tekmar 274 - Installation Manual
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Table of Contents:
- Page 2 – How to Use the Data Brochure; Menu; Table of Contents
- Page 3 – Item Field; Menu Item; Display
- Page 4 – Demand; OR; from EMS; Characterized Heating Curve; Boiler Characterized Heating Curve; Access Level
- Page 5 – Room Setting in Adjust Menu
- Page 6 – Boiler Operation
- Page 7 – LO
- Page 8 – Relay Setting in Adjust Menu; Alert; Boiler Run Time in View Menu; Manual Differential; Automatic Differential; djust Menu; Combustion Air and Alert Settings
- Page 9 – an externally powered DHW demand when using a DHW; Domestic Hot Water Operation
- Page 10 – DHW Differential Setting in Adjust Menu; Boiler Target Temperature during a DHW; Mode OFF / No DHW Generation
- Page 11 – even if there are less than 4 boilers.; Mode 6 – Dedicated DHW
- Page 12 – Automatic Priority Override
- Page 13 – Setpoint Demand; Powered Setpoint Demand; Boiler Target Temperature during a Setpoint; Mode OFF - No Setpoint Operation; Mode 2 - Setpoint in Parallel with Priority; Setpoint Operation
- Page 14 – Mode 3 - Setpoint in Primary/Secondary with No Priority; Mode 4 - Setpoint in Primary/Secondary with Priority; Setpoint Priority Override Setting in; Conditional DHW Priority; target temperature
- Page 15 – Input Signal; Offset Setting in Adjust Menu; Example; Section G
- Page 16 – Normal Operation; Pump Operation
- Page 17 – The Setback / Off DIP Switch must be set to Setback; Exercising
- Page 18 – Schedule Types; Setting the Schedule
- Page 19 – Network; tN4 Thermostat; tekmarNet
- Page 20 – General; Powered Input Connections; CAUTION; Step One — Getting Ready; Installation; Step Two — Mounting the Base
- Page 21 – Non-Powered Input Connections; The connection is polarity sensitive. Ensure that
- Page 22 – Powered Output Connections; Primary Pump P1; Non-Powered Output Connections
- Page 23 – connect them together.; Testing the EMS Output; Step Five — Testing the Wiring
- Page 24 – If the relay is set to boiler ignition:; Testing DHW and Primary Pumps; If DHW Mode is enabled:
- Page 25 – Testing the Demands; Cleaning the Control; Control Settings; DIP Switch Settings
- Page 27 – SECTION C; VIEW MENU; Display Menus
- Page 28 – SECTION H
- Page 29 – Actual; ADJUST MENU
- Page 30 – SECTION B
- Page 32 – (parallel with last
- Page 35 – TIME MENU
- Page 36 – SECTION J; SECTION J; SECTION K; SECTION K; SECTION K; SCHEDULE MENU
- Page 39 – SECTION M; MISC MENU
- Page 40 – HAZARD; Max Heat; Test; Zone Test; Step 1; Testing the Control
- Page 42 – More than one tN4 device has been assigned the same master number.
- Page 44 – Technical Data
Input
Universal
Sensor
Included
Input
Universal
Sensor
Included
tN4
Boiler
Bus
Input
Outdoor Sensor
Included
OR
0-10 or 2-10 V (dc)
from EMS
Output
Up to 4
On/Off Boilers
Input
115 V (ac)
Power Supply
Input
Flow OR
C.A. Proof
Output
Up to 2
Boiler Pumps
Output
DHW Pump
OR
Primary Pump
Output
Combustion
Air Damper
OR Alert
OR
OR
Output
Primary
Pump
Input
DHW OR
Setpoint
Demand
Signal
Input
Boiler
Demand
Signal
Primary
DHW
1
1 3
2 4
VIEW
Demands
Setback
Boiler Control 274
One tN4, Four Stage Boiler & DHW / Setpoint
Menu
Item
Test
Boiler Demand
DHW / Setpoint Demand
Proof Demand
EMS Input Signal
Priority Override
Power
115 V ±10% 60 Hz 7 VA, 1150 VA max.
Relays
230 V (ac) 5 A 1/3 hp
Demands 20 to 260 V (ac) 2 VA
Made in Canada by
tekmar Control Systems Ltd
tektra 1020-02
Meets Class B:
Canadian ICES
FCC Part 15
For maximum heat,
press and hold
Test
button for 3 seconds.
not testing
testing
testing paused
off
red
red
Off
EMS
Rotate
Fixed Last
Pump Sequencer
Exercise
Off
Date Code
H2050
A
Signal wiring must be rated at least 300 V.
DHW
23
/Setp
Com
24
Dem
Pr.
25
Dem
2
5
1
3
–
+
4
6
BRet/
Com
tN4
Boil
Out
Com
Prim
P1
L
N
20
Power
22
21
8
7
Do not apply power
18
DHW
/ P2
17
19
10
9
12
11
14
13
16
15
Fixed Lead
First On / Last Off
First On / First Off
Relay
1
Relay
2
Relay
3
Relay
4
C.A. /
Alert
Boiler
Demand
Sup
DHW
Zone Load Shedding
1
Up to 4 On/Off Boilers
2
Up to 2 On/Off Boilers & 2 Pumps
3
Up to 2 Lo/Hi Boilers
4
1 Lo/Hi Boiler & 1 Pump
5
1 Three Stage Boiler & Pump
6
1 Four Stage Boiler
Modes
The Boiler Control 274 operates up to four on/off boilers to provide outdoor reset operation, domestic hot water and setpoint operation
with priority. When operating as a tN4 System Control, the 274 can connect with up to 24 tN4 devices on a single boiler bus. The 274
has primary pump sequencing capabilities along with a flow proof or combustion air damper proof demand.
• tN4 Compatible
• 24 Hour, 5-1-1, 7 Day Schedule
• Flow or Combustion Air Proof
• Four On/Off Boilers
• Equal Run Time Rotation
• Primary Pump Sequencing
• DHW Operation
• Optional DHW Sensor
• Setpoint Operation
Additional functions include
Installation, Operation and Maintenance Manual
Boiler Control 274
IOM-T-274
WARNING
!
Please read carefully before proceeding with
installation. Your failure to follow any attached
instructions or operating parameters may lead to the
product’s failure.
Keep this Manual for future reference.
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About this manual
- Brand
- tekmar
- Model
- 274
- Document type
- Installation Manual
- Category
- Boiler
- Language(s)
- English
- Pages
- 44
- Format
Summary
2 IOM-T-274 2123 © 2021 Watts How to Use the Data Brochure This brochure is organized into three main sections.They are: 1) Sequence of Operation, 2) Installation, 3) Control Settings and 4) Testing and Troubleshooting. The Control Settings section of this brochure describes the various items that a...
3 IOM-T-274 2123 © 2021 Watts PRIMARY PUMP Displays when primary pump 1 or primary pump 2 is in operation BOILER Displays which boiler stage is operating LOCK Displays when adjusting Access level if Switch is set to lock. WARNING Displays when an error exists. COMMUNICATION BUS Displays when tN4 the...
4 IOM-T-274 2123 © 2021 Watts Once the control receives a boiler demand it calculates a target water temperature based on the characterized heating curve to provide outdoor reset for space heating. The control can receive a boiler demand three different ways: 1. By applying 20-260 V (ac) to the boil...