Neptune G-50-1, G-50-1A, G-50-2A, G-100-1A, G-100-2A Operating Instructions Manual

OPERATING &

Models G-50-1, G-50-1A, G-50-2A, G-100-1A, G-100-2A

Lansdale, PA 19446 Tel: [phone] Fax: [phone]

REV NO 6 – 01/08/04

ZL106838

INSTRUCTION

MANUAL

NEPTUNE

GLYCOL FEED SYSTEM

I.

GENERAL DESCRIPTION

Neptune Chemical Pump Company’s Glycol Feed System is intended for the automated
addition of glycol into closed loop chille d and hot water syste ms. The Glyco l Feed System
automatically maintains pressure in the loop by adding glycol solution to make up for
losses, which occur due to leakage.

Glycol addition is controlled by a pressure switch with adjustable low and high set points.
When the pressure in the loop reaches the low set point, the pump begins to feed glycol
into the system until the high set point pressure is achieved and stops the pump.

I.

MODELS

The Model G-50-1 or G-100-1 is provided with a 50 or 100 gallon polyethylene tank
mounted in a steel frame, 1.5 gpm bronze rotary gear pump (optional 3.0 gpm pump), float
switch and NEMA 4X control panel. The control panel features a HAND/OFF/AUTO
selector switch for the pump motor, ON indication light for the pump, LOW tank level
indication light and power cord with plug (115V, 60c). The pump suction piping includes
a PVC ball valve and cast iron “Y” strainer. The pump discharge assembly includes a PVC
ball valve, brass check valve, pressure switch, bronze relief valve and pressure gauge.

The Model G-XX-1A is identical to the G-XX-1 and has the addition of an audible
alarm, as well as light for low level tank indication.

The Model G-XX-2A is capable of feeding glycol to two separate closed loop systems
and includes two separate pumps, as well as suction and discharge assemblies.

The LP designation at the end of a model number (ex. G-XX-1-LP) indicates that a 3.0
gpm pump has been provided in place of our standard 1.5 gpm pump.

All glycol systems are provided with a dry contact for remote alarm.

II.

OPERATION

The glycol feeder is provided with a control panel with HAND/OFF/AUTO selector
switch.

When the panel is switched to the AUTO position, the pump is actuated via the pressure
switch, which is mounted in the discharge assembly and sensing the pressure in the loop.
The pressure switch is pre-set to start the pump at 12 psi and stop the pump when 30 psi in
the loop is achieved. The adjustment range for the standard pressure switch is 10-45 psi to
start the pump and 20-60 psi to stop the pump. The minimum differential pressure
between the cut in and cut out set points is 10 psi and the maximum is 30 psi. The float
switch in the bottom of the ta nk will stop t he pump if the glyc ol solution in the tank gets to
low leve l.

The MANUAL position of the selector switch in the panel will allow the pumps to run and
inactivate both the pressure switch and the level switch.

PLEASE READ THIS

The initial settin g of the pre ss ur e swit ch is crit ica l
to the proper operation of the glycol feeder.

The pressure relief valve is factory set at 60 psi.
DO NOT operate the glycol feeder above 100 psi.
If your application requires a higher operating
pressure, consult the factory.

WARNING

TROUBLESHOOTING

PROBLEM

PROBABLE CAUSE

Pump is running but is 1. The motor rotation is incorrect. The
not pumping anything proper rotation of the motor is counter-clockwise when

looking at the motor shaft. Check the wiring diagram
on the motor or t he a tta ched motor diagram for prop e r
wiring.

2. On simplex single pump systems – Model G-XX-1 and
G-XX-1A. The motor should be wired for 115V
counter-clockwise rotation. See further information on
the pump, which is attached.

3. Duplex or two pump systems, Model G-XX-2A, require
one pump motor to be wired counter-clockwise and the
other in a clockwise rotation. Looking at the front of
the Model G-XX-2A, the control panel facing you, the
pump motor on the left should be wired counter­clockwise and the pump motor on the right should be
wired for a clockwise rotation.

Pump is not running when 1. The low level float switch may be
HOA switch is in the AUTO actuated. The low light will be on a nd
position the audible alarm will sound on some

models. Add glycol to the tank until
the leve l s w it c h is sa tisf ie d.

2. The pressure switch in the discharge piping has been
satisfied. The press u re s w itch is factory set to ac tuate
the pump at 12 psi and shut-off at 30 psi. See pressure
switch information for pressure switch adjustment,
which can be found on the inside cover of the pressure
switch.