Installation, Operation and Maintenance Instructions User guide
MagnaTherm Boilers and Water Heaters
Page 37
CONDENSATE
R1
4 78
COM 1 COM 2
123 65
DISPLAY
ACB
J3 MB1
120 VAC
24 VAC
J5-1
INTERLOCK
T3
T2 T1
L3 L2 L1
VFD
BLOWER
MOTOR
1
(+)
(-)
2
243 1243 1 243 1
VTB5
VTB4
VTB1
24VAC POWER
VARIPRIME
COM
N/C
N/O
(OPTIONAL)
ENCLOSURE
3
1
2
VTB2
VTB6
VTB3
4
HSI
R-4
PILOT
J1-3
FLAME
ROD
R2
MAIN
CIRCUIT BREAKER
T1
L1
CONTACTOR
L3 L2
T2T3
R2
CONVENIENCE
RECEPTACLE
FUSE
FUSE
MAIN SWITCH
+
-
110 VAC
NAMEPLATE
VOLTAGE
6 25 4 11 13A 13B13C 14 30 16 17
BLOCK FLUE
SWITCHES
VFD
TB 1-44
TB 1-45
1
25
*
4
OUTLET
WATER
INLET
WATER
J8-8
J8-9
J8-4
J8-10
J8-5
3
2
1
2
L3
GND
BLOCK FLUE
SWITCHES
LWCO
J7-2
HIGH GAS
PRESSURE SW
_
_
+
+
FIELD CONNECTION 3 PH POWER
L2
L3
GL1
J6-2
J6-1
OPTIONAL
ADDITIONAL
HIGH LIMIT
J7-5
THERMAL CUT-OUT
PROBE
LOW GAS
PRESSURE SW
J7-3
INLET
SENSOR
OUTLET
SENSOR
R4
TB1-29
TB1-30
MANUAL RESET
HIGH LIMIT
CONDENSATE
R3
J7-4
J7-6
J5-3
J4-10
J5-2
UNIT TEMPERATURE
SENSORS
J5-7
J4-8
P1
P2
2
J8-2J8-3
J8-1
VARIPRIME PUMP CONTROL
MOUNTED ON
HYDRONIC UNITS ONLY
VFD TERM 5
VFD TERM 2
120 NEUTRAL
(VARIPRIME ONLY)
VTB 3-4
VTB 3-3
MB2-B
J10-1
-
J10-8
R3
VARIPRIME
ONLY
-
+
-
+
+
4-20 ma (+)
+
-
J10-5
0-10VDC (+)
45
44
43
4-20 ma
0-110VDC (-)
J10-6
DISPLAY #6
MB2-A
MB2-C
J10-3
PUMP
0-10V
DHW
SENSOR
COM 2
MB2
REMOTE RESET
30
29
31
32
33
34
DISPLAY #4
35
36
37
38
39
40
42
41
TOD FEED
J10-2
J6-8
J6-7
ALARM
27
28
26
25
+
24
23
22
21
TB1-4A
20
19
18
17
15
16
FIELD
CONNECTIONS
TT
ANALOG
OUTDOOR
SYSTEM
DHW
PUMP
SYSTEM
PUMP
BOILER
PUMP
J8-3
TB1-13
J8-6
J8-7
J8-11
J8-12
J4-2
J4-4
TB1-4A
TB1-4A
J4-6
VFD-16 VFD-17
*
*
J4-2
J4-4
J4-6
TB1-4A
TB1-4A
J6-3
R1
120V+
120V-
120V-
120V+
120V-
120V+
FLOW SWITCH
TB1-35C
TB1-34C
TB1-33C
STACK
J9-4
J9-5
J9-6
3
2
4
1
BOILER
PUMP
SYSTEM
PUMP
DHW
PUMP
TB1-4A
NOTE:
WHEN AN OPTIONAL COMPONENT IS NOT PRESENT,1.
THE SIGNAL MUST BE JUMPED
= USED ON SIZE 4.0 MMBh ONLY2.
L1
L2
J5-6
J10-7
J9-1
J9-2
DISPLAY #5
J10-4
1
.010
E23518
D
C
B
A
B
C
D
1
2
3
4
43
DRAFT
S
PROPRIETARY TO LAARS HEATING SYSTEMS AND SHALL NOT BE
2
BY LAARS HEATING SYSTEMS.
RECEPTACLE & FUSE.
DWG NO.
E23518
SH
FMA56A
1
REV
AL 2-10-14
REVISIONS
REV.
CHANGE:
APPR
ENGR APPR
ECN
PURPOSE EXCEPT AS SPECIFICALLY AUTHORIZED IN WRITING
B
LADDER DIAGRAM, MGT, 3 PHASE
1/8"
14-002N-13
JM 2-10-14
SCALE: NONE
INTENDED SIZE:
SOFTWARE
B
C
SHEET 1 OF 1
REV.
APPROVALS
DRAFT
ENGR
APPR
CHECK
REPRODUCED, TRANSFERRED TO OTHER DOCUMENTS, USED OR
DISCLOSED TO OTHERS FOR MANUFACTURING OR ANY OTHER
DIMENSIONS ARE IN INCHES.
TOLERANCES ARE:
DWG. NO:
MATERIAL:
FINISH
NA
NA
CJT 1/17/14
JM 1/17/14
UNLESS OTHERWISE SPECIFIED:
SHOW R2 COIL ON CONTACTOR. ADD CONVENIENCE
THIRD ANGLE PROJECTION.
DO NOT SCALE DRAWING.
.1 DECIMALS .X
TITLE:
DECIMALS .XX
1
.03
DECIMALS .XXX
THIS DOCUMENT AND THE INFORMATION CONTAINED HEREIN ARE
ANGLES
FRACTIONS
B
8.7 Ladder Diagrams
Figure 19. Three-Phase Ladder Diagram