A. O. Smith CNS-10 Installation Manual

Instruction Manual

INSTALLATION, OPERATION & MAINTENANCE

CONDENSATE NEUTRALIZING SOLUTION

INSTALLATION - OPERATION - MAINTENANCE

500 Tennessee Waltz Parkway
Ashland City, TN 37015

PRINTED 0311 320898-000

Phone: [phone]

Fax: [phone]

Email: [e-mail]

Condensate Neutralizing Solution – Installation, Operation & Maintenance

Overview

Condensate Neutralizing Solution (CNS) increase pH
(reduce acidity).

CNS residential and commercial ue-side neutralizing tubes are
designed to raise the pH level of the condensate discharged by
high-efciency boilers and water heaters.

Each change of 1.0 in pH is a 10-times reduction (or increase)
in concentration. The pH of condensate is increased by
approximately 1.0 to 3.0 after passing through CNS tubes. (This
is a change in concentration of from 10 to 30 times.)

Figure 1 CNS Tubes – features and dimensions

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What is pH?

The pH measurement of a uid is an indicator of the acidity
or alkalinity. Neutral uids have pH of 7.0. Acid uids have pH
below 7.0. And alkaline uids have pH above 7.0 (up to 14.0).
The pH can be easily measured using litmus paper contained in
a pool PH test kit.

Condensate from condensing boilers and water heaters is
typically around 4.0 (slightly acidic). The condensate needs to
be increased (made more neutral) to prevent possible damage

to cast iron soil pipe, ABS pipe, septic tanks, plants, wastewater

treatment plants and other materials handling waste water.

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Features Ratings & Dimensions (in inches)

Item Description Model MBH GPH A B C D E F

1 PVC tubing lled with 1/2” and 3/4” aggregate calcium carbonate CNS-2 200 2 15 2 ¾ 3 ⅞ N/A 2 ¼ 2 ¼
2 Channel strut mounts CNS-6 600 6 14 ¼ 4 6 10 ¾ 3 ½ 2 ½
3 Galvanized strut clamps, bolts and nuts CNS-10 1,000 10 19 4 6 16 ⅛ 3 ½ 2 ½
4 Condensate outlet hose barb tting
5 Condensate inlet hose barb tting CNS-30 3,000 30 24 ½ 5 6 21 4 ½ 3 ⅛
6 Plugged – alternate location for condensate inlet hose barb tting

3/4” hose barb x 1/2” NPT

Applying CNS tubes

Condensate can be collected from ueways and boiler/water
heater condensate trap outlets. Use 1 CNS per condensate drain
tube for each connection. DO NOT combine condensate lines
from ueways with those from boiler/water heater condensate
traps. Match the CNS to the Boiler/Water Heater MBH ratings

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CNS-20 2,000 20 19 ½ 5 6 16 ⅛ 4 ½ 3 ⅛

(see Ratings and Dimensions chart). Locate the CNS tube
below the condensate connection and slightly above the oor
drain or inlet to a condensate pump reservoir (if used).

Follow the guidelines in this manual, the boiler/water heater
manual and all applicable local codes when installing, using and
maintaining CNS tubes.

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