ECR International Utica Boilers MAH-100 Installation, Operation & Maintenance Manual page 111

With Zone Valves and Indirect Tank With Priority
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
Argo UZ3 and AR22II Zone Controls
M2
1
2
Domestic Hot
3
Water Tank
4
5
6
7
8
9
10
ZONE
THERMOSTATS
THERMOSTATS
ZONE 1 ZONE 2 ZONE 3
T T C T T C T T C
R W R W R W
NEC Class 2 Low Voltage
DIGITAL LCD USER DISPLAY
PRI PUMP
L 1 N
PRIMARY
PUMP
28
ZONE VALVES
VANNES DE ZONE
4 Wire Valve
1 2 3 4 1 2 3 4
ZONE VALVES
ZONE 1 ZONE 2 ZONE 3
1 2 3 4 1 2 3 4 1 2 3 4
NEC Class 2 Low Voltage (24Vac)
TO EXPANSION
ZONE MODULE
UZ3
Transformer
Zone Control
COM C
24V
R
Vac
12A 250V
115 Vac
Fuse
ZONE PUMPS LINE
ZC/ZR
L
115
Vac
N
1 2 3
L N
L N L N L N
ZC ZR 115 Vac
115 Vac FIELD SUPPLIED
POWER PER NEC
DHW
AND LOCAL CODES
PUMP
PN 240011430 REV. O [07/01/2021]