MTU 20V4000C55, Operating Instructions Manual

Page: 178 / 226

8
Industrial Pro
Installation Instructions
Installing an Optional Electric Heater
E WARNING: Fuels are combusible.
• RISK OF FIRE OR EXPLOSION:
• Avoid open flames, electrical sparks or igni-
tion sources
Do not smoke. All units come with pre-drilled ports to al-
low for pre-heaters (dual units require two pre-heaters):
Dual Tall: Four ports (two per body). (See Figure 9)
Figure 9 - Pre-heater Installation
To install, thread heater into housing and torque to 15-30
ft-lbs (20.3-40.7 N-m). Follow the wiring diagram in Figures
10 and 11.
Refer to equipment owner's manual for more specific
information related to wiring diagrams of the equipment to
which the unit will be applied.
Note: When wiring the electric preheater, use a fuse NOT a
circuit breaker.
With Relay
B
Key
Controlled
Circuit
25 A
Fuse*
Battery
Relay
85 86
87 30/51
Use a relay if the available keyed circuit
*24 V heaters use 15 A fuse
(supplied in wire harness) will not handle a minimum of 25 A.
Industrial Pro
Figure 10 - Wiring with Relay
Without Relay
B
Key Controlled Circuit
25 A
Fuse*
Battery
*24 V heaters use 15 A fuse
(supplied in wire harness)
Industrial Pro
Figure 11 - Wiring without Relay
Note:
For systems with multiple Industrial Pro
®
units, the
pre-heater power supply wiring must be split in the junc-
tion box. See Figure 12 for wiring a Dual system.
Red
Black
Junction
Box
Dual System
To Circuit or
Relay
To Industrial Pros / Preheaters
Figure 12 — Wiring Dual Filter Systems
178 | Manufacturer's Documentation | MS15043/00E 2016-04
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