Electronic Controls
Electronic Controls
The FuelMizer™ (SR501-OR) is a microprocessor-based control designed to regulate the supply water temperature of a single boiler, based on the outdoor temperature. The FuelMizer is a boiler reset control and switching relay in one unit; it is ideal for retrofit application, but may also be used in new installations as well.
©Taco Catalog #100-100 Supersedes: New
Effective Date: 06/12/12 Printed in USA
SR 501OR-
6 AMP
INPUT 120 VAC
RELAY
ZONE 1 120 VAC
N H N H
Submittal Data Information FuelMizer™
Instruction Sheet # 102-420 Supersedes: New
N
POWER INPUT (120 VAC)
Effective: 06/12/12 SYSTEM CIRCULATOR (OPTIONAL)
H
ONE ZONE INSTALLATION W/O INDIRECT DHW
Application
The FuelMizer (SR501-OR) includes functions such as automatic reset ratio calculation, warm weather shut down (WWSD), minimum boiler temperature setting, and boiler differential setting. The control also includes both boiler and outdoor sensors. 24 VAC THERMOSTAT
THERMOSTATS (24VAC)
24 VAC ZONE VALVES PUMP END SWITCH
X
X
BOILER CONTROL
DESIGN OUTDOOR TEMPERATURE FOR 180°F SUPPLY TEMPERATURE -10 0 10 -20 20 POT1 -30 30
OFF
X X R W C R W OUTDOOR BOILER
TSTAT
SENSOR
DHW
ONE ZONE SWITCHING RELAY WITH OUTDOOR RESET
40
DESIGN OUTDOOR TEMPERATURE FOR 180°F SUPPLY TEMPERATURE -10 0 10 -20 20 POT1 -30 30
OFF
40
X X R W C R W OUTDOOR BOILER
TSTAT
DHW
VALVE 3
ZONE 2 1 2 3 4
ZONE 3 1 2 3 4
1 2 3
1 2 3
TACO 3 WIRE ZONE VALVE
TACO 3 WIRE ZONE VALVE
DHW OVERRIDE BOILER RELAY
ZONE 1 120 VAC
N H N H POWER INPUT (120 VAC)
SYSTEM CIRCULATOR (OPTIONAL)
Configuration OUTDOOR Dip SwitchEs TEMPERATURE CONTROL ADJUSTMENT
A
DHW AQUASTAT
SENSOR CONNECTIONS
ZONE 3 PRIORITY
R W C R W C R W C ZONE 1 ZONE 2 ZONE 3 THERMOSTATS PRIORITY
SYSTEM CIRCULATOR (OPTIONAL)
DEMAND INPUT CONNECTIONS
BOILER CONTROL CONNECTIONS
THERMOSTATS (24VAC)
N H
MULTI-ZONE INSTALLATION WITH ZONE CONTROL, WITH INDIRECT DHW
ONE ZONE INSTALLATION W/O INDIRECT DHW
FUSE 5 AMP
6 AMP
INPUT 120 VAC
ZONE 1 120 VAC
H
POWER IN 24 VAC
LED INDICATORS
TSTAT
BOILER RELAY
X X ISOLATED END SWITCH
SUPPLY SENSOR
POWER
N
POWER INPUT (120 VAC)
SENSOR
ONE ZONE SWITCHING RELAY WITH OUTDOOR RESET
SR 501OR-4
SR 501OR-4
INPUT 120 VAC
ON OFF
LED INDICATORS
POWER
EXISTING ZONE VALVE CONTROL
24 VAC ZONE VALVES PUMP END SWITCH
X
Relays: .....................Boiler Relay ..................................1 amp @ 24 VAC
X
ZONE 1 1 2 3 4
ZONE 3 PUMP END SWITCH
N/O COM N/C
BOILER CONTROL
T STAT 1
VALVE 1
T STAT 2
VALVE 2
T STAT 3
VALVE 3
EXTERNAL DIAGNOSTIC LED'S
PRIORITY
ZONE 2 1 2 3 4
JUMPER 3&4 2 WIRE ZONE VALVE (NO END SWITCH) MUST USE JUMPER
ZONE 3 1 2 3 4
1 2 3
1 2 3
TACO 3 WIRE ZONE VALVE
TACO 3 WIRE ZONE VALVE
Savings from 5% to 30%
OUTDOOR SENSOR
$900
BOILER SUPPLY SENSOR
OFF ON
$800
SW1
40
X X R W C R W OUTDOOR BOILER
TSTAT
DHW
SENSOR
ONE ZONE SWITCHING RELAY WITH OUTDOOR RESET
$700
SUPPLY SENSOR
Savings
DESIGN OUTDOOR TEMPERATURE FOR 180°F SUPPLY TEMPERATURE -10 0 10 -20 20 POT1 -30 30
OFF
LED INDICATORS POWER
Sensors: ..................NTC thermistor, ..................................10 kΩ @ 77°F
TSTAT
SR 501OR-4
DHW OVERRIDE
..................................(25°C ±0.2°C) ..................................ß=3892
WWSD: ..................70°F (21°C)
VALVE 2
T STAT 3
SW1
SUPPLY SENSOR
LED INDICATORS
6 AMP
Power Supply: .......120/60/1 VAC, ..................................12 amps maximum
Differential: ............10°F or 20°F ..................................(6°C or 12°C)
VALVE 1
T STAT 2
BOILER SUPPLY SENSOR
N H N H
Enclosure: ...............TYPE 1
Boiler ...................... Minimum: ...............70°F or 140°F ..................................(21°C or 60°C)
LED INDICATORS
T STAT 1
SW1
Control: ..................Microprocessor ..................................control. This is not ........................... a safety (limit) ........................... control.
Outdoor ................ Design Temp.: ........-30°F to 40°F ..................................(-35°C to 5°C)
OFF
PRIORITY
OFF ON
DHW OVERRIDE
Thermostat: ...........24 VAC ..................................Class 2 Output
ON
OUTDOOR SENSOR
OFF ON
TSTAT
..................................Circulator Relay ..................................1⁄3 HP ..................................(6 FLA, 36 LRA)
ZONE 1 1 2 3 4
ZONE 3 PUMP END SWITCH
N/O COM N/C
2 WIRE ZONE VALVE (NO END SWITCH) MUST USE JUMPER
BOILER SUPPLY SENSOR
BOILER CONTROL
DHW AQUASTAT
POWER
JUMPER 3&4
OUTDOOR SENSOR
Specifications
Approvals: ..............UL listed for ..................................US and Canada, ..................................Temperature ..................................Indicating and ..................................Regulating ..................................Equipment.
R W C R W C R W C ZONE 1 ZONE 2 ZONE 3 THERMOSTATS PRIORITY
EXISTING ZONE VALVE CONTROL
POWER
Dimensions: ...........4-1⁄4" W x 5-1⁄4" H ..................................x 2-3⁄4" D
A ZONE 3 PRIORITY
X X ISOLATED END SWITCH
FUSE 5 AMP
• Full outdoor boiler reset control • Can control system or zone valve circulator • Over-ride of outdoor reset when DHW tank is calling • Easy to install and set; will not affect boiler’s warranty • Front mounted LED lights for full diagnostic information • Ideal for retrofit applications of just about any hot water boiler • Typical energy savings is about 14% with some customers experiencing up to 30%
POWER IN 24 VAC
Features
6 AMP
INPUT 120 VAC
$600 $500
Savings Range
$400 $300
BOILER RELAY
$200 $100
ZONE 1 120 VAC
$0
N H N H
$0
$1000
$2000
$3000
$4000
Yearly Amount Spent on Fuel POWER INPUT
N
(120 VAC) H TRANSFORMER
POWER INPUT CONNECTIONS
CIRCULATOR OUTPUT CONNECTIONS
SYSTEM CIRCULATOR (OPTIONAL)
MULTI-ZONE INSTALLATION WITH ZONE CONTROL, WITH INDIRECT DHW
FUSE
The installer must ensure that this control and its wiring are isolated and/or shielded from strong sources of electromagnetic noise. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
Taco Inc., 1160 Cranston Street. Cranston, RI 02920 / (401) 942-8000 / Fax (401) 942-2360 Taco (Canada) Ltd., 8450 Lawson Road, Unit #3, Milton, Ontario L9T 0J8 / (905) 564-9422 / Fax (905) 564-9436 www.taco-hvac.com
The FuelMizer™ (SR501-OR) is a microprocessor-based control designed to regulate the supply water temperature of a single boiler, based on the outdoor temperature. The FuelMizer is a boiler reset control and switching relay in one unit; it is ideal for retrofit application, but may also be used in new installations as well.
©Taco Catalog #100-100 Supersedes: New
Effective Date: 06/12/12 Printed in USA
SR 501OR-
6 AMP
INPUT 120 VAC
RELAY
ZONE 1 120 VAC
N H N H
Submittal Data Information FuelMizer™
Instruction Sheet # 102-420 Supersedes: New
N
POWER INPUT (120 VAC)
Effective: 06/12/12 SYSTEM CIRCULATOR (OPTIONAL)
H
ONE ZONE INSTALLATION W/O INDIRECT DHW
Application
The FuelMizer (SR501-OR) includes functions such as automatic reset ratio calculation, warm weather shut down (WWSD), minimum boiler temperature setting, and boiler differential setting. The control also includes both boiler and outdoor sensors. 24 VAC THERMOSTAT
THERMOSTATS (24VAC)
24 VAC ZONE VALVES PUMP END SWITCH
X
X
BOILER CONTROL
DESIGN OUTDOOR TEMPERATURE FOR 180°F SUPPLY TEMPERATURE -10 0 10 -20 20 POT1 -30 30
OFF
X X R W C R W OUTDOOR BOILER
TSTAT
SENSOR
DHW
ONE ZONE SWITCHING RELAY WITH OUTDOOR RESET
40
DESIGN OUTDOOR TEMPERATURE FOR 180°F SUPPLY TEMPERATURE -10 0 10 -20 20 POT1 -30 30
OFF
40
X X R W C R W OUTDOOR BOILER
TSTAT
DHW
VALVE 3
ZONE 2 1 2 3 4
ZONE 3 1 2 3 4
1 2 3
1 2 3
TACO 3 WIRE ZONE VALVE
TACO 3 WIRE ZONE VALVE
DHW OVERRIDE BOILER RELAY
ZONE 1 120 VAC
N H N H POWER INPUT (120 VAC)
SYSTEM CIRCULATOR (OPTIONAL)
Configuration OUTDOOR Dip SwitchEs TEMPERATURE CONTROL ADJUSTMENT
A
DHW AQUASTAT
SENSOR CONNECTIONS
ZONE 3 PRIORITY
R W C R W C R W C ZONE 1 ZONE 2 ZONE 3 THERMOSTATS PRIORITY
SYSTEM CIRCULATOR (OPTIONAL)
DEMAND INPUT CONNECTIONS
BOILER CONTROL CONNECTIONS
THERMOSTATS (24VAC)
N H
MULTI-ZONE INSTALLATION WITH ZONE CONTROL, WITH INDIRECT DHW
ONE ZONE INSTALLATION W/O INDIRECT DHW
FUSE 5 AMP
6 AMP
INPUT 120 VAC
ZONE 1 120 VAC
H
POWER IN 24 VAC
LED INDICATORS
TSTAT
BOILER RELAY
X X ISOLATED END SWITCH
SUPPLY SENSOR
POWER
N
POWER INPUT (120 VAC)
SENSOR
ONE ZONE SWITCHING RELAY WITH OUTDOOR RESET
SR 501OR-4
SR 501OR-4
INPUT 120 VAC
ON OFF
LED INDICATORS
POWER
EXISTING ZONE VALVE CONTROL
24 VAC ZONE VALVES PUMP END SWITCH
X
Relays: .....................Boiler Relay ..................................1 amp @ 24 VAC
X
ZONE 1 1 2 3 4
ZONE 3 PUMP END SWITCH
N/O COM N/C
BOILER CONTROL
T STAT 1
VALVE 1
T STAT 2
VALVE 2
T STAT 3
VALVE 3
EXTERNAL DIAGNOSTIC LED'S
PRIORITY
ZONE 2 1 2 3 4
JUMPER 3&4 2 WIRE ZONE VALVE (NO END SWITCH) MUST USE JUMPER
ZONE 3 1 2 3 4
1 2 3
1 2 3
TACO 3 WIRE ZONE VALVE
TACO 3 WIRE ZONE VALVE
Savings from 5% to 30%
OUTDOOR SENSOR
$900
BOILER SUPPLY SENSOR
OFF ON
$800
SW1
40
X X R W C R W OUTDOOR BOILER
TSTAT
DHW
SENSOR
ONE ZONE SWITCHING RELAY WITH OUTDOOR RESET
$700
SUPPLY SENSOR
Savings
DESIGN OUTDOOR TEMPERATURE FOR 180°F SUPPLY TEMPERATURE -10 0 10 -20 20 POT1 -30 30
OFF
LED INDICATORS POWER
Sensors: ..................NTC thermistor, ..................................10 kΩ @ 77°F
TSTAT
SR 501OR-4
DHW OVERRIDE
..................................(25°C ±0.2°C) ..................................ß=3892
WWSD: ..................70°F (21°C)
VALVE 2
T STAT 3
SW1
SUPPLY SENSOR
LED INDICATORS
6 AMP
Power Supply: .......120/60/1 VAC, ..................................12 amps maximum
Differential: ............10°F or 20°F ..................................(6°C or 12°C)
VALVE 1
T STAT 2
BOILER SUPPLY SENSOR
N H N H
Enclosure: ...............TYPE 1
Boiler ...................... Minimum: ...............70°F or 140°F ..................................(21°C or 60°C)
LED INDICATORS
T STAT 1
SW1
Control: ..................Microprocessor ..................................control. This is not ........................... a safety (limit) ........................... control.
Outdoor ................ Design Temp.: ........-30°F to 40°F ..................................(-35°C to 5°C)
OFF
PRIORITY
OFF ON
DHW OVERRIDE
Thermostat: ...........24 VAC ..................................Class 2 Output
ON
OUTDOOR SENSOR
OFF ON
TSTAT
..................................Circulator Relay ..................................1⁄3 HP ..................................(6 FLA, 36 LRA)
ZONE 1 1 2 3 4
ZONE 3 PUMP END SWITCH
N/O COM N/C
2 WIRE ZONE VALVE (NO END SWITCH) MUST USE JUMPER
BOILER SUPPLY SENSOR
BOILER CONTROL
DHW AQUASTAT
POWER
JUMPER 3&4
OUTDOOR SENSOR
Specifications
Approvals: ..............UL listed for ..................................US and Canada, ..................................Temperature ..................................Indicating and ..................................Regulating ..................................Equipment.
R W C R W C R W C ZONE 1 ZONE 2 ZONE 3 THERMOSTATS PRIORITY
EXISTING ZONE VALVE CONTROL
POWER
Dimensions: ...........4-1⁄4" W x 5-1⁄4" H ..................................x 2-3⁄4" D
A ZONE 3 PRIORITY
X X ISOLATED END SWITCH
FUSE 5 AMP
• Full outdoor boiler reset control • Can control system or zone valve circulator • Over-ride of outdoor reset when DHW tank is calling • Easy to install and set; will not affect boiler’s warranty • Front mounted LED lights for full diagnostic information • Ideal for retrofit applications of just about any hot water boiler • Typical energy savings is about 14% with some customers experiencing up to 30%
POWER IN 24 VAC
Features
6 AMP
INPUT 120 VAC
$600 $500
Savings Range
$400 $300
BOILER RELAY
$200 $100
ZONE 1 120 VAC
$0
N H N H
$0
$1000
$2000
$3000
$4000
Yearly Amount Spent on Fuel POWER INPUT
N
(120 VAC) H TRANSFORMER
POWER INPUT CONNECTIONS
CIRCULATOR OUTPUT CONNECTIONS
SYSTEM CIRCULATOR (OPTIONAL)
MULTI-ZONE INSTALLATION WITH ZONE CONTROL, WITH INDIRECT DHW
FUSE
The installer must ensure that this control and its wiring are isolated and/or shielded from strong sources of electromagnetic noise. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
Taco Inc., 1160 Cranston Street. Cranston, RI 02920 / (401) 942-8000 / Fax (401) 942-2360 Taco (Canada) Ltd., 8450 Lawson Road, Unit #3, Milton, Ontario L9T 0J8 / (905) 564-9422 / Fax (905) 564-9436 www.taco-hvac.com
