Shurflo 4048-153-E75 Installation Manual
Minimum Wire Size for a 10% voltage drop on a
12VDC, 15
Feet [Meters]
0 to 20
[0 to 6]
14
[2.5] 20 to 50
[6 to 15]
12
[4] 50 to 70
[15 to 21]
10
[6] 70 to 100
21 to 30]
8
[8]
Typical Pump Installation
4048 RV By-Pass Pump By SHURflo
Installation & Maintenance Manual
Installation Preparation
The goal of installation is to provide a quiet,
easy-to-maintain installation with good flow
and low backpressure. This can be
accomplished with the following guidelines:
Ø Mount on a solid surface in an
accessible location for strainer
cleaning and pump maintenance.
Ø Use flexible high-pressure hose on
the pump inlet and outlet [such as
SHURflo Kit 94-591-01]. The pumps
ports and strainer should not be
connected to plastic or rigid pipe, or
the pump's normal motion will
transmit through rigid plumbing
causing noise, and possibly
loosening or cracking components.
Ø Pump must use an adequate 50-mesh
strainer [such as SHURflo 255 series
strainers].
Ø Use a minimum of 1/2" [13mm] Inner
Diameter plumbing. Smaller ID
plumbing will cause cavitation, high backpressure, low flow and noise.
Ø No need for an accumulator with by-pass pumps.
Ø Pump is designed for intermittent duty only: Do not use these pumps for running a Reverse-Osmosis
[RO] Filtration System. High pressure-continuous duty usage will shorten the life of the pump and is not
covered under warranty.
Ø Wire Size is 14 GA [2.5mm²] MINIMUM, 12GA [4mm²] is recommended---See Wire Chart in Electrical
Section for minimum sizing.
Ø Minimum power requirement is a 15 Amp circuit.
Ø Reduce restrictions on inlet and outlet. This includes small inner diameter shut-off valves,
winterizing valves and elbows.
Ø If the RV has an Intellitec Pump Controller, it must be rated at 15 amps; If the controller is rated at
7.5 or 10 Amps, a new controller or a high-amp relay must be used.
Mounting
Ø Mount the pump within 6 feet of the tank for best performance and pump life. The pump will pull farther,
but the farther it pulls the more work it does, increasing vibration and noise, and reducing the output
and pump life.
Ø Mount pump in a space of at least 1 cubic foot for adequate ventilation to prevent overheating.
Ø Pump may be mounted in any position.
Ø Mount pump for easy access for cleaning strainer, maintenance and service.
Ø Mount pump on a solid surface to prevent vibration and noise.
Electrical
Ø The pump works best on an individual filtered circuit,
protected by the recommended fuse or breaker specified on
the label.
Ø A 15-Amp switch is recommended and should be on the
positive lead.
Installation Guidelines
- Solid surface within 6 feet of tank - Accessible location
- Minimize flow restrictions in the system - Strainer on pump inlet
- No accumulator needed - Properly sized wiring
- Flexible hose on inlet and outlet - Proper electrical protection
- Minimize plumbing elbows and valves - Properly sized plumbing
Amp Circuit. Length is the distance from the power
source to pump and back to ground.
AWG [mm²]
911-1024 Rev-A _ English August-2011 Page -1
Ø Wire Sizing: Proper wire sizing is required for good pump operation. If the wire is too small, low voltage
will affect the pump performance and can create a fire hazard. SHUT OFF POWER TO THE PUMP
WHEN LEAVING THE RV UNATTENDED.
Plumbing
Installation of a strainer is required to prevent debris from entering the pump. For noise and vibration
reduction we recommend at least 18 in. [.5 M] of 1/2" [13mm] I.D. flexible high-pressure hose to both ports.
The pump ports and strainer should not be connected to plastic or rigid pipe. This hose should be anchored
where it meets the hard plumbing to reduce plumbing vibration.
Operation
This pump is designed for intermittent duty only. The pump operates normally up to about 30-psi, where a
spring-loaded by-pass valve opens, allowing flow back from the output side to the input side, providing
smooth, steady flow with virtually no cycling, all the way down to a trickle. As a faucet is opened back up, the
pressure will drop, the by-pass will close and full flow is again obtained. This allows good flow, even with
today’s restrictive showers and pullout sprayer faucets. Performance will vary, of course, depending on the
voltage to the pump; lower voltage = lower flow, higher voltage = higher flow. Remember your electrical
safety: It is always best to shut power to the pump OFF when leaving the RV unattended.
About the By-Pass NOTE: By-pass adjustment should only be performed by a professional technician
with proper gauges and equipment. The by-pass is a spring loaded diaphragm that opens up allowing
water from the discharge side back to the inlet side. The by-pass is set to begin opening at about 30 psi and
creating full by -pass at about 65 psi. The pressure switch on the pump is set to shut off at 55 psi. If the switch
or by-pass are adjusted too much, the by-pass and switch shut-off can overlap and THE PUMP WILL NOT
SHUT OFF. Screwing the switch screw in clockwise will raise the shut-off pressure. Unscrewing the switch
screw counterclock wise will lower the pump shut-off pressure. Screwing the by-pass screw in will raise the
pressure at which the by-pass starts and raise the full by-pass pressure. Unscrewing the by-pass screw
counterclockwise will lower the pressure at which by-pass starts and lower the full by-pass pressure.
WARNING: If full by-pass is reached before the shut-off setting, the pump will not shut off. Full bypass pressure setting should be at least 10 psi higher than pump shut off pressure.
Maintenance
Normal pump maintenance is all that is needed: Checking and cleaning of the strainer, normal sanitizing and
winterizing and occasionally checking all plumbing hardware and fittings for tightness. Lack of sanitizing is
the number one reason for premature pump failure and poor performance over time. Lack of sanitizing will
cause scale build-up on the diaphragm and valves, causing low flow and leak back [occasional pump cycling
with no faucets open or tank filling up when hooked up to city water].
Sanitizing
Potable water systems require periodic maintenance to keep components working properly and deliver a
consistent flow of fresh water. Sanitizing is recommended: prior to storing, after a period of storage, or any
time the system is opened or contaminated, as follows: NOTE: Check your Vehicle Owner’s Manual for
specific instructions . By-pass any filters or remove filter cartridges.
1. Determine the amount of common household bleach needed to sanitize the tank.
A) 2 ounces of bleach per 15 gallons tank size: 60 gallon tank [15 x 4] = 4 x 2 ounces = 8 ounces of bleach.
B) I ml bleach per 1 liter tank size: 300 liter tank = 300 milliliters of bleach.
2. Mix the bleach with water in a container such as a gallon jug. If tank is filled through a pressurized fitting,
pour the bleach into the hose before attaching the hose to the city water entry.
3. Pour the bleach solution into the tank and fill the tank with potable water. Rock the RV back and forth to coat
top and sides of potable water tank.
4. Open all faucets (Hot & Cold) allowing the water to run until the odor of chlorine is detected. Allow four
(4) hours of contact time to disinfect completely. Doubling the solution concentration allows for a
contact time of one (1) hour.
911-1024 Rev-A _ English August-2011 Page -2
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