T e c h n o l o g y , L L C
DIESEL PRO
®
245
TECHNICAL MANUAL FOR DTNA
6
www.davco.com
800-328-2611
Saline, MI 48176
P. O. Box 487
DAVCO Technology, LLC
F1353 REV B
12VDC AND 24VDC PRE-HEATER INSTALLATION
Pre-heater Wiring with Relay
85
30/51
87
86
12/24 VDC
OPTIONAL
RELAY
+
-
Heater
Pre-heater Fuse
Harness
Connector
Ignition
Circuit
Fuse
87A
87
86
85
30/51
1. Open the vent cap. Open the drain valve by turning one to
one and a half revolutions. Drain the Diesel Pro complete-
ly. Close the drain valve.
HEATER PORT
2. Remove the plug from the pre-heater port.
3. Apply liquid thread sealant to the pre-heater threads and
install into the bottom plate. Tighten to 15-30 ft-lbs.
4. Connect the chassis harness to the Diesel Pro harness.
5. Connect the power lead to the fused accessory side
of the ignition switch. The fuse rating depends on the
pre-heater installed.
Approved fuse ratings
•
12VDC System:
-
20 amp fuse for a 155W PTC Pre-heater
-
25 amp fuse for a 195W PTC Pre-heater
•
24VDC System:
-
15 amp fuse for a 195W PTC Pre-heater
If the keyed circuit will not handle the required amperage for
the pre-heater, use a relay. Prime the Diesel Pro (see page 5)
and check for leaks.