Lochinvar 000 through 2 - Manual (Page 77)

77
Ladder Diagram
1,500,000 - 1,300,000 - 2,000,000 Btu/hr Models
J3
5
4
6
1
2
3
O.C.
J1
J2
3 2 1 J4
P
RESET
RESET
CHASSIS
GROUND
GND
PU
G
PU
BL Y
24 VAC
LWCO
PROBE
T
~~~~~~~~ ~~~~
OA SENSOR
INLET SENSOR
REAR
COMMUNICATION
CABLE CONNECTION
CONTROL PANEL
COMMUNICATION
CABLE CONNECTION
BYPASS
VALVE
NO
COM LOUVER
RELAY
CONTACTS
R
STD.
VFD POWER
RELAY
NO
COM
NO C
POWER
SWITCH
N
R
3
2
7
VFD M BLOWER
ASSEMBLY
S1
L1
L2
S2
120VAC GAS VALVE
NO
COM
NO
COM
EXT. GAS VALVE
VENT VALVE
OPTIONAL
24 VAC
LOW VOLTAGE
TRANSFORMER
120
VAC
Back Select
COMMAND DISPLAY
EBUS EBUS
EARTH 24VAC 24VAC
NC
COM
NC
HI-LIMIT ALARM
RELAY
COM
OVER TEMP
INDICATOR
R
24VAC SOLENOID VALVE
F2
F1
-
+
IGNITION
MODULE
11
10
9
6
4
3
2
1
N/A
TH
PI
LV1
PS
FF
M/S
FF
LV2
RESET
8
7
5 MV
IGNITION
RESET
OPTIONAL
Louver
Proving Sw
Low
Gas
High
Gas
Blocked
Drain
NO
NC
C
NO
NC
C
NC
NO
C
NO
NC
C
NO
NC
C
NO
NC
C
OPTIONAL
IGNITION
MODULE
NO COM
R
HOT
SURFACE
IGNITER
VFD
ENABLE
J3
5 1
4 1
3 1
2 1
4
3
2
1 E G ND
GN
D
A1
-3
O HM
G ND
G N D
22 V DC
O UT
E -B
U S
DI -4
GN
D
DI
-3
DI
-2G
ND
2 O U T
3 OU
T
5 OU
T
1 OU
T
4 O UT
6 OU
T
7 OU
T
E -B
U
S
J AC
K
A1
-1
O HM
A1
-2
OH
M
A1
-4
OH
M
A1
-5
V /m
a
A1
-6
V /m
a
DI
-1
24 VA
C
2 4
VA
C
CO
M
8 O UT
LED
Inlet Water Sensor
Bypass Water Sensor
S/S
OA Sensor
LowAir/Block Drain
Hi-LoGas/
Louver
Outlet Water Sensor
Flame Failure
Low Wtr Flow
Gas Valve
HSI 1
2
3
1
2
1
2
1
2
1
2
3
4
5
BYPASS
SENSOR
OUTLET
SENSOR
INLET
SENSOR
ENABLE
SWITCH
OA
SENSOR
2
1
CHASSIS
GROUND
RUN/STOP SWITCH
24VAC
HSI
1 2
2 3
4 5 6
7 8 9
1
1 2 3
6
5
78
9
10
11
31
30
2 9
28
26
2 7
25
2 4
23
22
21
20
19
1 8
17
16
BYPASS SENSOR
COMMUNICATION
CABLE #2
BK BK
PWM/4-20ma
Dial Alarm
Float Close
Float Open
Ignition Enable
n/a
Pump Relay
n/a
CONTROLLER
INPUTS
INPUTS
1
1
1 1 1
1 2 3
G
OUTLET
SENSOR
OUTPUTS
1
1 2
NO
COM
PUMP RELAY
PUMP MOTOR
PUMP POWER
120VAC 15AMP
NO
COM
NO
ALARM RELAY
COM
ALARM
CONTACTS
ALARM
24VAC OUT
ALARM
INDICATOR
SILENCE SWITCH
R
STD.
STD.
MO DE TIM E BAS E MU X ADD R MA
NU
A
L OV
E R -
RI DE
SI
G
I N
-
SI
G
I N
+
24
V
Pw
r
Co
m mA
Ou
t
Vo
lt
s O
u
t
Vo lts Out mA Out Co m 24 V Pw r SIG + SIG -
PWM
CONV.
DIP SWITCH #5 ON
NOTICE:
FACTORY
CALIBRATED .
DO NOT
ADJUST .
T3
T2
T1
IGNITION RELAY
HI-LIMIT
UNIT POWER 120VAC 15AMP
COMMUNICATION
CABLE #1
2
GAS VALVE RELAY
AIR
SWITCH
FLOW
SWITCH
CONTROLLER HSI
1 2
GROUND
CONTROLLER 24VAC
1 2
1 2 3
CONTROLLER INPUTS
1 2 3 4 5 1 2 3 4 5
CONTROLLER
INPUTS
2 3
4 5 6
7 8 9
1 R
CONTROLLER OUTPUTS
LOUVER RELAY
CONTROLLER
VFD 1 2 3
HOT NEUTRAL
GROUND
GROUND
2
GROUND
1
1 3
3
G
L1
L2
GND
R
LV1 LV2
PUMP
ENABLE
GAS
ON
FLOW
FLAME
FAILURE
OPTIONAL
BLK DRAIN
LO AIR
LOUVER
GAS HI/LO
LBL20021 REV B
8888
PROG
VOLTS AMPS HERTZ
RUN FWD REV
L1 L2 T1 T2 T3
S
N
K
S
R
C
01 02
14 11
DIP SWITCH IN
DOWN
POSITION
15
WARNING: To avoid possible shock hazard, disconnect power before servicing.
TEST
SWITCH
PU
T
T
24 VAC
LWCO
O
O/BK
M
OPTIONAL:
50 Hz Limit Resistor
1.2K Ohm
OVERRIDE TOGGLE SWITCH
TO PUMP
RELAY COIL
TO
OVERRIDE
TOGGLE
SWITCH