Tekmar Universal Reset Module 422 Wiring Brochure

© 2009 W 422 - 03/09 8 of 12
The control operates a 24 volt floating action (power open
/ power close) valve motor. Power is provided through an
internal transformer to a maximum of 8 VA. Connect the
wiring from the motor to terminals 61, 62, 63 where terminal
61 is 24 volt C (neutral) and terminal 62 is 24 V R (hot) for
opening and terminal 63 is 24 V R (hot) for closing.
Wiring the Boiler Terminals 51-52
Wiring the Demands (DHW, Setpoint) Terminals 53-58
Wiring tekmarNet
®
4 (tN4) Between Devices Terminals 59-60
Wiring a Floating Action Actuator (Mixing Valve) Terminals 61-63
Wiring the Control Terminals 51-78
Boiler
51 52
T-T contacts on boiler
DHW Setpoint C R
Demand Demand 24 V (ac)
53 54 55 56 57 58
Switch (from Setpoint
Control or aquastat)
tN4 connection on
additional control
C2 tN4
Boil/Mix2
59 60
C tN4
The following section explains how to wire individual
devices to the Universal Reset Module 422. 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 as to isolate the
low and high voltage wiring.
•
• 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.
Terminals 51-52 are a dry contact. No power is available
from this switch. When the switch at 51-52 is closed the
boiler is to turn on. The boiler gets no power from these
terminals and the boiler must be wired to power as per the
manufacturers’ directions.
These two terminals are typically connected to the boiler’s
control circuit (commonly labeled as T-T). Connect these
two terminals directly to the boiler T-T connections.
•
• To generate a DHW Demand a voltage between 20 and
260 V (ac) must be applied across the DHW Demand
terminals (53-54).
•
• To generate a Setpoint Demand, a voltage between
20 and 260 V (ac) must be applied across the Setpoint
Demand terminals (55-56).
24 V (ac) is provided on terminals 57 and 58 to power the
DHW Demand and the Setpoint Demand. Each demand
uses approximately 0.1 VA.
Terminals 59 and 60 provide a tN4 connection for tN4 devices
on either the Boiler or Mix 2 tN4 bus. Connect terminals
59 (C) and 60 (tN4) to the corresponding terminals on the
other tN4 device.
Polarity is important.
Ensure that terminal 59 (C) is connected to the C terminal
on the tN4 device and that terminal 60 (tN4) is connected
to the tN4 terminal on the tN4 device.
The example below shows the wiring to generate a DHW
Demand.
C Opn Cls
RR
61 62 63
Com Opn Cls
Valve motor
contacts

Tekmar Universal Reset Module 422 Specifications

General

Brand	Tekmar
Model	Universal Reset Module 422
Category	Control Unit
Language	English