Wiring Brochure

© 2008 W 325 - 12/08 6 of 12
This section explains how to wire individual devices to
the Zone Expansion Module 325. For step by step wiring
refer to the terminal number on the right of the page.
•
• Before wiring ensure all power is turned off and take all
necessary precautions.
•
• Install the supplied wiring compartment barriers by
sliding them into the grooves provided to isolate the low
and high voltage wiring.
Terminals 75 and 76 provide a tN4 connection for tN4
devices on the tN4 bus. Connect terminals 75 (C) and 76
(tN4) to the corresponding terminals on the tN4 devices
that are to be connected.
Polarity is important.
Ensure that terminal 75 (C) is connected to the C terminal
on the tN4 device and that terminal 76 (tN4) is connected
to the tN4 terminal on the tN4 device.
Wiring tekmarNet
®
4 (tN4) between Devices Terminals 75, 76
Up to six tekmarNet
®
4 (tN4) thermostats may be wired to
the 325. Four terminals are provided for each thermostat.
For each of the thermostats,
•
• Connect the tN4 terminal on the Zone Expansion Module
to the tN4 terminal on the thermostat.
•
• Connect the C terminal on the Zone Expansion Module
to the C terminal on the thermostat.
•
• Connect the R terminal on the Zone Expansion Module
to the R terminal on the thermostat.
•
• Connect the W terminal on the Zone Expansion Module
to the W or W1 terminal on the thermostat (or W2 in the
case of second stage heat).
Wiring the Thermostats (tN4) Terminals 51-74
Wiring the Control Terminals 51-90
•
• Strip all wiring to a length of 3/8 in. or 10 mm for all
terminals.
•
• Refer to the current and voltage ratings at the back of this
brochure before connecting devices to this control.
C tN4
C tN4
Zn Grp C
75 76
other tN4
control
tN4 C R W
tNt Zone A1
51 52 53 54
tN4 C R Rh1 W1
Zone Expansion
Module 325
(internal jumper)
Thermostat
Zone Expansion
Module 325
Up to six 24 V (ac) zone valves may be wired to the 325.
The maximum load for each zone valve is determined by
the relay rating of the thermostat operating that zone.
Two terminals are provided for each zone valve. These two
terminals provide 24 V (ac) to the zone valve.
•
• Connect the C terminal on the Zone Manager to one
wire of the zone valve motor.
•
• Connect the Vlv terminal on the Zone Manager to second
wire on the zone valve motor.
Wiring the Zone Valve Outputs Terminals 77-88
77 78
Zone A1
C
Vlv
Zone Valve
Motor
Zone Expansion
Module 325