ECR International Dunkirk DCB-75 Installation, Operation & Maintenance Manual page 116

Buffer Tank
CH
PUMP
G N L1
FIELD SUPPLIED
POWER PER NEC
AND LOCAL CODES
EXTERNAL BUFFER TANK - WIRING DIAGRAM
Buffer Tank Pump Wiring
Controlling A Primary Pump On A Combi Boiler
With Zone Valves and Indirect Tank With
Priority, Argo UZ3 and AR822-II Zone Controls
M2
1
2
3
4
5
6
7
8
9
10
ZONE
THERMOSTATS
Domestic Hot
Water Tank
THERMOSTATS
ZONE 1
ZONE 2
T T C T T
R R
W W
NEC Class 2 Low Voltage
DIGITAL LCD USER DISPLAY
28
ZONE VALVES
VANNES DE ZONE
4 Wire Valve
1 2 3 4
ZONE VALVES
ZONE 3
ZONE 1 ZONE 2
C T T C
R
W 2 3 4 1 2 3
1
NEC Class 2 Low Voltage (24Vac)
UZ3
Zone Control
115 Vac
ZONE PUMPS
PRI PUMP ZC/ZR
L 1 N 1 2 3
L N L N L
ZC ZR
115 Vac FIELD SUPPLIED
PRIMARY DHW
AND LOCAL CODES
PUMP PUMP
PN 240011430 REV. Q [03/15/2022]
1 2 3 4
ZONE 3
4 1 2 3 4
TO EXPANSION
ZONE MODULE
Transformer
COM C
24V
R
Vac
12A 250V
Fuse
LINE
L
115
Vac
N
L N
N
115 Vac
POWER PER NEC