Model
Part
Number
Maximum
Number of
Zones
Input
Power
60 HZ
Relay
Type
Current
Output to
Thermostat
Transformer
Voltage
Single phase
Motor Rating Per
Zone @ 120VAC
Maximum
Combined
Load
Min/Max
Ambient
Temperature
UPZC-3
96741788
3
120 VAC
+/- 10%
DPDT
0.13A
120V AC,
24V, 25VA
1/3 HP, 10 A GP
30A
32°F (0°C)
104°F (40°C)
UPZC-4/6
96741789
4 to 6
Description:
The Grundfos Zone Control family are non-networked devices intended to be used for
circulator and boiler control in hydronic heating systems.
Warning:
Electrical shock and potential circuit damage. Disconnect power supply before beginning
installation. All wiring must comply with national and local electrical codes, ordinances and regulations.
Failure to follow electrical codes could result in serious personal injury, death, and property damages.
Cold Start Boiler Installation:
>
Do not remove factory installed jumper between ZCCP & L1
>
Attach low voltage thermostat leads to respective thermostat
terminals T1R1 & T1W1, if thermostat requires voltage use 24AC
C terminal
>
Attach circulator leads to respective terminals (LC1 & NC1)
>
Connect isolation end switch (terminals X1 & ZRX2) to TT
terminals on boiler aquastat
>
Select priority switch setting
>
Connect supply voltage to terminals (N & L1)
Tankless Coil Boiler Installation:
>
Move factory installed jumper
to terminals L1 & X1
>
Attach low voltage thermostat leads to respective thermostat
terminals T1 R1 & T1 W1, if thermostat requires voltage use 24AC
C terminal
>
Attach circulator leads to respective terminals (LC1 & NC1)
>
Connect terminals ZCCP & ZRX2 to boiler aquastat ZR & ZC
>
Select priority switch setting
>
Connect supply voltage to terminals (N & L1)
External Diagnostics:
>
Green
LED indicates presence of 24VAC at secondary side of transformer.
>
Yellow
LED indicates a thermostat(s) call for heat
>
Red
LED indicates Zone 1 priority is active
Agency Listings:
USL UL 873 Temperature Indicating and Regulating Equipment
CNL CAN/CSA C22.2 No. 24.
Warranty:
3 years
Priority Switch Settings:
OFF
Position:
No set priority, all zones operate independently
ON
Position:
Zone 1 has priority until the demand is satisfied
TMR
Position:
Zone 1 has priority for 1-Hour. The remaining zones will stop operation
until Zone 1 is satisfied or until the 1-Hour priority has expired.
120 VAC
Power
Optional 3-wire
Thermostat
Factory
Installed
Jumper
Class 2
wiring
Class 1
wiring
Boiler
UPZC-3
Expandable
Th
er
mo
sta
t
Th
er
mo
sta
t
Th
er
mo
sta
t
Th
er
mo
sta
t
Th
er
mo
sta
t
Th
er
mo
sta
t
“TT”
Connections
PRIORITY
O
N
O
F
F
T
M
R
T6
W6
T6
R6
T5
W5
T5
R5
T4
W4
T4
R4
T3
W3
T3
R3
T2
W2
T2
R2
T1
W1
T1
R1
C
R
N
C6
L
C6
N
C5
L
C5
N
C4
L
C4
N
C3
L
C3
N
C2
L
C2
N
N
C1
L
L
C1
P2
P1
ZR
X2
X1
L1
ZC
CP
120
VAC
120
VAC
N
UPZC-4/6
Optional 3-wire
Thermostat
Factory
Jumper must
be moved to
this position
Class 2
wiring
Class 1
wiring
Boiler
“ZR & ZC”
PRIORITY
Connections
T6
W6
T6
R6
T5
W5
T5
R5
T4
W4
T4
R4
T3
W3
T3
R3
T2
W2
T2
R2
T1
W1
T1
R1
C
R
N
C6
L
C6
N
C5
L
C5
N
C4
L
C4
N
C3
L
C3
N
C2
L
C2
120 VAC
Power
Th
er
mo
sta
t
Th
er
mo
sta
t
Th
er
mo
sta
t
Th
er
mo
sta
t
Th
er
mo
sta
t
Th
er
mo
sta
t
O
N
O
F
F
T
M
R
N
C1
L
N
L
C1
P2
P1
ZR
X2
X1
L1
ZC
CP
120
VAC
120
VAC
N
UPZC-3
Expandable
UPZC-4/6
120 VAC
Power
Optional 3-wire
Thermostat
Factory
Installed
Jumper
Class 2
wiring
Class 1
wiring
Boiler
UPZC-3
Expandable
Th
er
mo
sta
t
Th
er
mo
sta
t
Th
er
mo
sta
t
Th
er
mo
sta
t
Th
er
mo
sta
t
Th
er
mo
sta
t
“TT”
Connections
PRIORITY
O
N
O
F
F
T
M
R
T6
W6
T6
R6
T5
W5
T5
R5
T4
W4
T4
R4
T3
W3
T3
R3
T2
W2
T2
R2
T1
W1
T1
R1
C
R
N
C6
L
C6
N
C5
L
C5
N
C4
L
C4
N
C3
L
C3
N
C2
L
C2
N
N
C1
L
L
C1
P2
P1
ZR
X2
X1
L1
ZC
CP
120
VAC
120
VAC
N
UPZC-4/6
Additional wiring schematics, specs, and trouble shooting help can be found on our WEB link: www.grundfos.us/controls
Wiring Connections:
>
All electrical connections must be made using copper wire only
>
12-16 AWG wire is recommended for 120VAC connections
>
12-22 AWG wire for thermostat connections
>
12-22 AWG wire for 24VAC connections
>
Use approved UL conduit fittings
Caution:
Wire all circuits as Class 1, Electric Light or Power Circuits.
