APEC RO-PH90 Service manual

ULTIMATE REVERSE OSMOSIS SYSTEM
INSTALLATION INSTRUCTION
& OWNER’S MANUAL
All Rights Reserved © APEC Water Systems
Ver 3.2

Please keep this Owner’s Manual for future reference.
It contains useful information on how to maintain and care for your
APEC Reverse Osmosis water filter system.
TABLE OF CONTENT
1. Installation:
Preparation ................................................................... page 1
Filter housings assembly ................................................. page 5
Feed water connection .................................................... page 6
Drain saddle connection ................................................ page 10
Faucet mounting ............................................................ page 12
Connecting the whole system ......................................... page 13
2. Maintenance:
Filter change schedule & instructions ............................. page 18
3. Owner’s Manual - RO Basics:
System flow diagram ...................................................... page 23
Input water pressure: most important factor ................... page 24
TDS meter: testing your water quality ............................. page 24
Tank volume & delivery pressure ..................................... page 25
Misc. topics .................................................................... page 26
4. Trouble-shoot Guide:
RO Head diagram .......................................................... page 28
Humming noise ............................................................... page 29
No water at dispensing faucet ......................................... page 29
System slow shut-off ....................................................... page 31
TDS level higher than normal ......................................... page 33
Filter housing is leaking .................................................. page 34
Tank ball valve is leaking ................................................ page 35
Pure water still taste like Tap water ................................. page 35
Air bubble in cup or bottle when filling ........................... page 35
5. Other Information:
AirGap Faucet Installation ............................................. page 36
6. Warranty ........................................................................... page 38

1
Thank you for choosing APEC reverse osmosis systems.
You now own the finest water filter in America.
Please read and become familiar with instructions and parts needed before proceeding with the
installation.
(This manual is constructed for standard APEC Ultimate RO System. For RO-PH90, RO-PERM and
RO-PUMP system installation, please refer to the included addendum.)
BEFORE INSTALLATION:
Inspect the system:
Please take the system and all the components out of the box. Inspect the system and all the
connection fittings carefully, make sure nothing is damaged during shipping. If any part is cracked
or broken, please do not proceed with the installation and contact APEC or your distributor for an
exchange or diagnosis.
Recommended tools list:
•Variable speed drill
•Drill bit: 1/4” (for the waste line), 1/8” (as pilot, not mandatory), and 1/2” (for standard
faucet hole, air-gap faucet requires 1&1/4” hole)
•5/8”, 9/16” open-end wrench, or adjustable wrench, pliers
•Phillips screwdriver
•Utility knife, or scissors
•Teflon tape
Operating Parameter
•Operating pressure: 85psi maximum
•Feed water temperature: 40 – 100 degree F (4-37 degree C)
•Do not connect this unit to hot water source
•Install the RO in a sheltered environment, avoid exposure to hot and cold weather or under
direct sun light.
Copyright:
This manual is copyrighted by APEC Inc. Under the copyright laws, this manual may not be reproduced in any form, in
whole or part, without the prior written consent of APEC Inc. Manual print ver. 3.2, 2015 Jul.
General Installation/Operation/Maintenance Requirements
•Installation needs to comply with state and local laws and regulations.
•System must be installed indoor away from possible environmental damage
•Do not use with water that is microbiologically unsafe or of unknown quality without
adequate disinfection before or after system. Systems certified for cyst reduction may be
used on disinfected water that may contain filterable cysts.
•This reverse osmosis system contains a replaceable treatment component critical for
effective reduction of total dissolved solids. The product water shall be tested periodically to
verify that system is performing satisfactorily.

2
Components included with the RO system:
Make sure you have all these parts before starting installation.
1 RO system head
with pre installed membrane
3 Pre-filters in 3 Housings 1 Storage tank
Installation kit includes:
1 Faucet with
washers and nuts
1 Feed water adaptor
3/8”- 1/2”
with needle valve kit
1 Drain saddle for waste water
3 Color tubing 1/4” 1 Tank’s Ball Valve 2 Wrenches
for opening filter and
Membrane housing
1 Faucet Adapter

3
Component Itemization:
1) Sediment pre-filter and housing (1st-stage filter)
2) Carbon block pre-filter and housing ( 2nd-stage filter)
3) Carbon block pre-filter and housing ( 3rd-stage filter)
4) Membrane and housing (4th-stage filter)
5) In-line carbon filter (5th-stage filter)
6) Storage tank
7) Tank ball valve
8) ASO – Automatic Shut Off valve
9) Check valve (Internal check valve encased in plastic fitting)
10) T-fitting
11) Feed water inlet
12) Product (filtered) water outlet
13) Bracket

4
2. Metal compression nut fitting: (comes with 1 insert, 1 sleeve, 1 nut) Only feed water
adapter-needle valve is this type.
Fitting Types: There are 2 types of fittings provided for connecting the system
Important! Use plastic sleeve and inserts on the plastic tubing we
provide. Do Not use metal sleeve or insert on plastic tubing or the
connection will leak!
Fig.1B
How to connect: - See Fig.1B. Slide the compression nut onto the tubing.
- Slide the plastic sleeve onto the tubing.
- Insert the “insert” into the tubing.
- Insert the tubing into the opening of the fitting.
- Slide the brass nut up, then tighten nut with a wrench. No Teflon tape!
(An extra metal sleeve is provided in case you need to connect your own metal
tubing. Use Teflon tape if connecting metal tubing.)
1. Quick-Connect (QC) fitting: (no insert, sleeve, or nut)Most of the fittings on the RO unit are this
type.
How to Connect: - See Fig.1. Push the tubing into the Quick-Connect fitting, then gently
pull back on the tubing to make sure connection was secure.
- No inserts, sleeve, or nuts are needed to secure the connection.
- No Teflon tape!
To Disconnect: - See Fig.1A. Push in and hold down on the collet ring square against
the fitting. With the collet held in this position the tube can be removed.
Fig. 1 Fig. 1A

5
THERE ARE TWO PARTS TO INSTALLING THE RO SYSTEM:
Part I. Assemble the filters and housings onto the main system
Part II. Installing the system
Note: The RO Membrane Element has already been pre installed.
PART I. ASSEMBLE THE FILTERS AND HOUSINGS ONTO THE MAIN SYSTEM
Remove plastic/paper wrappings on the 3 filters, put them into the 3 housings, and assemble the
housings onto the main system as follow:
1. See Fig. 2 Stand the 3 housings upright. Make sure each housing has a rubber O-ring in its
groove.
Put the APEC Sediment filter (1-SED10) into the “1st stage” housing on the right.
Put the APEC Carbon filter (23-CAB10) into the “2nd stage” housing in the middle.
Put the APEC Carbon filter (23-CAB10) into the “3rd stage” housing on the left.
2. See Fig. 3 Starting from the 3rd stage housing on the left, hand twist the housing onto the main
system turning counterclockwise, one by one, for all 3 housings.
3. See Fig. 4 Use the wrench provided to completely tighten the housing starting from 1st-stage.
Repeat this step for the 2nd stage housing in the middle, and for the 3rd stage housing
on right.
Note: For some people it is easier to use the wrench with the system laid down
(face up).
4. See Pg. 3 Remove 3 end plugs (white color) from Point 10,11,12
Fig. 2 Fig. 3 Fig. 4
turn counter-clock
wise
to tighten
3rd
Stage
3rd
Stage
2nd
Stage
1st
Stage
Use
Wr
ench
W
Use

6
PART II. INSTALLING THE SYSTEM
Space: Make sure there is sufficient space under the counter for installation (an area of about
17”L x 6”W x 18”H for the system, 11”D x 18”H for tank).
The RO system is best installed under the kitchen sink. But if that is not feasible you
can install the system anywhere where there is a cold water supply with sufficient
water pressure for the chosen RO model, and an outlet to drain off the waste water
from the system.
Mounting: No need to mount the RO system on the wall. The RO system can stand in the sink
cabinet without mounting, this makes future filter change easy and convenient. If
you prefer to mount the system to the wall, please make sure it can be taken down
easily for filter replacement.
Feed Water: RO systems are designed to treat both hard and soft water and can handle incoming
TDS levels up to 2000ppm.
Step 1: Feed Water Connection
The RO system must be connected to the COLD water supply only!
1. Locate the Cold water supply valve under the kitchen sink (the round or oblong handle on
the right side). Turn off the incoming cold water completely by turning the shut off handle
clockwise.
Note: If the cold water shut off valve can not turn off the water, the main water supply
to the house must be shut off for the installation. Another option is to use a “self
piercing saddle valve” from APEC or from a local hardware store.
2. Feed Water Adaptor (1/2” to 3/8”): See Fig. 5. The Feed Water Adaptor comes with a
separate Needle Valve. The Adaptor goes inline onto your 1/2” or 3/8” cold water pipe. The
Needle Valve portion screws onto the Adaptor as shown in Fig. 5A.
Fig. 5
A. 1/2” x 3/8” Male-Female Water Supply Adapter
with O-ring.
B. 1/2” x 3/8” Male-Female Converter with O-ring.
C. 1/4” x 1/8” Male Needle Valve.

7
Fig. 5A - Needle Valve Installation.
Attach the needle valve (C) to water supply adapter (A). Please apply 5-6 wraps of
teflon tape to needle valve prior to connecting it to the water supply adapter (A).
Fig. 5B - If your pipe has a 1/2” Connection.
By attaching the 1/2” x 3/8” converter (B) to the Male end of the water supply adapter
(A), you now have a 1/2” Male and Female water supply adapter.
Fig. 5C - If your pipe has a 3/8” Connection.
By attaching the 1/2” x 3/8” converter (B) to the Female end of the water supply
adapter (A), you now have a 3/8” Male and Female water supply adapter.
Fig. 5A
Fig. 5B Fig. 5C
1/2” Connection 3/8” Connection

8
Riser
Tube
For Flexible Line
Faucet
Shank
Main Water
Supply
Shut-off
Valve
Riser
Tube
For Solid Line
Faucet
Shank
Feed Water
Adaptor
Feed Water
Adaptor
Main Water
Supply
Shut-off
Valve
Sink Sink
3. Recommend Connection For Flex Line Riser: See Fig.6A. & Fig. 6D. Loosen nut and
separate cold water riser tube from faucet shank. Gently bend riser tube so that the Feed
Water Adapter (Fig 5) fits onto the faucet shank. If your riser tube has no built-in washer, then
fit the cone-shaped washer provided onto the riser tube. Connect the riser tube, the feed water
adapter, and faucet shank together and tighten.
For Solid Copper Riser: See Fig.6B. Follow the same procedure as for flex line. If the copper
riser cannot bend, then it’s best to replace it with a flex line riser. Then fit the feed water adaptor
the same way as described above.
Fig. 6A Fig. 6B
Option Connection Point: See Fig. 6E. The feed water adapter can also be installed between the
riser tube and faucet shank. Loosen nut and separate cold water riser tube from faucet shank.
Gently bend riser tube so that the Feed Water Adapter fits onto the faucet shank. Connect the
riser tube, feed water adapter, and faucet shank together and tighten.

9
Fig. 6C
4. Needle Valve: See Fig. 6C. Screw the Needle Valve onto the Adaptor tightly. Apply 6-8 rounds
of Teflon tape onto Needle Valve before attaching it to the Adaptor.
To open needle valve: Turn needle handle counter-clockwise.
To close needle valve: Turn needle handle clockwise.
Test for leaks at this point: Close the Needle Valve (turn needle handle clockwise all the
way in to close) Turn ON the cold water supply to the sink faucet. If the Needle Valve or the
Adaptor leaks, check the connection and try applying more Teflon tape or tighten the brass
nut some more to stop the leak.
Fig. 6D Fig. 6E

10
MOUNT DRAIN
SADDLE AT
EITHER
LOCATION
Step 2: Drain Saddle Installation
Note: To avoid annoying drainage noise, mount drain line as low as possible
on the vertical tailpiece, or on horizontal tailpiece.
There is constant water pressure “packed” inside the RO system which blocks the waste water
from backing-up into the system. So the waste water is “forced-drained”, not “gravity-drained”.
1. See Fig.7. The drain saddle assembly should be installed above the trap and on the vertical
or horizontal tailpiece . To reduce the drainage noise, mount the drain line as low as possible
above the trap, or on the horizontal tailpiece.
2. See Fig.8. Mark the position of the hole on the drain pipe and drill a 1/4’’ hole through one
side of the drain pipe . There is a piece of self-adhesive sponge provided. Glue this sponge
to the inside of the saddle, this will cushion any gap between the saddle and the pipe. Make
sure the hole on the sponge is thoroughly punched out, and is aligned to the hole on the
saddle.
Fig. 7
Fig. 8 Fig. 9

11
Step 3: Drill A Hole For The RO Faucet
Drill 1/2” diameter hole for standard RO faucet. (Air-Gap faucet: drill 1&1/4” hole.)
For best results use a 1/2” carbide-tipped masonry drill bit.
Wear safety glasses to protect your eyes while drilling the faucet hole.
Note: No need to drill a hole if an existing hole is available:
a) Spare hole: If there is a spare hole in the sink covered by a chrome cover, simply remove the
chrome cover and install the RO faucet there.
b) Spray hose: If the spray hose is not in use, remove the hose, and mount the RO faucet there.
Remember to plug up the outlet under the main faucet. If the spray hose uses a diverter at the base of
the spout, be sure to remove it to avoid trouble later on.
c) Hanging faucet: If drilling a hole is not feasible (i.e. rental home, drill tool not available etc.),
the faucet can just on the cabinet door or wherever that is convenient. Be creative!
When drilling a hole for the RO faucet, choose a location that looks good, works well, and is
most convenient for dispensing pure water. An ample flat area is required for the faucet base so
that the faucet can be drawn down tightly.
1. Faucet location: Make sure the faucet stud will be accessible from below when the hole
is drilled. If space is not available on the upper sink area, the faucet can be located on the
counter top by the edge of the sink. If the counter top is ceramic tile, the method for drilling
the hole will be the same as for porcelain sinks.
2. For Stainless Steel Sink: Before using a 1/2” carbide drill bit, an indent should be made
with a center punch to keep the drill bit from walking. A small pilot hole will also aid the drill
bit.
3. See Fig.9, 9A. Make sure to align the drain saddle hole to the drilled hole perfectly.
Mis-aligning these two holes will block the waste water and cause membrane damage.
Attach the drain saddle to the drain pipe and tighten the two screws evenly.
Fig. 9A

12
Black Locating Washer
Lock Washer Lock Nut
Faucet Adapter
Tubing
Counter Top
Counter Top
Opening
Chrome Base
Step 4: Mounting The Faucet
1. Mount the faucet as shown in Fig.10.
Fig. 10
2. Attach threaded end of faucet adapter to the
faucet metal stem. No teflon tape needed here.
3. Connect the Clear line to the faucet.
3. The faucet has a solid metal handle
that controls the flow of purified water
exiting the faucet. Turn the handle to
horizontal position to release the water
and vertically to shut off.
3. For Porcelain Sink: Porcelain enameled sinks can readily be chipped if care is not exercised
when drilling the hole. Before starting the drill motor, apply firm downward pressure on the bit
until a crunching occurs. This will help keep the drill bit from walking when starting the hole.
A small pilot hole will also aid the drill bit.
Note: Immediately after the hole drilling is done, clean up all metal chips, as metal chips
will stain the porcelain!!
Step 5: Positioning The System
1. Main System: The main system can stand in the sink cabinet. No need
to mount the system to the wall. If you prefer to mount the system to the
wall, please make sure it can be taken down easily for filter replacement.
2. Tank: The storage tank can also lay on its side if needed. The tank works fine in this
position. If the tank cannot fit under the kitchen sink, it can be placed elsewhere up to 20 feet
away from the RO system without much pressure loss.

13
Step 6: Connecting The System
Summary of Tubing Connections:
There are 4 connections: See Fig 11 and 11A
Point Ato X: Connect RO to COLD water supply — Red tubing.
Point Gto Y: Connect product water from 5th-stage filter to tank — Yellow tubing. This tubing
is a 2-way line, Product water enters and leaves the tank via this line.
Point Hto Z: Connect product water from 5th-stage output to RO faucet — Clear tubing.
Drain line to W: Connect waste water from 4th-stage membrane to drain outlet — Black tubing.
Please Note: The diagram below is for our Non Pump RO-45, RO-90 and RO-PH90. If
you are installing the RO Perm or RO Pump, please refer to the diagram in the
addendum.
Fig. 11

14
Fig. 11A
Details on Tubing Connections:
To ensure a smooth and correct installation, please connect the water lines following the se-
quence and order outlined below. Refer to Fig.11 & 11A for proper point locations.
1. Point Z Faucet connection:
Tubing color: Clear tubing. Connect the CLEAR tubing to the base of the RO faucet.
Fitting type: Quick Connect Fitting. Simply push Clear tubing into Quick Connect fitting. No Insert,
Sleeve or Nut needed here. (Attach threaded end of faucet adapter to the faucet metal
stem. No teflon tape needed here)
2. Point X Feed water connection:
Tubing color: Red tubing. Connect the RED tubing to the Feed Water Needle Valve.
Fitting type: Metal compression nut fitting. See Fig.1B on page 4. Use plastic sleeve.
Add “insert” to tubing. No teflon tape here. Tighten nut with wrench.
Tips! If Point X leaks after you have tightened the brass nut, check to make sure you did put the
plastic “insert and sleeve” onto the tubing. If the insert is already in place, then try
applying Teflon tape from the threaded metal stud all the way to the plastic tubing, wrap
the whole connection with 8-10 rounds of Teflon tape. Smooth out the tape on the
threaded part with your fingers. Tighten brass nut again. This should stop the leak.
If the plastic sleeve is damaged, you can use the metal sleeve, but you need to apply
Teflon tape as described above, this should stop the leak.

15
3. Point W Waste water connection:
Tubing color: Black tubing. Connect the BLACK tubing from the RO to the Drain Saddle.
Fitting type: Quick-Connect fitting on drain saddle. No teflon tape.
Do Not add ”insert” into Black tubing. Simply push tubing into port.
4. Point A System water inlet (to Stage 1 prefilter) connection:
Tubing color: Red tubing. Connect the RED tubing from the Feed Water Valve to the RO’s stage -1
prefilter.
Fitting type: Quick Connect fitting See Fig.1 on page 4. Simply push the Red tubing into the Quick
Connect fitting. No Inserts, Sleeves or Nuts are needed to secure the connection. No
teflon tape needed here.
5. Point H Stage-5 filtered water to faucet connection:
Tubing color: Clear tubing. Connect the CLEAR tubing from the faucet base stud to the Stage-5 filter’s
outflow end at point H. (See “Flow -->” arrow on the filter for flow direction.)
Fitting type: Quick Connect fitting See Fig.1 on page 4. Simply push the Clear tubing into outlet
on the 5th stage filter. No Inserts, Sleeves or Nuts are needed to secure the
connection. No Teflon tape needed here.
Please Note: There are two end plugs on the stage 5 filter that has to be removed before
inserting the tubing. Please refer to Fig. 1A on page 4 for removal instruction.
6. Point G Stage-5 filter’s T-fitting connection:
Tubing color: Yellow tubing. Connect the YELLOW tubing to Stage-5 filter’s T-fitting.
Fitting type: Quick Connect fitting See Fig.1. Simply push the Yellow tubing into the 5th stage filter’s
T Fitting. No Inserts, Sleeves or Nuts are needed to secure the connection. No Teflon tape
needed here.
(Note: If the unit comes with a UV Light, connect the Yellow tubing to the T- fitting on the
UV, as the Stage 5 filter will not have a T-fitting).

16
Ball Valve
(Recommended)
Tee tting for
icemaker
7. Point Y Tank’s input & output connection:
Prepare tank: See Fig.12. Apply 6-8 wraps of Teflon tape to tank’s threaded Output stem on top of
tank (remove rubber cap if there is one). Screw tank Valve onto Output stem.
Tubing color: Yellow tubing. Connect the YELLOW tubing from Stage-5 T-fitting to the tank’s valve.
Fitting type: Quick-Connect fitting on ball valve. Simply push Yellow tubing into valve port.
Air pressure: The 4 gallon tank comes pre charged at 5 psi, 14 gallon tank at 7 psi.
Fig. 12
OFF Position ON Position
Tank Ball Valve
Option: Ice-maker Connection
If you want to connect product water from the RO to your ice-maker, you will need:
•One T-fitting, preferably the quick-connect type fitting
•Extra ¼ “ tubing long enough to go from the RO system to your ice-maker
•Optional: One shut-off valve, preferably the quick-connect type.
See Fig.13. Before connecting the product water line from Point Z to H, add a T-fitting near
point H to divert product water to both the ice-maker and the faucet. It is best open the line to
the ice maker after the first tank has been discarded and the 2nd tank has completely filled.
Standard 4-gallon Tank Diagram:
Refrigerator
Fig. 13

17
Using RO for Ice-maker only:
If you want the RO to feed your ice-maker (fridge) only, you should still connect the RO faucet
as a 2nd outlet. This allows you to drain the tank, flush new filters through the faucet rather than
through your icemaker line. You can hang the faucet by the system and not mount it.
Option: Multiple Outputs - Add Shut Off Valve:
If your RO is feeding several output points (icemaker, fridge, bathroom), you should add a
Shut-Off valve to each output line (except the RO spigot line). This way, if you ever need to
diagnose a problem in the system, you can easily shut off these lines to isolate the water flow for
accurate troubleshooting.
Step 7: System Start-Up
1. Turn on feed water: Slowly, turn on your Cold water supply. Turn on the Needle Valve (turn
counter-clockwise) to allow the raw water to enter the system. Check for leaks!
2. Turn on tank valve: Turn on the tank’s ball valve to allow water to enter the tank. The
tank’s valve is “On” when the valve handle is parallel (in the same direction) with the valve’s
outlet (see Fig.12). Check for leaks!
3. Wait for tank to fill: Before usage, allow the tank to fill. Tank normally takes 2-3 hours to
fill. When the tank is filled, the RO will shut off automatically.
4. Drain Tank: Do not use the first tank of water! Drain it out to flush the system
and new filters.Lift the faucet lever up into a locked position to drain
tank. Let the tank refill again and the pure water is ready for use.
5. Clean up area: Allow the system to run while cleaning up tools and work area.
6. Check for leaks! Make sure no leaking at joints, fittings, valves, and tubing connections.
Congratulations! You have successfully installed the Reverse Osmosis System!
Note: If your RO makes an annoying noise. See Troubleshoot Guide section for explanation and
instructions on page 29.
* * * End Installation Section * * *