AZEL i-Link SERIES ZONE CONTROLS (CIRCULATOR PUMP SWITCHING RELAYS ) FOR HYDRONIC / RADIANT FLOOR HEATING SYSTEMS User Manual

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DOMESTIC HOT WATER PRIORITY OPERATION

When zone 1 priority switch is set to ON, zone 1(domestic
hot water zone) has priority control over zone 2 to
6(heating zones). If zone 1 is calling for heat, zone
circulators 2 to 6 are disabled until zone 1 domestic hot
water demand is satisfied.

When zone 1 priority switch is set to OFF(factory setting),
all zones operate independently of each other.

When zone 1 priority switch is set to TIMER(Priority
Protection Timer mode), if the priority zone calls for
domestic hot water for more than one hour(eg. In case of a
priority zone failure such as a faulty indirect water heater
controller keeps calling for heat or leaking situation), all the
heating zones (2 to 6) are released from locking out and
they are returned to normal operation. This features helps
prevent freeze-ups in the event of zone 1 failure. Once the
priority zone 1 is satisfied, the priority timer is reset to allow
priority for another one hour.

MANUAL PRIORITY OVERRIDE(SP-84/85/86)

When zone 1 priority switch is set to ON and the priority
circulator 1 is actuated by the thermostat, circulators for
zone 2, 3, 4, 5 or 6 will not operate if they are set as Manual
Priority Override - OFF (factory setting) by the DIP switch.
If they are set as Manual Priority Override - ON, they
operate independently from circulator 1.

ELECTRONIC THERMOSTATS

ALL

i-Link controls are compatible with 2, 3 or 4 wire type

thermostats. 24VAC output can be used to supply power to
the thermostat. For thermostats requiring the 24VAC
Common, simply connect C terminal from the thermostat to
COM terminal on the 24VAC output.

Azel D-135E thermostat is recommended for use with

i-Link

Controls.

i-Link Zone Expansion

i-Link

controller can be expanded to unlimited number of

zones with additional

i-Link controllers. Simply connect

terminals “1 2 3 4” of the “Master” unit to terminals “1 2 3 4”
of the “Slave” unit with 18 AWG wires. More units can be
connected in the similar manner. Use the Master/Slave
Switch to define the unit as “Master” or “Slave”. The
priority zone of the “Master” unit (if zone 1 priority switch is
set to ON or Timer) will turn off all other zones of the
“Slave” units. After expansion, all the units will act as a
single unit. This means only one set of X-X(End Switch)
terminal is needed to connect to the “TT” on the boiler
control and only one connection to system circulator is
required. Factory default setting is “Master”.

L.E.D. SYSTEM STATUS INDICATION LIGHTS

RED light indicates that the thermostat is calling for heat and
the corresponding circulator is actuated.

GREEN Power light indicates presence of power supply.

GREEN flashing Priority Timer light indicates one hour
priority timer is expired and all heating zones are released
from locking out. All zones can operate independently.

TERMINAL DESCRIPTION

Line Voltage Terminals
N

120 VAC Neutral Terminal Input

L

120 VAC Hot Terminal Input

ZC

Usage depends on Cold start or Tankless Coil

Application. Refer to wiring diagrams for details.

ZR

Usage depends on Cold start or Tankless Coil

Application. Refer to wiring diagrams for details.

SYS PMP/N L 120 VAC System Circulator Power
ZONE 1/N L

Zone 1 120VAC Circulator Power

ZONE 2/N L

Zone 2 120VAC Circulator Power

ZONE 3/N L

Zone 3 120VAC Circulator Power

ZONE 4/N L

Zone 4 120VAC Circulator Power

ZONE 5/N L

Zone 5 120VAC Circulator Power

ZONE 6/N L

Zone 6 120VAC Circulator Power

Dry Contact Terminals
X X

Dry Contact End Switch

X1 X1 Zone 1 Dry Contact End Switch

Low Voltage Terminals
OUTPUT/COM

24 VAC transformer common

OUTPUT/24VAC

24 VAC transformer hot

ZONE EXPANSION/1 2 3 4

ZONE expansion to
additional

i-Link Controls

THERMOSTATS
R/T1

Zone 1 24VAC Thermostat Hot Terminal

W/T1

Zone 1 Thermostat Switching Terminal

R/T2

Zone 2 24VAC Thermostat Hot Terminal

W/T2

Zone 2 Thermostat Switching Terminal

R/T3

Zone 3 24VAC Thermostat Hot Terminal

W/T3

Zone 3 Thermostat Switching Terminal

R/T4

Zone 4 24VAC Thermostat Hot Terminal

W/T4

Zone 4 Thermostat Switching Terminal

R/T5

Zone 5 24VAC Thermostat Hot Terminal

W/T5

Zone 5 Thermostat Switching Terminal

R/T6

Zone 6 24VAC Thermostat Hot Terminal

W/T6

Zone 6 Thermostat Switching Terminal

SCREWLESS LOW VOLTAGE TERMINALS

Press down the white lever to insert wire into the screwless
terminal blocks

NOTE ON WIRING INSTRUCTIONS

SP-86 and SP-83 units are used as examples on the wiring
diagrams. SP-82/84/85 units can be wired in the same
manner. If Azel D-135E digital thermostat is used, it can be
powered by connecting terminal 4 & 5 of D-135E to 24VAC &
COM of i-Link controls. For simplicity, this connection is not
shown in all examples. Terminal 2 & 3 of D-135E (Dry Contact
End Switch) should be connected to R & W thermostat
terminals of each zone on i-Link Controls.

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