tekmar 374 Universal Reset Control - Manual

- Data Brochure
Universal Reset Control 374
D 374
03/09
1 of 36 © 2009 D 374 - 03/09
Universal Reset Control 374
Two Mixing, Two Stage Boiler, DHW & Setpoint
Signal wiring must be rated at least 300 V.
1
Opn
Var1 Var2 1 Mix 2 Sw P2 L N P1 P3 N Pmp/Vlv Dem Dem Dem Dem Dem Dem Dem
2
Cls1 Pwr Opn Cls2 UnO Com Boil Out Com Mix1 Mix2 Mix1 Power DHW Prim Mix2 Mix1 Com Mix2 Setp DHW Boil Com
3 4 5 6 7 8 9 10 11 12 15 16 17 18
Boil Enbl.
Stage 1/
Setp Enbl.
Stage 2/
19 20 21 22 23 24 25 26 27 29 28 30 31
Do not apply power
13 14
Boiler Demand
Mix 1 Demand
Mix 2 Demand
DHW Demand
Setpoint Demand
Test
off not testing
red testing
red testing paused
Made in Canada by
tekmar Control Systems Ltd.
Power: 115 V ±10% 50/60 Hz 1750 VA
Relays: 230 V (ac) 5 A 1/3 hp, pilot duty 240 VA
Variable Pump: 230 V (ac) 2.4 A 1/6 hp, fuse T2.5 A
Demands: 20 to 260 V (ac) 2 VA
Boiler Sensor
Variable
Off
Supply Installer
Advanced
Setback 30% Enable
10% Enable
Return
Rotate Floating
H2036B
Menu Item
Input
Universal
Sensor
Included
Input
032 Timer
Optional
Input
Universal
Sensor
Included
Input
Universal
Sensor
Included
Output
Boiler
Output
Primary
Pump
Input
115 V (ac)
Power
Supply
Input
Outdoor
Sensor
Included
Input
Boiler
Demand
Input
DHW
Demand
Input
Setpoint
Demand
Input
Mix 2
Demand
Input
Mix 1
Demand
Output
Mix 1
System
Pump
Output
Mix 2
System
Pump
Output
DHW
Pump
Output
DHW
Valve
Output
Variable
Speed
driven
pump
Output
Mixing
Valve &
Actuating
Motor
OR
OR
Output
Variable
Speed
driven
pump
Output
Mixing
Valve &
Actuating
Motor
OR
For maximum heat,
press & hold Test
button for 3 seconds.
Meets Class B:
Canadian ICES
FCC Part 15
Dat
e Code
Note:
Boiler, DHW,
setpoint, or mixed
demand must be
powered with 20 to
260 V (ac) before
the control will
operate pump/valve
outputs or the boiler
is able to fire.
The tekmar Universal Reset Control 374 is designed to maximize the comfort and effi ciency provided by a hydronic heating system. The
control automatically adjusts the boiler and mix water temperatures that are delivered to the heating system by using outdoor reset. The
374 can control two separate on / off stages (or one low / high fi re) to provide outdoor reset while providing equal run time rotation of the
boilers. The 374 can operate two mixing devices, which can be either two variable speed injection pumps or two fl oating action valves.
The mixing devices can be used to supply two different reset water temperatures or one reset and one setpoint water temperature to a
space heating system. The 374 is capable of controlling an indirect Domestic Hot Water (DHW) storage tank and setpoint load. A large
easy to read display provides current system temperatures and operating status. The control has an internal timer, which can have 2
events per day on a 24 hour, 5-1-1 day or 7 day schedule.
• Installer and Advanced access levels
• Primary pump and mixing system pump outputs
• Exercising
• Test sequence to ensure proper component operation
• Internal setback timer for energy savings
• Setback input for energy savings
• CSA C US certified
Additional functions include:
• Outdoor Reset
• Two Mixing Devices
• Two Boiler Stages
• Two separate mix demands for space heating loads
• Boiler demand for space heating loads
• DHW demand for domestic hot water loads
• Setpoint demand for setpoint loads