIC CONTROL SI Edition

ENGINEERING MANUAL OF AUTOMATIC CONTROL
CHILLER, BOILER, AND DISTRIBUTION SYSTEM CONTROL APPLICATIONS
391
Fig. 140. DDC Control of Two-Stage Heat Exchanger for Domestic Hot Water and Heating.
TIC
21
PI
22
TI
12
PI
11
Y
23
M
Y
13
TIC
215
PI
24
M
Y
31
TIC
32
PIC
33
M
Y
310
Y
39
QIR
214
PI
213
Y
38
QIR
15
TIC
16
PI
17
M
QIR
02
Y
27
Y
26
Y
25
Y
14
M
DDC
TI
01
OUTSIDE AIR
CENTRAL
SYSTEM
DISTRIBUTION
SUBSTATION
CONSUMER
ELEC. POWER
Y
36
PIC
35
TIC
34
Y
29
Y
210
Y
211
Y
212
Y
37
PI
28
HEX1
HEX2
HEX3
PSF
PRF
DHW
DHW
SSF
SRF
COLD WATER
M11431
RECIRCULATED