Table of Contents
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- Data Brochure
One Stage Boiler Control 253
F
H. Dem
Boiler
Boiler Supply
Minimum Boiler
Target Boiler
Differential
WWSD
Starting Temp.
Curve
Use
(hours)
Item
NRTL/C
One Stage Boiler
R
LR 58223
Control 253
Outdoor Sensor
Included
Control Strategy
OUTDOOR RESET
In order to properly control a hot water heating system, the heat supplied
to the building must equal the heat lost by the building.
• The heat supplied to a building is proportional to the temperature of the
supply water and the surface area of the heating element. A small surface
area such as baseboard radiators requires a higher water temperature
than a larger surface area such as radiant floors.
• The heat lost from a building is dependent on the outdoor temperature,
as well as other factors. As the outdoor temperature drops, the building
heat loss increases.
The One Stage Boiler Control 253 is a microprocessor-based control designed to regulate the sup-
ply water temperature from a single boiler based on the outdoor temperature. To avoid boiler short
cycling and large temperature swings, the 253 is able to continuously adjust the boiler differential.
The 253 includes functions such as Warm Weather Shut Down (WWSD), Minimum Boiler setting, and
a Starting Temperature setting. The control has a digital, liquid crystal display (LCD) that normally
displays the Boiler Supply temperature, but can display other temperatures and settings.
Control Strategy . . . . . . . . . . . . pg. 1
Sequence of Operation . . . . . . . pg. 2
Installation . . . . . . . . . . . . . . . . . pg. 3
Settings . . . . . . . . . . . . . . . . . . . pg. 4
Press & Hold:
Item
H. Dem
Boiler
Boiler Supply
No power
1
Com
Sen
Input
Boiler Sensor
Included
Input
Power:
24 V 50/60 Hz 3 VA
Boiler Relay:
120 V (ac) 5 A 1/6 hp
- displays control settings
pilot duty 240 VA
- displays hundreds of hours of use
- displays hours of use
Mar 97
31000265
OUTDOOR
F C
PRGM
Minimum Boiler
WWSD
Target Boiler
Differential
Starting Temp.
Curve
USE
(hours)
Item
NRTL /C
One Stage Boiler
R
LR 58223
Control 253
Made in Canada
2
3
5
6
4
Boil
Out
Signal wiring must be
rated at least 300V
Sen
Sen
Boiler
T
Temperature
Testing the Control . . . . . . . pg. 6
Error Messages. . . . . . . . . . . pg. 7
Technical Data . . . . . . . . . . . pg. 8
Limited Warranty . . . . . . . . . pg. 8
Input
24 V (ac)
Power Supply
7
8
Power
R+ C-
Input
Heat Demand
Output
Boiler
Constant
Outdoor
Room Temperature
Drop
D 253
05/97
Heat
Loss
Increase
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Table of Contents
Related Manuals for Tekmar One Stage Boiler Control 253
Summary of Contents for Tekmar One Stage Boiler Control 253
- Page 1 05/97 One Stage Boiler Control 253 The One Stage Boiler Control 253 is a microprocessor-based control designed to regulate the sup- ply water temperature from a single boiler based on the outdoor temperature. To avoid boiler short cycling and large temperature swings, the 253 is able to continuously adjust the boiler differential.
-
Page 2: Heating Curve
Using this approach, the (88) heat lost from the building is matched by the heat input to the building. A tekmar reset (77) control utilizes a heating curve to set the relationship between outdoor temperature and (65) supply water temperature. - Page 3 STEP ONE GETTING READY Check the contents of this package. If any of the contents listed are missing or damaged, please contact your wholesaler or tekmar sales representative for assistance. Type 253 includes: •...
-
Page 4: Warm Weather Shut Down (Wwsd )
STEP FOUR TESTING THE WIRING No wires should be connected to the control during testing. A good quality electrical test meter, capable of reading from at least 0 — 200 V (ac) and at least 0 — 2,000,000 Ohms, is essential to properly test the wiring and sensors. -
Page 5: Control Adjustments
Differential The differential adjustment sets how far the actual boiler supply water temperature may deviate from the desired temperature before the boiler is turned on or off, and it is determined by the flow rate through the system pump relative to the heat output by the boiler. The Differential can be adjusted to Ad (Auto differential) or from 2 to 42°F (1 to 23°C). -
Page 6: Troubleshooting
All settings will be saved even during power down of the control Testing the Control STEP SEVEN TESTING If testing is required with the One Stage Boiler Control 253, follow the testing procedure in step four of the installation procedure on page 4 of this brochure. STEP EIGHT TROUBLESHOOTING As in any troubleshooting procedure, it is important to isolate a problem as much as possible before proceeding. -
Page 7: Before You Leave
Adjustment of Settings • If the outdoor temperature is cold and the rooms are cold, increase the Curve setting by 0.1 per day. • If the outdoor temperature is near the WWSD temperature and the rooms are cold, increase the Starting Temp . setting. •... -
Page 8: Technical Data
This warranty is in lieu of all other warranties, express or implied, including, without limitation, warranties of merchantability, fitness for a particular purpose, The liability of tekmar shall be limited to the cost of parts and labour provided by tekmar durability or description of the product, its non-infringement of any relevant...
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