Introduction
The AQL-CHEM2 is a 120VAC CO
2
dispense kit designed for use with a Goldline Aqua
Rite Pro chlorinator or Pro Logic pool control. The AQL-CHEM2-240 is identical to
the AQL-CHEM2, but uses 240VAC. When used with the AQL-CHEM sensing kit, the
AQL-CHEM2(-240) solves the problem of how to provide low cost pH control for
backyard pools without having to handle acid. The AQL-CHEM2(-240) is designed to
install on a standard CO
2
tank and wire directly to the Aqua Rite Pro or Pro Logic.
Using the AQL-CHEM sensing kit, the Aqua Rite Pro or Pro Logic will sense the pH
level and if needed, the AQL-CHEM2(-240) will inject CO
2
into the pool water. CO
2
is
mildly acidic when dissolved in water and will lower the pool's pH slowly without the
safety or health concerns normally associated with harsher acids.
What's Included
The AQL-CHEM2 and AQL-CHEM2-240 includes the following:
-Pressure reducing regulator preset at 50 psi output
-110 VAC (AQL-CHEM2) or 240VAC (AQL-CHEM2-240) solenoid valve with 6' power
cord
-Nylon washer and spare (only use one)
-15' of black UV resistant flexible tubing
-PVC check valve injector
CO
2
information and availability
The AQL-CHEM2(-240) kit requires the use of CO
2
which is supplied in cylinders that
are readily available from various sources. CO
2
cylinders are offered in a variety of
sizes. Goldline recommends the use of 20 pound cylinders for most residential pool
applications. The AQL-CHEM2(-240) uses a standard fitting for these tanks. CO
2
can
be easily found at local and national welding supply or beverage companies. A quick
search on the web with the keywords “CO
2
supply” will yield many companies, some
with hundreds of branch/store locations nationwide.
Installation
Installation
Installing the AQL-CHEM2 or AQL-CHEM2-240 requires the following steps:
-Mount CO
2
tank using commercially available straps
-Attach the solenoid valve to the CO
2
tank
-Install the PVC check valve injector to the pool's return plumbing
-Plug the solenoid valve into the pigtail of the Aqua Rite Pro or Pro Logic pool control
-Configure the Aqua Rite Pro or Pro Logic to control the AQL-CHEM2(-240)
This manual assumes that the Goldline AQL-CHEM Chemistry Kit and the pH Dis-
pense Pigtail (included with AQL-CHEM) have already been installed. If not, this will
need to be performed prior to installation. Refer to the AQL-CHEM manual for instal-
lation instructions.
Mount CO
2
tank
Mount the CO
2
tank in an easily accessible location. Straps or brackets can be pur-
chased from the tank supplier and must be used for a secure installation.
Attaching the solenoid valve
The solenoid valve attaches to the CO
2
tank much like an outdoor gas grill attaches to
a propane tank. With the tank valve off, insert the included nylon washer and screw
the fitting of the AQL-CHEM2(-240) solenoid valve on to the CO
2
tank. If the nylon
washer is lost or destroyed, a spare is provided. Keep the tank's valve off until the
entire installation is complete.
Installing the PVC check valve
When installing the PVC check valve, refer to the plumbing overview of the AQL-
CHEM and AQL-CHEM2(-240) shown below. The PVC check valve must be installed
at the pool's return line DOWNSTREAM of the electrolytic cell and flow switch.
Because mild acid will be dispensed at this location, it should be the last component
installed in the return line before water is allowed to flow back to the pool. Note that
the injection point must be free of air pockets and should be located at the underside
(or close to the underside) of the pipe.
To install the check valve, perform the following steps:
1.
Turn off pool filter pump.
2.
Drain water from the return line.
3.
Drill a 7/16" hole in the bottom side of the return line AFTER the electrolytic
cell and flow switch.
4.
Tap the hole for a 1/4" NPT. Use caution not to tap tapered threads too deeply.
5.
Apply plumber's tape to check valve threads and screw into tapped hole. DO
NOT OVERTIGHTEN.
7.
Connect one end of the provided 3/8" flexible hose to the check valve and the
FROM POOL
FROM SPA
RETURN
TO POOL
RETURN
TO SPA
POOL
pH dispense kit
Insert nylon washer
before attaching to tank
PVC check valve
mounted to
underside of pipe
