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Mixing Reset Module 421
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Overview
The following wiring brochure describes how to wire the tekmar Mixing Reset Module 421. The 421 is to be installed in an
enclosure together with a tekmar Zone Manager. The 421 controls one boiler and one mixing (either variable speed injection
or floating action). The wiring of tekmarNet
Boiler
51 52
Menu
Item
/
Boil Sens Sup / Ret
Off / Flushing
Meets Class B: Canadian
ICES & FCC Part 15
Made in Canada
Test
Var. Pump Fuse
T2.5 A 250 V
3
Rough-in
Wiring
Rough-in
wiring
instructions
4 (tN4) components is simple and cost effective.
®
C
Floating Output:
24 V (ac) 8 VA
53
Powered Output
Mixing Reset Module 421
61
62
2.5 A
Variable Speed
Pump
N
4
Wiring
Brochure
Wiring and
installation of
specific control
Opn
Cls
Com Boil Mix
Com Out
R
R
54
55
56
57
58
59
60
Do not apply power
tN4
tektra 991-02
Var. Pump: 115V (ac) 2.5 A
Relay Rating: 115V (ac) 5 A
7.5 A
63
64
max
System P1
Pump
N
1 of 12
5
6
Data
Brochure
Control settings
Record settings &
and sequence of
wiring details for
operation
future reference
tekmar wiring Enclosure (not included)
tekmar Zone Manager
© 2007
W 421
08/07
Job
Record
W 421 - 08/07
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Summary of Contents for Tekmar 421
- Page 1 Overview The following wiring brochure describes how to wire the tekmar Mixing Reset Module 421. The 421 is to be installed in an enclosure together with a tekmar Zone Manager. The 421 controls one boiler and one mixing (either variable speed injection or floating action).
- Page 2 Other controls that are injury or death. intended and certified as safety limits must be placed into © 2007 W 421 - 08/07 2 of 12...
- Page 3 ® 4 (tN4) wiring enclosure. The enclosure comes with a Zone Manager pre-installed in the right side. Review the figure below to understand the installation of the 421: To Install the 421 1. Remove the front cover of the wiring enclosure by removing the two screws.
- Page 4 Boiler Com Boil Mix Com Out Floating Output: 24 V (ac) 8 VA 51 52 Powered Output Do not apply power Mixing Reset Module 421 Menu Item Connections tektra 991-02 from Zone Boil Sens Sup / Ret D 421 Off / Flushing...
- Page 5 Boiler Com Boil Mix Com Out Floating Output: 24 V (ac) 8 VA 51 52 Powered Output Do not apply power Mixing Reset Module 421 Menu Item Connections tektra 991-02 from Zone Boil Sens Sup / Ret D 421 Off / Flushing...
- Page 6 Boiler Com Boil Mix Com Out Floating Output: 24 V (ac) 8 VA 51 52 Powered Output Do not apply power Mixing Reset Module 421 Menu Item Connections tektra 991-02 from Zone Boil Sens Sup / Ret D 421 Off / Flushing...
- Page 7 Boiler Com Boil Mix Com Out Floating Output: 24 V (ac) 8 VA 51 52 Powered Output Do not apply power Mixing Reset Module 421 Menu Item Connections tektra 991-02 from Zone Boil Sens Sup / Ret D 421 Off / Flushing...
- Page 8 The following section explains how to wire individual terminals. devices to the Mixing Reset Module 421. For step by • • Refer to the current and voltage ratings at the back step wiring refer to the terminal number on the right of of this brochure before connecting devices to this the page.
- Page 9 • • The pumps’ ground wires are connected to the ground L & N Pump screw provided in the wiring chamber. Note: For pumps larger than the control’s rated capacity, an external isolation relay must be used. 9 of 12 © 2007 W 421 - 08/07...
- Page 10 • • Use a good quality digital thermometer with a surface temperature probe for ease of use and accuracy. Where a digital thermometer is not available, strap a spare sensor alongside the one to be tested and compare the readings. © 2007 W 421 - 08/07 10 of 12...
- Page 11 3. When the System Pump symbol is displayed in the LCD, • Also check the Plug in connections on the underside of use an electrical test meter to measure the (ac) voltage the control. between the System Pump terminals (63-64). 11 of 12 © 2007 W 421 - 08/07...
- Page 12 Web Site: www.tekmarcontrols.com Product design, software and literature are Copyright © 2007 by: All specifications are subject to change without notice. 12 of 12 tekmar Control Systems Ltd. and tekmar Control Systems, Inc. Printed in Canada. W 421 - 08/07.
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