Electrical Requirements And Wiring Diagrams - Modine Manufacturing MRL Series Installation And Service Manual

MRL Series

Electrical Requirements and Wiring Diagrams

Shock hazard. Disconnect power supply before making wiring connections to prevent
electrical shock and equipment damage.
Any original factory wiring that requires replacement must be replaced with wiring
material having a temperature rating of at least 105°C minimum voltage.
All field installed wiring to the tube heater must be must be done in accordance with the national, state,
provincial, local codes, and to the guidelines in this manual. In the United States, refer to the most current
revisions to the Electrical Code ANSI/NFPA 70. The unit must be electrically grounded according to these
codes. Line polarity must be observed when making field connections.
Internal Wiring Diagram
Before wiring this appliance, check the existing wiring; replace if necessary. If any of the original wire
supplied with the appliance must be replaced, it must be replaced with copper wiring material having a
rating of at least 300 V, 105°C.
Figure 3.16 • Internal Wiring Diagram
L1 L2
BK W G
BK
G
GAS VALVE
BK
BK
LOW FIRE
INDICATOR
3.0 Installation • Electrical Requirements and Wiring Diagram
WARNING
!
G
TRANSFORMER
120V
G
Y
24V
BL
W
BL
GY
BLOWER
BK
G
BK
BK
BK
BK
HIGH FIRE P.S.
INDICATOR INDICATOR
LIGHT LIGHT LIGHT
BK
BK
BK
G
R
T'STAT
WIRE
BL
O
RESETTABLE
FUSE
O BK PR
PK
PRESSURE
BK
SWITCH
G
W
IGNITER
FLAME
SENSOR
25
• Internal Wiring Diagram
IGN/120
L1 C
IGN/240 G
L2
IGN/FS IGNITION
MODULE
PS
TH
24V
VAL
GND
*W/T-STAT WIRE
G/Y BL BR BK
G
BL
O
R
TO HEATER
LLWT10
DSRL/DSRF S
NC
LLWT106b -1