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Vaporless Manufacturing, Inc.
8700 East Long Mesa Drive, Prescott Valley, Arizona 86314
800-367-0185 928-775-5191 Fax: 928-775-5309
Email: [email protected] Web Site:
www.vaporless.com
ENCLOSURE & MOUNTING:
The module is designed for operation in a non-hazardous, indoor environment such as an
equipment room. Holes are provided in the base for mounting the unit. Two holes are provided for
the connection of ½” conduit fittings. A hole plug is provided for closing an un-used conduit hole.
ELECTRICAL CONNECTIONS:
The best way to understand the operation of the ARM-4073 is to look at the device as though it
were an additional dispenser being installed at the site. All dispensers typically have a 120 VAC
power source being supplied to them.
The ARM-4073 MUST be supplied with the same phase
power as the dispenser(s).
After determining the 120 VAC power source of the dispensers, land
the 120 VAC (hot) on terminal L1 of the ARM-4073 and the (neutral) on terminal L2 of the ARM-
4073. Next, make a small jumper wire (minimum 16 AWG wire) that will land on terminals L1
and K1.
All dispensers have an authorization signal output that goes to some device that engages the turbine
pump. In some instances, this signal may go directly to the A1 terminal on the pump contactor
coil. That said, look at terminal K2 on the ARM-4073 as though it were another authorization
signal output from a dispenser and connect terminal K2 to where all the other authorization output
signal wires terminate. It makes no difference whether the turbine(s) at your site are single phase
or three phase. The ARM-4073 only controls the coil on the turbine contactor, just as any other
authorization signal would. The vast majority of installations for the ARM-4073 can be described
with Figure 1 located on page 10 of this manual. If you feel that your site is unique in some way,
please do not hesitate to consult with VMI for technical support.
1.
Authorization signals are generally powered from a 120 VAC source. Because this signal is
derived from one of the phases of the main STP power source, there should be zero volts
between the signal side of the contactor’s coil when it is powered and one phase of the power
mains. Using a voltmeter, determine which phase exhibits this condition.
Though unlikely, please note that the source of the authorization control signal is not always
apparent. It could be derived from a source that does not exhibit the characteristics noted in the
previous paragraph.
Note: It is the responsibility of the installer to determine the appropriate
signal (phase) supplied to the ARM-4073. Selecting the incorrect phase will likely cause
equipment damage and/or injury to the installer.
2.
Connect terminal L1 on the ARM to 120 VAC dispenser power, and L2 terminal to neutral.
3.
Connect terminal K2 on the ARM to the authorization signal side of the contactor’s coil or
other device that relays a signal to the turbine pump contactor (i.e., DHI, ATG, etc.).
4.
Assuming you are powering the ARM-4073 with the same 120 VAC phase as the authorization
signal, place a jumper wire between terminals L1 & K1 (16 AWG minimum wire size). Please
see Figure 1 (wiring diagram) on page 10 of this document.
