A.Y. McDonald Mfg. Co.
2 HP Grinder Pumps
3210-676 2/21
800.292.2737 | [email protected] | aymcdonald.com
4
INSTALLATION
The pump is provided with a leg kit in case a rail lift out system is not used. A minimum of
3” clearance must be maintained between the pump and the basin bottom. If the feet are
to be used, install the rubber threaded feet and lock with nut to ensure 3” clearance under
pump for proper clearance of solids to enter pump inlet.
Assemble discharge piping or hose assembly to the pump. Discharge piping should be
as short as possible. Both a check valve and a shut off valve are required for each pump
being used. The check valve is used to prevent backflow into the sump. Excessive backflow
can cause flooding and/or damage to the pump. The shut-off valve is used to stop system
flow during pump or check valve servicing. If pump is installed with a discharge hose
rather than a moveable fitting assembly, make sure the discharge pipe has a 1/8” hole
approximately 5” from tend nearest volute and oriented towards the pump body.
ELECTRICAL CONNECTIONS
Breaker Recommendations:
25 AMP
(208V-230V Single Phase):
20AMP
(208V-230V Three
Phase):
15AMP
(460V Three Phase). The quick connect cord assembly mounted to the pump
must not be modified in any way except for shortening to a specific application. Any supply
cables connections between the pump and the control panel must be made in accordance
with the National Electric Code or the Canadian Electric Code and all applicable state,
province and local electric codes. It is recommended that a junction box, be mounted
outside the sump or be of at least Nema 4 (EEMAC-4) construction if located within the wet
well. The Ground Wire of pump is marked with an “E” for earth ground and is a Blue-Green
Color.
DO NOT USE THE POWER OR CONTROL CABLES TO LIFT PUMP!
Check winding resistance of pump power cable before installation. The OHM readings should
be approximately: Single Phase Models: Black to White or across blades -1.3ohms; Three Phase
Models: Black to White – 1.3ohms; Red to White – 3.7ohms; Black to Red – 2.4ohms.
THREE PHASE GRINDER INSTALLATION:
Check proper rotation. Improper motor rotation can
result in poor pump performance and pump failure. The power leads are the red, black and
white wires. There should be approximately an equal ohm resistance between these leads
of approximately 1.6ohms for 230 Volt connection and 6.2 ohms for 460Volt. The bluegreen
color lead is the ground wire. Once the leads are connected to the power terminals then
you are ready to check the rotation. Momentarily apply power to the pump with it laying on
its side and impeller clear from obstruction. Observe “kickback” as it should always be in
counter-clockwise direction as viewed from top of the motor housing or opposite to impeller
rotation. If rotation is incorrect when power is supplied, then reverse two of the leads at the
power terminal and try again. This should correct the rotation. Once pump is in operation
the amperage of each leg of the power connection should be checked and recorded on
the start up sheet. They should be close to the same value for each leg (within 5% of the
average leg to leg value). If they are not, try advancing the connections to balance the
readings, but do not lose proper rotation.
If additional cord is required, consult a qualified electrician for proper wire size. On
single phase models, the type of inwinding overload protector used is referred to as an
inherent overheating protector and operates on the combined effect of temperature and
current. This means that the overload protector will trip out and shut the pump off if the
winding becomes too hot, or the load current passing through them becomes too high.
It will then automatically reset and start the pump up after the motor cools to a safe
temperature. All three phase models are not automatically protected. They do have on
winding thermal sensors accessed through the sensor cord (Black and Green wires) that
need to be connected to an approved protection and or alarm circuitry in the panel for
winding thermal protection.
Thermal protection shall not be used as a motor overload
device. A separate motor overload device must be provided in accordance with NEC
codes.
In the event of an overload, the source of this condition should be determined
and rectified immediately. DO NOT LET THE PUMP CONTINUE TO RUN IF AN OVERLOAD
CONDITION OCCURS. Full load amps are 15 amps for 230 Volt single phase; 17amps for
208 Volt single phase; 11.0, 9.0, & 4.5 amps for 208V, 230V, & 460V three phase models.
OPTIONAL MOISTURE SENSOR
A detector is installed in the pump seal chamber which
will detect any moisture present. It is recommended that this detector (Black & White
wires) be connected in series to an alarm device or the motor starter coil to alert the
operator that a moisture detect has occurred. In the event of a moisture detect, check
the individual moisture sensor probe leads for continuity and the junction box/control box
for moisture content. This situation may induce a false signal in the moisture detecting
circuit. Normal resistance between leads is 33,000 OHMS indicating normal connection.
When the resistance drops well below 33,000 OHMS, then moisture is present and the
pump seals should be serviced. If none of the above tests prove conclusive, the pump(s)
should be pulled and the source of the failure identified and repaired.
IF A MOISTURE
DETECT HAS OCCURRED, SCHEDULE MAINTENANCE AS SOON AS POSSIBLE.
SERVICE
Lubrication:
Anytime the pump is removed from operation, the cooling oil in the motor
housing should be checked visually for oil level and contamination.
Checking Oil:
To check oil in the motor housing, set pump upright. Remove plug from
motor housing. With a flashlight, visually inspect the oil in the motor housing to make sure
it is clean and clear, light amber in color and free from suspended particles. Milky white
oil indicates the presence of water. Oil level should be just above the motor when pump is
in the vertical position.
Testing Oil:
Place pump on it’s side, remove plug from motor housing and drain oil into
a clean, dry container. Check oil for contamination using an oil tester with a range to 30
Kilovolts breakdown. If oil is found to be clean and uncontaminated (measuring above
15KV. Breakdown), refill the motor housing. (See Replacing Oil below) If oil is found to be
dirty or contaminated, the pump must be carefully inspected for leaks at the shaft seals,
cord assemblies, O-rings, and plugs before refilling with oil. To locate the leak, perform
a pressure test. After leak is repaired, dispose of old oil properly, and refill with new oil.
Replacing Motor Housing Oil:
Drain all oil from motor housing and dispose of properly
per local and environmental standards. Set unit upright and refill with new cooling oil. Fill
to just above motor (approximately 66oz) as an air space must remain in the top of the
motor housing to compensate for oil expansion. Apply pipe thread compound to threads on
plug and insert and tighten into housing.
Replacing Seal Chamber Oil:
Drain all oil from seal chamber and dispose of properly per
local and environmental standards. Set unit on its side, with plug upward, and refill with
new oil. (approximately 13oz) Apply pipe thread compound to threads on plug and insert
and tighten into housing.
WARNING!
Do not overfill oil. Over filling of oil can create excessive and dangerous hydraulic
pressure which can destroy the pump and create a hazard. Overfilling oil voids warranty.
DIELECTRIC COOLING OIL:
BP – Enerpar SE100: Conoco – Pale Paraffin 22; Mobile –
D.T.E. Oil Light; G&G Oil – Circulating 22; Imperial Oil – Voltesso-35; Shell Canada –
Transformer-10; Texaco – Diala-oil-AX; Woxo – Premium 100.
Pressure Test for pumps that have not been disassembled:
If the pump has been
disassembled, the oil should be drained before a pressure test. Remove plug from motor
housing. Apply pipe sealant to a pressure gauge assembly and tighten into hole. Pressurize
motor housing to 10 P.S.I. Use soap solution around the sealed areas and inspect joints for
“air bubbles”. If, after five minutes, the pressure is holding constant, and no signs of leaks
are observed, slowly bleed the pressure and remove the gauge assembly. Replace oil. If the
pressure does not hole, then the leak must be located and repaired.
CAUTION!
Pressure builds up extremely fast. Too much pressure will damage seal.
Pressure Test for pumps that have not been disassembled:
The pressure test may be
done with the oil at its normal level. Remove plug from motor housing. Apply pipe sealant
to a pressure gauge assembly and tighten into hole. Pressurize motor housing to 10 P.S.I.
Use soap solution around the sealed areas above the oil level and inspect joints for “air
bubbles”. For sealed areas below the oil level, leaks will seep oil. If, after five minutes, the
pressure is holding constant, and no signs of leaks are observed, slowly bleed the pressure
and remove the gauge assembly. Replace oil. If the pressure does not hole, then the leak
must be located and repaired.
Seal Chamber Pressure Test:
Set unit on its side with fill plug downward, remove plug
and drain all oil from seal chamber. Apply pipe sealant to pressure gauge assembly and
tighten into hole in seal plate.
Pressurize seal chamber to 10 P.S.I. and check for leaks as outlined above.
User Guide
