Taco FuelMizer SR501-OR-4 Instruction Sheet

ond sensor can be placed alongside the one to be tested and the read-
ings compared. First measure the temperature using the thermometer
and then measure the resistance of the sensor at the control. The wires
from the sensor must not be connected to the control while the test is
performed. Using the chart below, estimate the temperature measured
by the sensor. The sensor and thermometer readings should be close.
If the test meter reads a very high resistance, there may be a broken
TEMPER TURE RESIST NCE TEMPER TURE RESIST NCE
°F °C °F °C
-30 -34 234,196 30 -1 34,558
-20 -29 165,180 40 4 26,099
-10 -23 118,018 50 10 19,900
0 -18 85,362 60 16 15,311
10 -12 62,465 70 21 11,883
20 -7 46,218 80 27 9,299
TECHNIC L D T :
SR501-OR Boiler Reset Control Relay:
Control: Microprocessor PI control. This is not a
safety (limit) control.
Enclosure: TYPE 1
1 1 3
Dimensions: 4 ⁄ " W x 5 ⁄ " H x 2 ⁄ " D
4 4 4
pprovals: UL listed for US and Canada, Temperature
Indicating and Regulating Equipment.
Power Supply: 120/60/1 V C, 12 amps maximum
The installer must ensure that this control and its wiring are isolated
and/or shielded from strong sources of electromagnetic noise.
device complies with part 15 of the FCC Rules. Operation is subject to
W RNING: Wiring connections must be made in accordance with all applicable electrical codes. Use copper wire only. 120 V C wiring must have a
minimum temperature rating of 75°C. Failure to follow this instruction can result in personal injury or death and/or property damage. 12-18 gauge wire
recommended for 120 V C connections, 14-22 gauge wire for thermostat connections, and 14-22 gauge wire for 24 V C source connections.
LIMITED W RR NTY ST TEMENT
Taco, Inc. will repair or replace without charge has been subject to misuse, misapplication, the
(at the company's option) any product or part addition of petroleum-based fluids or certain
which is proven defective under normal use chemical additives to the systems, or other
within three (3) years from the date of start-up or abuse, will not be covered by this warranty.
three (3) years and six (6) months from date of
If in doubt as to whether a particular substance
shipment (whichever occurs first).
is suitable for use with a Taco product or part, or
In order to obtain service under this warranty, it for any application restrictions, consult the
is the responsibility of the purchaser to promptly applicable Taco instruction sheets or contact
notify the local Taco stocking distributor or Taco Taco at [401-942-8000].
in writing and promptly deliver the subject prod-
Taco reserves the right to provide replacement
uct or part, delivery prepaid, to the stocking dis-
products and parts which are substantially sim-
tributor. For assistance on warranty returns, the
ilar in design and functionally equivalent to the
purchaser may either contact the local Taco
defective product or part. Taco reserves the
stocking distributor or Taco. If the subject prod-
right to make changes in details of design, con-
uct or part contains no defect as covered in this
struction, or arrangement of materials of its
warranty, the purchaser will be billed for parts
products without notification.
and labor charges in effect at time of factory
T CO OFFERS THIS W RR NTY IN LIEU OF
examination and repair.
LL OTHER EXPRESS W RR NTIES.
ny Taco product or part not installed or operat-
W RR NTY IMPLIED BY L W INCLUDING
ed in conformity with Taco instructions or which
W RR NTIES OF MERCH NT BILITY OR FIT-
®
Do it Once. Do it Right.
T CO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000
T CO (Canada), Ltd., 8450 Lawson Road, Unit #3, Milton, Ontario L9T 0J8.
Visit our web site at: http://www.taco-hvac.com
wire, a poor wiring connection or a defective sensor. If the resistance
is very low, the wiring may be shorted, there may be moisture in the
sensor or the sensor may be defective. To test for a defective sensor,
measure the resistance directly at the sensor location.
TEMPER TURE RESIST NCE TEMPER TURE RESIST NCE
°F °C °F °C
90 32 7,334 150 66
100 38 5,828 160 71
110 43 4,665 170 77
120 49 3,760 180 82
130 54 3,050 190 88
140 60 2,490 200 93
Relays: Boiler Relay 1 amp @ 24 V C
Circulator Relay 1 ⁄ HP (6 FL , 36 LR )
3
Thermostat: 24 V C Class 2 Output
Sensors: NTC thermistor, 10 k @ 77°F
(25°C ±0.2°C) ß=3892
Outdoor Design Temp.: -30°F to 40°F (-35°C to 5°C)
Boiler Minimum: 70°F or 140°F (21°C or 60°C)
Differential: 10°F or 20°F (6°C or 12°C)
WWSD: 70°F (21°C), blinks TST T light when >70°F
the following two conditions: (1) This device may not cause harmful inter-
ference, and (2) this device must accept any interference received,
This
including interference that may cause undesired operation.
NESS IS IN EFFECT ONLY FOR THE DUR TION
OF THE EXPRESS W RR NTY SET FORTH IN
THE FIRST P R GR PH BOVE.
THE BOVE W RR NTIES
LL OTHER W RR NTIES, EXPRESS OR
ST TUTORY, OR NY OTHER W RR NTY
OBLIG TION ON THE P RT OF T CO.
T CO WILL NOT BE LI BLE FOR
CI L, INCIDENT L, INDIRECT OR CONSE-
QUENTI L D M GES RESULTING FROM THE
USE OF ITS PRODUCTS OR NY INCIDENT L
COSTS OF REMOVING OR REPL CING
DEFECTIVE PRODUCTS.
This warranty gives the purchaser specific
rights, and the purchaser may have other rights
which vary from state to state. Some states do
not allow limitations on how long an implied
NY warranty lasts or on the exclusion of incidental
or consequential damages, so these limitations
or exclusions may not apply to you.
F X: (401) 942-2360.
Telephone: 905/564-9422. F X: 905/564-9436.
SUPERSEDES: June 1, 2012
Plant ID# 9300-2871
PPLIC TION:
2,045
The SR501-OR is a microprocessor-based control designed to regulate
the supply water temperature of a single boiler, based on the outdoor
1,689
temperature. The SR501-OR is a boiler reset control and switching relay
1,403 in one unit. The SR501-OR is ideal for retrofit application, but may also
be used in new installations as well.
1,172
The SR501-OR includes functions such as automatic reset ratio calcu-
983
lation, warm weather shut down (WWSD), minimum boiler temperature
setting, and boiler differential setting. The control also has boiler sensor
829
and outdoor sensor error checking.
24 VAC
THERMOSTAT
BOILER
CONTROL
OFF ON
SW1
DESIGN OUTDOOR
TEMPERATURE
FOR 180°F SUPPLY
TEMPERATURE
0
-10 10
-20 20
-30 POT1 30
OFF 40
POWER
INPUT
(120 VAC)
ONE ZONE INSTALLATION W/O INDIRECT DHW
CONTROL STR TEGY:
Outdoor Reset:
RE IN LIEU OF
In order to properly control a hot water heating system, the heat sup-
plied 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.
NY SPE-
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 tem-
perature, as well as other factors. s the outdoor temperature
drops, the building heat loss increases.
Reset Ratio:
Operation of a hot water heating system can generally be improved by
modulating the supply water temperature as the outdoor temperature
changes. Using this approach, the heat lost from the building is
matched by the heat input to the building. The SR501-OR boiler reset
control utilizes a reset ratio to set the relationship between outdoor
temperature and supply water temperature. The reset ratio determines
the amount the supply water temperature is raised for every 1° drop in
outdoor air temperature, and it is determined from the starting point
and the system design conditions. In order for the control to automat-
Printed in US
ically determine the reset ratio, outdoor design conditions must be
Copyright 2012
established. This is usually the typical coldest outdoor temperature
T CO, Inc.
or it can be set by using
Temperature for specific geographic locations.
Instruction Sheet
™
FuelMizer SR501-OR-4 Switching Relay with Outdoor Reset
OUTDOOR
SENSOR
BOILER
SUPPLY
SENSOR
BOILER
CONTROL
OFF ON
X X R W C R W
OUTDOOR SUPPLY
SENSOR
SENSOR
BOILER TSTAT DHW
SW1
DESIGN OUTDOOR
ONE ZONE
TEMPERATURE
SWITCHING RELAY FOR 180°F SUPPLY
LED
TEMPERATURE
WITH OUTDOOR RESET INDICATORS
-10
-20
POWER
-30
OFF
TSTAT
DHW
OVERRIDE
BOILER
6
RELAY
AMP
INPUT ZONE 1
120 VAC 120 VAC
N H N H
N
SYSTEM
H
CIRCULATOR
(OPTIONAL)
MULTI-ZONE INSTALLATION WITH ZONE CONTROL, WITH INDIRECT DHW
BOILER SUPPLY TEMPERATURE vs. OUTDOOR TEMPERATURE (°F)
90
SH RE standards for Design Outdoor
102-431
EFFECTIVE: July 1, 2012
THERMOSTATS
DHW
A
(24VAC)
AQUASTAT
ZONE 3
PRIORITY
X X R W C R W C R W C ON
ZONE 1 ZONE 2 ZONE 3
ISOLATED
OFF LED
END SWITCH THERMOSTATS PRIORITY
INDICATORS
POWER
EXISTING T STAT 1 VALVE 1
ZONE VALVE CONTROL
T STAT 2 VALVE 2
T STAT 3 VALVE 3
24 VAC ZONE VALVES PRIORITY
ZONE 1 ZONE 2 ZONE 3
PUMP END ZONE 3 PUMP
SWITCH END SWITCH
1 2 3 4 1 2 3 4 1 2 3 4
X X N/O COM N/C
JUMPER
1 1
3 & 4
2 2
2 WIRE ZONE VALVE 3 3
(NO END SWITCH)
TACO 3 WIRE TACO 3 WIRE
MUST USE JUMPER
ZONE VALVE ZONE VALVE
OUTDOOR
SENSOR
BOILER
SUPPLY
SENSOR
X X R W C R W
OUTDOOR SUPPLY
SENSOR SENSOR
BOILER TSTAT DHW
0
10
ONE ZONE
20
SWITCHING RELAY
LED
POT1 30
INDICATORS
WITH OUTDOOR RESET
40
POWER
TSTAT
DHW
OVERRIDE
BOILER
6
RELAY
AMP
INPUT ZONE 1
120 VAC 120 VAC
N H N H
POWER N
INPUT
SYSTEM
(120 VAC) H
CIRCULATOR
(OPTIONAL)
FOR OUTDOOR DESIGN TEMPERATURES
210
40 30
0
20
10
-10
190
180
-20
170
-30
150
130
110
90
70
80 70 60 50 40 30 20 10 0 -10 -20
OUTDOOR TEMPERATURE (°F)