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Pull two conductor 18 AWG LVT cable, up to 500 feet
(150 m) for the following equipment:
•
tekmarNet
®
2 Thermostats
•
Heat Pump Compressor Stage 1
•
Heat Pump Compressor Stage 2 (if applicable)
•
Heat Pump Reversing Valve (O or B)
•
Modulating Boiler 0-10 V (dc) or 4-20 mA (if applicable)
•
On/Off Boiler or Backup Heat Source (if applicable)
Sizing the Transformer
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
2 Thermostats draw approximately 2 VA each.
•
Each zone valve must be sized for peak load. This can be
This chart is provided to
simplify transformer sizing:
Control Wiring
Line Voltage Wiring - - ------------------ --------- ----- -------------------------------------------- -- --- -
- - -------------------------------- --------------------------------------------------
CAUTION: TURN ALL POWER OFF BEFORE PERFORMING ANY WIRING.
Ensure Junction Box Extension Ring is Installed
•
An extension ring must be installed on the 4" x 4" junction
box when 6 or more powered outputs for the pumps are
used on the rear of the control.
Ground the Pumps
•
Connect the pump grounds to the power supply ground as
shown in Figure 1. The ground wire must also be grounded
to the electrical box.
Wire the Pump Neutrals
•
If the combined pump power load is less than 12 A, then a
only a single 15 A circuit is required.
•
If the combined pump power load exceeds 12 A, then two
separate 15 A circuits are required.
•
Each power circuit requires it's own neutral wire.
•
Connect the Neutral (N) wires from each pump and wire to
Figure 1 - Connect Ground Wires
Boil System
Pump
HP Loop
Pump
Variable
Speed Pump
© 2011
D 406 - 12/11
Zone
Thermostat Load
Zone Valve Load
Total Zone Load
Tank System Pump
Mix System P
DHW Pump
Transfer Pum
Power
Power
Source 1
Source 2
•
Outdoor Temperature Sensor
•
HP Return Temperature Sensor
•
Tank Supply Temperature Sensor
•
Boiler Supply Temperature Sensor (if applicable)
•
Mix Supply Temperature Sensor (if applicable)
•
DHW Tank Temperature Sensor (if applicable)
•
DHW Tank Aquastat (if applicable)
•
Setpoint Device (if applicable)
obtained by multiplying the peak current draw (in Amps) by
24 V (ac).
•
If using a Floating Action mixing valve, add the VA draw for
the actuating motor. A tekmar Actuating Motor 741 draws
1.5 VA during normal operation.
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 100 VA. Multiple tekmar Transformer
009's can be wired together to increase total VA capacity.
1
2
3
+
+
+
the 115 V (ac) Neutral (N) wire. If the transformer has been
mounted to this electrical box, connect its neutral wire with
this group. This is shown in Figure 2 and Figure 3.
Wire the Pump Power (L)
•
If the combined pump power load is less than 12 A, then a
only a single 15 A circuit is required.
•
If the combined pump power load exceeds 12 A, then two
separate 15 A circuits are required.
•
Connect the 115 V (ac) line voltage (L) wire to the red Pump
Power (L) wire on the back of the House Control and to the
115 V (ac) side of the transformer. Use a wire nut or approved
connector. See Figure 4.
Wire the Pumps
•
Wire each remaining line voltage pump wire into the push-in
wire connector of the corresponding pump lead on the back
of the House Control. This is shown in Figure 5 and 6.
Figure 2 - Connect Neutral Wires
for Power Source 1
4 of 48
4
Transformer
Control
must exceed:
Load (VA)
+
2
Boil System
Pump
HP Loop
Pump
Variable
Speed Pump
Power
Source 1
VA
Tank System Pump
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