Application - Boston Heating Supply
- Application
A 260-1 03/09
Boiler Control 260
Mechanical
260 Outdoor Sensor (S2) 070
Class 2 Transformer 24 V (ac)
120 V (ac)
Z3
Z2
Z1
M
M
M
T2
T3
T1 Boiler Sensor (S1) 082
Electrical
10A
10A
P1
260
10A
Do not apply power
P1 = Boiler Pump S1 = Boiler Sensor 082 S2 = Outdoor Sensor 070 T1, ..., T3 = Thermostats U1 = tekmar Timer 033 (optional) Z1, ..., Z3 = Zone Valve Motor End Switches
9 10 11 12
13 14 15 16 17 18
Boiler DHW Power Boil Demand Demand L N P1 N
DHW Boiler Pmp/Vlv
UnO Com Boil Out Com Indr Sw
S1
DHW Valve
DHW Priority
Advanced
DHW during UnOcc
Installer DHW Pump
1 2 3 4 5 6 7 8
Boiler
Off Off
Zone Valve Motor End Switches
= Required
Z1
= Optional
Z2
U1
S2
P1
Z3 Class 2 Transformer
= Not Used
24 V (ac) C 120 V (ac) L
R
N
Note: This is only a concept drawing. The designer must determine whether this application will work in his system and must ensure compliance with code requirements. Necessary auxiliary equipment, isolation relays (for loads greater than the specified tekmar internal relay ratings), and other safety and limit devices must be added. 1 of 8
Copyright ©2009 A 260-1 03/09
A 260-1 03/09
System Operation The Boiler Control 260 provides partial or full outdoor reset to three (or more) boiler zones. The boiler is operated at the temperature required in order to satisfy the load. Heat Source Details The heat source can be either a high mass or low mass non-condensing or low temperature boiler. Piping Details Thermostat controlled zone valves are piped into the boiler loop. The boiler pump (P1) provides circulation through these zones when heat is required. Boiler Demand When heat is required in the boiler zones, the zone valve end switches send a Boiler Demand to the 260. The 260 turns on the boiler pump (P1). The boiler supply water temperature is based on the Characterized Heating Curve settings. The boiler is fired to satisfy the required boiler supply water temperature. Whenever the boiler is fired, the 260 aims to increase the boiler supply water temperature to at least the BOIL MIN setting. All control functions and specifications are listed in the Product Catalog I 000 and Data Brochure D 260.
Control Systems
tekmar Control Systems Ltd., Canada tekmar Control Systems, Inc., U.S.A. Head Office: 5100 Silver Star Road Vernon, B.C. Canada V1B 3K4 Tel. (250) 545-7749 Fax. (250) 545-0650 Web Site: www.tekmarcontrols.com
Product design, software and literature are Copyright © 2009 by: tekmar Control Systems Ltd. and tekmar Control Systems, Inc.
2 of 8
All specifications are subject to change without notice. Printed in Canada. A 260-1 03/09.
- Application
A 260-2 03/09
Boiler Control 260
Mechanical
260 Outdoor Sensor (S2) 070
Class 2 Transformer 24 V (ac)
120 V (ac)
A2
Z3
Z2
M
M T3
A1
Z1
M T2
T1
M V1
DHW Tank P1
Boiler Sensor (S1) 082
10A
10A
Electrical
260
10A
Do not apply power
A1 = DHW Aquastat A2 = DHW High Limit Aquastat P1 = Boiler Pump S1 = Boiler Sensor 082 S2 = Outdoor Sensor 070 T1, ..., T3 = Thermostats U1 = tekmar Timer 033 (optional) V1 = DHW Valve Z1, ..., Z3 = Zone Valve Motor End Switches
DHW Valve
DHW Priority
Advanced
DHW during UnOcc
Installer DHW Pump
Off Off
1 2 3 4 5 6 7 8
9 10 11 12
13 14 15 16 17 18
Boiler DHW Power Boil Demand Demand L N P1 N
DHW Boiler Pmp/Vlv
UnO Com Boil Out Com Indr Sw
S1 Boiler
Zone Valve Motor End Switches
= Required
Z1
= Optional
U1
S2
A2 P1 A1
M V1
Z2
= Not Used
Z3
Class 2 Transformer 24 V (ac) C 120 V (ac) L
R
N
Note: This is only a concept drawing. The designer must determine whether this application will work in his system and must ensure compliance with code requirements. Necessary auxiliary equipment, isolation relays (for loads greater than the specified tekmar internal relay ratings), and other safety and limit devices must be added. 3 of 8
Copyright ©2009 A 260-2 03/09
A 260-2 03/09
System Operation The Boiler Control 260 provides partial outdoor reset to three (or more) boiler zones. The 260 also controls the supply of heat to an indirect fired Domestic Hot Water (DHW) tank. The boiler is operated at the temperature required in order to satisfy the loads. Heat Source Details The heat source can be either a high mass or low mass non-condensing boiler. Piping Details Thermostat controlled zone valves are piped into the boiler loop. The boiler pump (P1) provides circulation through these zones when heat is required. Heat is supplied to the DHW tank through a DHW valve (V1). DHW Demand When the DHW aquastat (A1) calls for heat, the 260 turns on the boiler pump (P1), opens the DHW valve (V1), and raises the boiler water temperature to at least 180°F (82°C). Boiler Demand When heat is required in the boiler zones, the zone valve end switches send a Boiler Demand to the 260. The 260 turns on the boiler pump (P1). The boiler supply water temperature is based on the Characterized Heating Curve settings. The boiler is fired to satisfy the required boiler supply water temperature. Whenever the boiler is fired, the 260 aims to increase the boiler supply water temperature to at least the BOIL MIN setting. All control functions and specifications are listed in the Product Catalog I 000 and Data Brochure D 260.
Control Systems
tekmar Control Systems Ltd., Canada tekmar Control Systems, Inc., U.S.A. Head Office: 5100 Silver Star Road Vernon, B.C. Canada V1B 3K4 Tel. (250) 545-7749 Fax. (250) 545-0650 Web Site: www.tekmarcontrols.com
Product design, software and literature are Copyright © 2009 by: tekmar Control Systems Ltd. and tekmar Control Systems, Inc.
4 of 8
All specifications are subject to change without notice. Printed in Canada. A 260-2 03/09.
- Application
A 260-3 03/09
Boiler Control 260
Mechanical
260 Outdoor Sensor (S2) 070
Class 2 Transformer 24 V (ac)
120 V (ac)
A2
Z3
Z2
M
M T3
A1
Z1
M T2
T1
DHW Tank
P2
Boiler Sensor (S1) 082
P1
10A
10A
Electrical
260
10A
Do not apply power
A1 = DHW Aquastat A2 = DHW High Limit Aquastat P1 = Boiler Pump P2 = DHW Pump S1 = Boiler Sensor 082 S2 = Outdoor Sensor 070 T1, ..., T3 = Thermostats U1 = tekmar Timer 033 (optional) Z1, ..., Z3 = Zone Valve Motor End Switches DHW Valve
DHW Priority
Advanced
DHW during UnOcc
Installer DHW Pump
Off Off
1 2 3 4 5 6 7 8
9 10 11 12
13 14 15 16 17 18
Boiler DHW Power Boil Demand Demand L N P1 N
DHW Boiler Pmp/Vlv
UnO Com Boil Out Com Indr Sw
S1 Boiler
P1 Zone Valve Motor End Switches
= Required
U1
S2
A2
P2
Z1 = Optional
A1
Z2 = Not Used
Z3
Class 2 Transformer 24 V (ac) C 120 V (ac) L
R
N
Note: This is only a concept drawing. The designer must determine whether this application will work in his system and must ensure compliance with code requirements. Necessary auxiliary equipment, isolation relays (for loads greater than the specified tekmar internal relay ratings), and other safety and limit devices must be added. 5 of 8
Copyright ©2009 A 260-3 03/09
A 260-3 03/09
System Operation The Boiler Control 260 provides partial or full reset to three (or more) boiler zones. The 260 also controls the supply of heat to an indirect fired Domestic Hot Water (DHW) tank. The boiler is operated at the temperature required in order to satisfy the loads. Heat Source Details The heat source can be either a high mass or low mass non-condensing or low temperature boiler. If using a low temperature boiler, refer to section C3 of the Data Brochure for additional information. Piping Details Thermostat controlled zone valves are piped into the boiler loop. The boiler pump (P1) provides circulation through these zones when heat is required. Heat is supplied to the DHW tank through a DHW pump (P2). DHW Demand When the DHW aquastat (A1) calls for heat, the 260 turns on the DHW pump (P2) and raises the boiler water temperature to at least 180°F (82°C). The control can provide DHW priority (refer to section C2 of the Data Brochure) by turning off the boiler pump (P1). Once the DHW demand is removed, the 260 performs a DHW Post Purge and possibly a Mixing Purge. Boiler Demand When heat is required in the boiler zones, the zone valve end switches send a Boiler Demand to the 260. The 260 turns on the boiler pump (P1). The boiler supply water temperature is based on the Characterized Heating Curve settings. The boiler is fired to satisfy the required boiler supply water temperature. Whenever the boiler is fired, the 260 aims to increase the boiler supply water temperature to at least the BOIL MIN setting. All control functions and specifications are listed in the Product Catalog I 000 and Data Brochure D 260.
Control Systems
tekmar Control Systems Ltd., Canada tekmar Control Systems, Inc., U.S.A. Head Office: 5100 Silver Star Road Vernon, B.C. Canada V1B 3K4 Tel. (250) 545-7749 Fax. (250) 545-0650 Web Site: www.tekmarcontrols.com
Product design, software and literature are Copyright © 2009 by: tekmar Control Systems Ltd. and tekmar Control Systems, Inc.
6 of 8
All specifications are subject to change without notice. Printed in Canada. A 260-3 03/09.
- Application
A 260-4 03/09
Boiler Control 260
Mechanical
260 Outdoor Sensor (S2) 070
Class 2 Transformer 24 V (ac)
120 V (ac)
A2
R1 Z1
R2 T1
R3 T2
Z2
A1 T3
Z3
P1
DHW Tank Boiler Sensor (S1) 082
Electrical
10A
10A
260
10A
Do not apply power
A1 = DHW Aquastat A2 = DHW High Limit Aquastat P1 = DHW Pump R1, ..., R3 = Relay 003 S1 = Boiler Sensor 082 S2 = Outdoor Sensor 070 T1, ..., T3 = Thermostats U1 = tekmar Timer 033 (optional) Z1, ..., Z3 = Zone Pumps
DHW Priority DHW during UnOcc Return
Advanced
T3 Installer DHW Pump
9 10 11 12
13 14 15 16 17 18
Boiler DHW Power Boil Demand Demand L N P1 N
DHW Boiler Pmp/Vlv
UnO Com Boil Out Com Indr Sw
T1
T2 DHW Valve
1 2 3 4 5 6 7 8
Off Off
7 8 1 2
R1
4 3
S1 Z1
7 8 1 2
6 5
Boiler
U1
S2
A1
R2
4 3
A2 Z2
7 8 1 2
= Required
6 5
6 5
R3
P1
4 3
Z3 = Optional
Class 2 Transformer
= Not Used
24 V (ac) C 120 V (ac) L
R
N
Note: This is only a concept drawing. The designer must determine whether this application will work in his system and must ensure compliance with code requirements. Necessary auxiliary equipment, isolation relays (for loads greater than the specified tekmar internal relay ratings), and other safety and limit devices must be added. 7 of 8
Copyright ©2009 A 260-4 03/09
A 260-4 03/09
System Operation The Boiler Control 260 provides partial or full reset to three (or more) boiler zones. The 260 also controls the supply of heat to an indirect fired Domestic Hot Water (DHW) tank. The boiler is operated at the required temperature in order to satisfy the loads. Heat Source Details The heat source can be either a high mass or low mass non-condensing or low temperature boiler. If using a low temperature boiler, refer to section C3 of the Data Brochure for additional information. Piping Details Thermostat controlled zone pumps are piped into the boiler loop. Heat is supplied to the DHW tank through a DHW pump (P1). DHW Demand When the DHW aquastat (A1) calls for heat, the 260 turns on the DHW pump (P1) and raises the boiler water temperature to at least 180°F (82°C). The control can provide DHW priority (refer to section C2 of the Data Brochure) by turning off the Boil P1 contact and not allowing any of the boiler zones to operate. Once the DHW demand is removed, the 260 performs a DHW Post Purge and possibly a Mixing Purge. Boiler Demand When heat is required in the boiler zones, the zone pump relays send a Boiler Demand to the 260. The boiler supply water temperature is based on the Characterized Heating Curve settings. The boiler is fired to satisfy the required boiler supply water temperature. Whenever the boiler is fired, the 260 aims to increase the boiler supply water temperature to at least the BOIL MIN setting. All control functions and specifications are listed in the Product Catalog I 000 and Data Brochure D 260.
Control Systems
tekmar Control Systems Ltd., Canada tekmar Control Systems, Inc., U.S.A. Head Office: 5100 Silver Star Road Vernon, B.C. Canada V1B 3K4 Tel. (250) 545-7749 Fax. (250) 545-0650 Web Site: www.tekmarcontrols.com
Product design, software and literature are Copyright © 2009 by: tekmar Control Systems Ltd. and tekmar Control Systems, Inc.
8 of 8
All specifications are subject to change without notice. Printed in Canada. A 260-4 03/09.
A 260-1 03/09
Boiler Control 260
Mechanical
260 Outdoor Sensor (S2) 070
Class 2 Transformer 24 V (ac)
120 V (ac)
Z3
Z2
Z1
M
M
M
T2
T3
T1 Boiler Sensor (S1) 082
Electrical
10A
10A
P1
260
10A
Do not apply power
P1 = Boiler Pump S1 = Boiler Sensor 082 S2 = Outdoor Sensor 070 T1, ..., T3 = Thermostats U1 = tekmar Timer 033 (optional) Z1, ..., Z3 = Zone Valve Motor End Switches
9 10 11 12
13 14 15 16 17 18
Boiler DHW Power Boil Demand Demand L N P1 N
DHW Boiler Pmp/Vlv
UnO Com Boil Out Com Indr Sw
S1
DHW Valve
DHW Priority
Advanced
DHW during UnOcc
Installer DHW Pump
1 2 3 4 5 6 7 8
Boiler
Off Off
Zone Valve Motor End Switches
= Required
Z1
= Optional
Z2
U1
S2
P1
Z3 Class 2 Transformer
= Not Used
24 V (ac) C 120 V (ac) L
R
N
Note: This is only a concept drawing. The designer must determine whether this application will work in his system and must ensure compliance with code requirements. Necessary auxiliary equipment, isolation relays (for loads greater than the specified tekmar internal relay ratings), and other safety and limit devices must be added. 1 of 8
Copyright ©2009 A 260-1 03/09
A 260-1 03/09
System Operation The Boiler Control 260 provides partial or full outdoor reset to three (or more) boiler zones. The boiler is operated at the temperature required in order to satisfy the load. Heat Source Details The heat source can be either a high mass or low mass non-condensing or low temperature boiler. Piping Details Thermostat controlled zone valves are piped into the boiler loop. The boiler pump (P1) provides circulation through these zones when heat is required. Boiler Demand When heat is required in the boiler zones, the zone valve end switches send a Boiler Demand to the 260. The 260 turns on the boiler pump (P1). The boiler supply water temperature is based on the Characterized Heating Curve settings. The boiler is fired to satisfy the required boiler supply water temperature. Whenever the boiler is fired, the 260 aims to increase the boiler supply water temperature to at least the BOIL MIN setting. All control functions and specifications are listed in the Product Catalog I 000 and Data Brochure D 260.
Control Systems
tekmar Control Systems Ltd., Canada tekmar Control Systems, Inc., U.S.A. Head Office: 5100 Silver Star Road Vernon, B.C. Canada V1B 3K4 Tel. (250) 545-7749 Fax. (250) 545-0650 Web Site: www.tekmarcontrols.com
Product design, software and literature are Copyright © 2009 by: tekmar Control Systems Ltd. and tekmar Control Systems, Inc.
2 of 8
All specifications are subject to change without notice. Printed in Canada. A 260-1 03/09.
- Application
A 260-2 03/09
Boiler Control 260
Mechanical
260 Outdoor Sensor (S2) 070
Class 2 Transformer 24 V (ac)
120 V (ac)
A2
Z3
Z2
M
M T3
A1
Z1
M T2
T1
M V1
DHW Tank P1
Boiler Sensor (S1) 082
10A
10A
Electrical
260
10A
Do not apply power
A1 = DHW Aquastat A2 = DHW High Limit Aquastat P1 = Boiler Pump S1 = Boiler Sensor 082 S2 = Outdoor Sensor 070 T1, ..., T3 = Thermostats U1 = tekmar Timer 033 (optional) V1 = DHW Valve Z1, ..., Z3 = Zone Valve Motor End Switches
DHW Valve
DHW Priority
Advanced
DHW during UnOcc
Installer DHW Pump
Off Off
1 2 3 4 5 6 7 8
9 10 11 12
13 14 15 16 17 18
Boiler DHW Power Boil Demand Demand L N P1 N
DHW Boiler Pmp/Vlv
UnO Com Boil Out Com Indr Sw
S1 Boiler
Zone Valve Motor End Switches
= Required
Z1
= Optional
U1
S2
A2 P1 A1
M V1
Z2
= Not Used
Z3
Class 2 Transformer 24 V (ac) C 120 V (ac) L
R
N
Note: This is only a concept drawing. The designer must determine whether this application will work in his system and must ensure compliance with code requirements. Necessary auxiliary equipment, isolation relays (for loads greater than the specified tekmar internal relay ratings), and other safety and limit devices must be added. 3 of 8
Copyright ©2009 A 260-2 03/09
A 260-2 03/09
System Operation The Boiler Control 260 provides partial outdoor reset to three (or more) boiler zones. The 260 also controls the supply of heat to an indirect fired Domestic Hot Water (DHW) tank. The boiler is operated at the temperature required in order to satisfy the loads. Heat Source Details The heat source can be either a high mass or low mass non-condensing boiler. Piping Details Thermostat controlled zone valves are piped into the boiler loop. The boiler pump (P1) provides circulation through these zones when heat is required. Heat is supplied to the DHW tank through a DHW valve (V1). DHW Demand When the DHW aquastat (A1) calls for heat, the 260 turns on the boiler pump (P1), opens the DHW valve (V1), and raises the boiler water temperature to at least 180°F (82°C). Boiler Demand When heat is required in the boiler zones, the zone valve end switches send a Boiler Demand to the 260. The 260 turns on the boiler pump (P1). The boiler supply water temperature is based on the Characterized Heating Curve settings. The boiler is fired to satisfy the required boiler supply water temperature. Whenever the boiler is fired, the 260 aims to increase the boiler supply water temperature to at least the BOIL MIN setting. All control functions and specifications are listed in the Product Catalog I 000 and Data Brochure D 260.
Control Systems
tekmar Control Systems Ltd., Canada tekmar Control Systems, Inc., U.S.A. Head Office: 5100 Silver Star Road Vernon, B.C. Canada V1B 3K4 Tel. (250) 545-7749 Fax. (250) 545-0650 Web Site: www.tekmarcontrols.com
Product design, software and literature are Copyright © 2009 by: tekmar Control Systems Ltd. and tekmar Control Systems, Inc.
4 of 8
All specifications are subject to change without notice. Printed in Canada. A 260-2 03/09.
- Application
A 260-3 03/09
Boiler Control 260
Mechanical
260 Outdoor Sensor (S2) 070
Class 2 Transformer 24 V (ac)
120 V (ac)
A2
Z3
Z2
M
M T3
A1
Z1
M T2
T1
DHW Tank
P2
Boiler Sensor (S1) 082
P1
10A
10A
Electrical
260
10A
Do not apply power
A1 = DHW Aquastat A2 = DHW High Limit Aquastat P1 = Boiler Pump P2 = DHW Pump S1 = Boiler Sensor 082 S2 = Outdoor Sensor 070 T1, ..., T3 = Thermostats U1 = tekmar Timer 033 (optional) Z1, ..., Z3 = Zone Valve Motor End Switches DHW Valve
DHW Priority
Advanced
DHW during UnOcc
Installer DHW Pump
Off Off
1 2 3 4 5 6 7 8
9 10 11 12
13 14 15 16 17 18
Boiler DHW Power Boil Demand Demand L N P1 N
DHW Boiler Pmp/Vlv
UnO Com Boil Out Com Indr Sw
S1 Boiler
P1 Zone Valve Motor End Switches
= Required
U1
S2
A2
P2
Z1 = Optional
A1
Z2 = Not Used
Z3
Class 2 Transformer 24 V (ac) C 120 V (ac) L
R
N
Note: This is only a concept drawing. The designer must determine whether this application will work in his system and must ensure compliance with code requirements. Necessary auxiliary equipment, isolation relays (for loads greater than the specified tekmar internal relay ratings), and other safety and limit devices must be added. 5 of 8
Copyright ©2009 A 260-3 03/09
A 260-3 03/09
System Operation The Boiler Control 260 provides partial or full reset to three (or more) boiler zones. The 260 also controls the supply of heat to an indirect fired Domestic Hot Water (DHW) tank. The boiler is operated at the temperature required in order to satisfy the loads. Heat Source Details The heat source can be either a high mass or low mass non-condensing or low temperature boiler. If using a low temperature boiler, refer to section C3 of the Data Brochure for additional information. Piping Details Thermostat controlled zone valves are piped into the boiler loop. The boiler pump (P1) provides circulation through these zones when heat is required. Heat is supplied to the DHW tank through a DHW pump (P2). DHW Demand When the DHW aquastat (A1) calls for heat, the 260 turns on the DHW pump (P2) and raises the boiler water temperature to at least 180°F (82°C). The control can provide DHW priority (refer to section C2 of the Data Brochure) by turning off the boiler pump (P1). Once the DHW demand is removed, the 260 performs a DHW Post Purge and possibly a Mixing Purge. Boiler Demand When heat is required in the boiler zones, the zone valve end switches send a Boiler Demand to the 260. The 260 turns on the boiler pump (P1). The boiler supply water temperature is based on the Characterized Heating Curve settings. The boiler is fired to satisfy the required boiler supply water temperature. Whenever the boiler is fired, the 260 aims to increase the boiler supply water temperature to at least the BOIL MIN setting. All control functions and specifications are listed in the Product Catalog I 000 and Data Brochure D 260.
Control Systems
tekmar Control Systems Ltd., Canada tekmar Control Systems, Inc., U.S.A. Head Office: 5100 Silver Star Road Vernon, B.C. Canada V1B 3K4 Tel. (250) 545-7749 Fax. (250) 545-0650 Web Site: www.tekmarcontrols.com
Product design, software and literature are Copyright © 2009 by: tekmar Control Systems Ltd. and tekmar Control Systems, Inc.
6 of 8
All specifications are subject to change without notice. Printed in Canada. A 260-3 03/09.
- Application
A 260-4 03/09
Boiler Control 260
Mechanical
260 Outdoor Sensor (S2) 070
Class 2 Transformer 24 V (ac)
120 V (ac)
A2
R1 Z1
R2 T1
R3 T2
Z2
A1 T3
Z3
P1
DHW Tank Boiler Sensor (S1) 082
Electrical
10A
10A
260
10A
Do not apply power
A1 = DHW Aquastat A2 = DHW High Limit Aquastat P1 = DHW Pump R1, ..., R3 = Relay 003 S1 = Boiler Sensor 082 S2 = Outdoor Sensor 070 T1, ..., T3 = Thermostats U1 = tekmar Timer 033 (optional) Z1, ..., Z3 = Zone Pumps
DHW Priority DHW during UnOcc Return
Advanced
T3 Installer DHW Pump
9 10 11 12
13 14 15 16 17 18
Boiler DHW Power Boil Demand Demand L N P1 N
DHW Boiler Pmp/Vlv
UnO Com Boil Out Com Indr Sw
T1
T2 DHW Valve
1 2 3 4 5 6 7 8
Off Off
7 8 1 2
R1
4 3
S1 Z1
7 8 1 2
6 5
Boiler
U1
S2
A1
R2
4 3
A2 Z2
7 8 1 2
= Required
6 5
6 5
R3
P1
4 3
Z3 = Optional
Class 2 Transformer
= Not Used
24 V (ac) C 120 V (ac) L
R
N
Note: This is only a concept drawing. The designer must determine whether this application will work in his system and must ensure compliance with code requirements. Necessary auxiliary equipment, isolation relays (for loads greater than the specified tekmar internal relay ratings), and other safety and limit devices must be added. 7 of 8
Copyright ©2009 A 260-4 03/09
A 260-4 03/09
System Operation The Boiler Control 260 provides partial or full reset to three (or more) boiler zones. The 260 also controls the supply of heat to an indirect fired Domestic Hot Water (DHW) tank. The boiler is operated at the required temperature in order to satisfy the loads. Heat Source Details The heat source can be either a high mass or low mass non-condensing or low temperature boiler. If using a low temperature boiler, refer to section C3 of the Data Brochure for additional information. Piping Details Thermostat controlled zone pumps are piped into the boiler loop. Heat is supplied to the DHW tank through a DHW pump (P1). DHW Demand When the DHW aquastat (A1) calls for heat, the 260 turns on the DHW pump (P1) and raises the boiler water temperature to at least 180°F (82°C). The control can provide DHW priority (refer to section C2 of the Data Brochure) by turning off the Boil P1 contact and not allowing any of the boiler zones to operate. Once the DHW demand is removed, the 260 performs a DHW Post Purge and possibly a Mixing Purge. Boiler Demand When heat is required in the boiler zones, the zone pump relays send a Boiler Demand to the 260. The boiler supply water temperature is based on the Characterized Heating Curve settings. The boiler is fired to satisfy the required boiler supply water temperature. Whenever the boiler is fired, the 260 aims to increase the boiler supply water temperature to at least the BOIL MIN setting. All control functions and specifications are listed in the Product Catalog I 000 and Data Brochure D 260.
Control Systems
tekmar Control Systems Ltd., Canada tekmar Control Systems, Inc., U.S.A. Head Office: 5100 Silver Star Road Vernon, B.C. Canada V1B 3K4 Tel. (250) 545-7749 Fax. (250) 545-0650 Web Site: www.tekmarcontrols.com
Product design, software and literature are Copyright © 2009 by: tekmar Control Systems Ltd. and tekmar Control Systems, Inc.
8 of 8
All specifications are subject to change without notice. Printed in Canada. A 260-4 03/09.
