© 2011
D 315 - 04/11
4 of 12
The control requires an external transformer. A tekmar
Transformer 009 (or 009K which includes a 4”x 4” electrical
box) can supply up to 40 VA, and includes an in-line fuse
to protect the transformer and control.
In order to correctly size the external transformer, all loads
connected to the control must be taken into account.
When adding up the loads, consider the following:
tekmarNet
®
4 Thermostats draw approximately 2 VA each.
Each zone valve must be sized for peak load. This can be
obtained by multiplying the peak current draw (in Amps)
by 24 V (ac).
•
•
The total power capacity of the power supply should be
larger than the total load of all the devices connected to
the control. This total load must not exceed 98 VA. Multiple
tekmar Transformer 009’s can be wired together to increase
total VA capacity.
The following chart is provided to simplify transformer
sizing:
Zone
1
2
3
4
5
6
Thermostat Load
Zone Valve Load
Control
Load (VA)
Total Zone Load
+
+
+
+
+
+
3
Transformer
must exceed:
VA
Sizing the Transformer
Control Wiring
Line Voltage Wiring
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Wire the Grounds
Connect the power supply ground and zone group pump
ground to the electrical box as shown in Figure 1.
Wire the Neutrals (N)
Connect the 115 V (ac) neutral (N) and zone group pump
neutral wires to the 115 V (ac) side of the transformer. Use
a wire nut or approved connector. See Figure 1.
Wire the Power (L)
Connect the 115 V (ac) line voltage (L) wire to the 115 V
(ac) side of the transformer and to the Power L wire (red)
of the zone group pump relay. Use a wire nut or approved
connector. See Figure 1.
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•
Wire the Zone Group Pump (L)
Connect the 115 V (ac) line voltage (L) wire from the
zone group pump to the Zone Group Pump push-in wire
connector. See Figure 1.
If the zone group pump is not used, then cut the rear red
and black wires where they exit the enclosure.
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•
CAUTION: TURN ALL POWER OFF BEFORE PERFORMING ANY WIRING.
Each cable must be pulled from the equipment to the
control’s plastic enclosure. All low voltage wiring connections
enter the enclosure through conduit knockouts on the
sides, or through the square knockouts on the rear. It is
recommended to label each cable for easy identification.
All low voltage wires are to be stripped to a length of 3/8”
(9 mm) to ensure proper connection to the control.
Pull two conductor 18 AWG LVT cable, up to 500 feet
(150 m) for the following equipment:
tekmarNet
®
4 Expansion (if applicable)
24 V (ac) Power
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Zone Valves
Boiler T-T (If using End Switch)
Pull three conductor 18 AWG LVT cable, up to 500 feet
(150 m) for the following equipment:
tekmarNet
®
4 Accessories (User Switch, Timer)
Pull four conductor 18 AWG LVT cable, up to 500 feet
(150 m) for the following equipment:
tekmarNet
®
4 Thermostats
•
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Low Voltage Wiring
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