F
OR
M
ODELS
: JGI, JGM, JGN, JGP
AND
JGQ
S
ECTION
4 L
UBRICATION
PAGE 4-50
a series of design enhancements and several versions are in service. The current DNFT is
shown in Figure 4-20
The DNFT works through a magnetic pin which cycles back and forth as the divider valve
piston moves, flashing the amber LED and indicating a complete cycle of the divider valve.
The DNFT operates on a field-replaceable lithium battery. If battery voltage drops below nor-
mal operating levels, the DNFT goes into shutdown mode and compressor can not be re-
started until battery is replaced.
Replacing the (Field-Replaceable) Battery in the DNFT:
1.
Shut down the compressor
2.
Disconnect wiring and loosen set screws. Remove DNFT housing to a safe
atmosphere.
3.
Use 3/8 inch ratchet wrench to remove the pipe plug.
4.
Remove battery from the DNFT and disconnect from the polarized connector.
5.
Connect the new battery (Ariel part number A-10807 or Radio Shack 960-0418)
to the attached polarized plug.
6.
Reinsert the battery and reinstall pipe plug.
7.
Replace DNFT control housing on the magnet housing to original position and
tighten set screws. Reattach wiring and conduit.
8.
Verify the DNFT is working by pre-lubing the system and check for LED blink
See the Ariel web site - vendor literature - Whitlock for more details on DNFT’s.
F
IGURE
4-20 D
IGITAL
N
O
-F
LOW
T
IMER
S
WITCH
- (DNFT)
LED
Polarized Connector
Magnet
Housing
Allen Head Set
Screws (2)
1/2” Pipe Plug
Control Housing
#22 AWG 18” (0.46 m)
Leads (7)
Magnet
Spring
Spacer
O-Ring
Field Replaceable
Battery
Ariel P/N: A-10807
Red
Red
Orange
Orange
Green
Yellow
Yellow