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SR503-EXP
Taco SR503-EXP User Manual
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69
T
aco Low W
ater Cutoff R
eplacement Guide
Bold / Italics Indicates Discontinued Part Number
T
aco
McDonnell & Miller
Hydrolevel
Honeywell
LF
A1203S-1
L
T
A1203N-1
L
T
A1203S-1
PS-801-120
PSE-801-120
PS-800-120
PS-850-120
900
900C
450
CG450
CGT450
OEM170TD
RW700A1031
RW700A1056
RW700A1080
LFM1203S-1
L
TM1203N-1
L
TM1203S-1
PS-801-M-120
PS-851-M-120
PS-851-SP-M-120
PS-850-M-120
900M
901M
902M
550
550SV
750
OEM170MC
OEM170M
RW700B1054
RW700B1039
RW700B1021
LF
A0243S-1
L
T
A0243N-1
L
T
A0243S-1
PS-802-24
PSE-802-24
PS-800-24
PS-850-24
400
CG400
OEM24TD
RW700A1098
LFM0243S-1
L
TM0243N-1
L
TM0243S-1
PS-802-M-24
PS-852-M-24
PS-852-SP-M-24
PS-850-M-24
500
500SV
700
OEM24MC
LF
A1203R-1
L
T
A1203R-1
750-T
-120
750-120
650R
LFM1203R-1
L
TM1203R-1
750-MT
-120
750-M-120
550R
LF
A1202R-1
L
T
A1202R-1
PS-851-RX2-120
650R
LFM1202R-1
L
TM1202R-1
PS-851-M-RX2-120
550R
LF
A0242R-1
L
T
A0242R-1
PS-802-RX2-24
400R
L
T
A0243S-2
LNA0243S-1
PS-852-24
PS-852-SP-24
750-MT
-SP-24
750P-MT
-24
750P-MT
-U-24
24
24SV
600
600SV
OEM24C
L
T
A1203S-2
LNA1203S-1
RB-120
RB-122E
PS-851-120
PS-851-SP-120
750P-MT
-120
750P-MT
-SP-120
750P-MT
-U-120
901
RB-120II
RB-122
170
170SV
1150
650
650SV
OEM170C
OEM170
RW700A1007
RW700A1006
L
TR0243T
-1
RB-24E
RB-24
1100
P3R-1
RS-1-BR-1
RS-1-LP
RS-1-LP-S
EL1214-R
EWF120
WFE-120
WF2-U-120V
WF-2-120
WF-4-120
VRTX-120
V-120-1&2
VW400A1004
EWF024
WFE-24
WF2-U-24V
WF-2-24
WF-4-24
VRTX-24
V-24-1&2
VW800A1004
70
72
Table of Contents
Table of Contents
1
Product Information
3
Switching Relay Wiring
4
Safety Notice
5
How to Check for Two Power Sources
5
How to Correct the Wiring
5
Table of Contents
6
Switching Relay Controlling Another Switching Relay
7
Two Switching Relays Connected Together
9
Vac 120V Relay Power
9
End Switch
9
Fuse 1 Amp
9
Priority Zoning Circulator Controlling Switching Relay
10
Vac Input
14
Vac
14
SR501-EXP Switching Relay Controlling a ZVC404/406 Zone Valve Control
15
2 Expandable Switching Relays Connected Together
16
Zc Zr
16
Volt Circulators Input
16
Zone1 Zone2 Zone3 Zc H X1 Zr
16
Fuse 1 Amp
16
Volt Circulators
16
Vac Input
16
2 Indirect Water Heaters Connected to Standard Switching Relays
17
2 Indirect Water Heaters W/ Priority Connected to EXP Switching Relays
18
PC700 Boiler Reset Control Connected to SR501-EXP Switching Relay
19
SR501-EXP/PC700 Boiler Reset Control Connected to a Switching Relay
20
Connecting a DHW Heater to an Existing Heating Only Switching Relay
20
Thermostat
20
SR501-EXP/PC700 Boiler Reset Control Connected to a Zone Valve Control
21
Connecting a DHW Heater to an Existing Heating Only Zone Valve Control
21
SR501-EXP/PC700 Boiler Reset Control Connected to Tankless Coil Boiler
22
PC700 Boiler Reset Control Connected to EXP Switching Relay
23
PC702 2–Stage Boiler Reset Control Connected to EXP Switching Relay
24
PC705 Pump Injection Control Connected to EXP Switching Relay
25
PC700 Boiler Reset Control Connected to 2 EXP Switching Relays
26
PC702 2–Stage Boiler Reset Control to 2 EXP Switching Relays
27
PC705 Pump Injection Control Connected to 2 EXP Switching Relays
28
PC700 and PC705 Controls Connected to 2 EXP Switching Relays
29
PC702 and PC705 Controls Connected to 2 EXP Switching Relays
30
ZVC403/405 with System Pump
31
ZVC404/406 with System Pump
32
ZVC404/406 with Domestic Hot Water (DHW) Pump
33
ZVC404/406 with System and DHW Pumps
34
ZVC404/406 with System, DHW and Secondary Pumps
35
2 ZVC404/406 Connected Together with Priority
36
2 EXP Zone Valve Controls Connected Together with System Pump
37
2 EXP Zone Valve Controls Connected Together with DHW Pump
38
2 EXP Zone Valve Controls Connected Together with System and DHW Pumps
39
2 EXP Zone Valve Controls Connected W/ System/Dhw/Secondary Pumps
40
PC700 Boiler Reset Control Connected to EXP Zone Valve Control
41
2–Stage Boiler Reset Control Connected to EXP Zone Valve Control
42
Pump Injection Control Connected to EXP Zone Valve Control
43
PC700 Boiler Reset Control Connected to 2 EXP Zone Valve Controls
44
2–Stage Boiler Reset Control Connected to 2 EXP Zone Valve Controls
45
Pump Injection Control Connected to 2 EXP Zone Valve Controls
46
PC700 and PC705 Connected to 2 EXP Zone Valve Controls
47
PC702 and PC705 Connected to 2 EXP Zone Valve Controls
48
HAFC101 with 1 Speed Air Handler
49
HAFC101 with 2 Speed Air Handler
50
HAFC201 with 1 Speed Air Handler
51
HAFC201 with 2 Speed Air Handler
52
Multiple Hafc’s and Switching Relay
53
3 Wire Thermostat Connected to TACO Switching Relay
54
3 Wire Thermostat Connected to TACO Zone Valve Control
54
White-Rogers 1361 Hydronic Zone Valve with TACO Zone Valve Control
55
Honeywell VC 40 & 80 Hydronic Zone Valve W/ TACO Zone Valve Control
56
570 Zone Valve to Switching Relay
57
Zone Valve Control Using Priority Zoning Circulator
58
Radiant Mixing Block (RMB)
59
Radiant Mixing Block, Single Zone
59
Radiant Mixing Block Connected to Zone Valve Control
60
Radiant Mixing Block Connected to 2 EXP Switching Relays with DHW Pump
60
X - Pump Block (XPB)
61
X - Pump Block, Single Zone
61
X - Pump Block Connected to Zone Valve Control
62
X - Pump Block Connected to 2 SR502/503 Switching Relays
62
X-Pump Block
63
Typical Snow Melt Installation
63
Typical Radiant Floor to Water Heater Installation
63
Iseries Mixing Valve
64
Ivalve, 2-Way Injection, Single Zone
64
Ivalve, 3-Way Mixing Working with Switching Relay with DHW Priority
65
Ivalve, 4-Way Mixing Working with Zone Valve Control
65
Wiring for Boilers with Honeywell Control Center
66
Wiring Boilers with a United Technologies Integrated Control Module
67
Wiring Boilers with a United Technologies Ucontrol
67
Wiring Taco LN and LTA-2 Series Low Water Cutoffs
68
Wiring Taco LT Series (1St Generation, -1) Low Water Cutoffs
69
Wiring Taco LF Series Low Water Cutoffs
70
Taco Low Water Cutoff Replacement Guide
71
Taco LF Series 120 Volt LWCO Competitive Wiring Cross Reference
72
Taco LF Series 24 Volt LWCO Competitive Wiring Cross Reference
73
Taco LTA-2 Series 120 Volt LWCO Competitive Wiring Cross Reference
74
Taco LTR/LTA-2 Series 24 Volt LWCO Competitive Wiring Cross Reference
75
Wiring Taco LF Series Low Water Cutoffs to Taco Electric Water Feeder
76
Wiring 24VAC Electric Water Feeder to Taco LF Series Low Water Cutoff
77
Wiring 24VAC Low Water Cutoff to Uni-Match Electric Water Feeder
78
Wiring 120VAC Low Water Cutoff to Uni-Match Electric Water Feeder
78
Wiring 24VAC Low Water Cutoff to Hydrolevel VXT-24 Water Feeder
79
Wiring 120VAC Low Water Cutoff to Hydrolevel VXT-24 Water Feeder
79
Wiring 24VAC Low Water Cutoff to Programmable Water Feeder
80
Wiring 120VAC Low Water Cutoff to Programmable Water Feeder
80
Low Water Cutoff and Taco Electric Water Feeder Wiring Cross Reference
81
Aquastat Wiring
82
Aquastat Wiring
83
Wiring for Boilers with Honeywell Aquastat Model L8124E or Equivalent
87
Wiring for Boilers with Honeywell Aquastat Model L8148E or Equivalent
87
Aquastat Wiring to 24VAC Low Water Cutoff
88
Aquastat Wiring to 120VAC Low Water Cutoff
88
Instruction Sheet - SR501 Switching Relay
89
Instruction Sheet - SR501-845RP Universal Replacement Relay
90
Instruction Sheet - SR502 & SR503 Switching Relay
91
Instruction Sheet - SR504 & SR506 Switching Relay
92
Instruction Sheet - SR501-EXP Switching Relay
93
Instruction Sheet - SR503-EXP, SR504-EXP & SR506-EXP Switching Relay
94
Instruction Sheet - ZVC403 & ZVC405 Zone Valve Control
95
Instruction Sheet - ZVC404 & ZVC406 Zone Valve Control
96
Instruction Sheet - ZVC404-EXP & ZVC406-EXP Zone Valve Control
97
Instruction Sheet - Hydro Air Fan Controls
98
Instruction Sheet - PC600 Post Purge Timer Plug-In Powerport Card
99
PC605 Priority Protection Plug-In Powerport Card
99
PC610 Pump Exercise and Timer Plug-In Powerport Card
99
Standard Terms and Definitions
100
TACO Zone Controls Cross-Reference
101
4
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Taco SR503-EXP Specifications
General
Brand
Taco
Model
SR503-EXP
Category
Control Unit
Language
English
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