Hoffman 2" 21 Tempering Valve (140°F - 200°F) : User Guide : Page 4

1. Disassemble

a. Secure all water flow and allow tempering

valve to cool.

b. Unscrew and remove Bonnet (8). Do not

remove the Pushrod assembly (5) from the Bonnet.

c. Remove the Post Stat Assembly (1) and

Overheat Spring Assembly (4).

d. Remove Piston (3).

2. Clean (Only if parts are dirty or have scale build-up)

a. Clean all contact surfaces with a crocus cloth.

b. If all parts are clean and free moving, and the

tempering valve still doesn’t operate, the Post

Stat Assembly (1) has probably lost charge and

must be replaced.

3. Reassemble

a. Install the Body O-Ring (11), Spring (2) and Piston

(3) in the Valve Body (13).

b. Install the Post Stat Assembly (1) and Over-

heat Spring Assembly (4). Ensure that the

movable end of the Overheat Spring Assembly

faces the Bonnet (8).

c. Make sure gasket surface areas are clean.

Lubricate new gasket (7) with a high temperature

silicone-based lubricant and install it.

d. Install Bonnet (8) with Pushrod Assembly (5&6).

e. Return to Service and readjust temperature

following Step 2 on page 3.

3500 N. Spaulding Avenue

Chicago, Illinois 60618

tel: 773 267-1600

fax: 773 267-0991

www.hoffmanspecialty.com

Printed in U.S.A. 1-05 511555

MAINTENANCE

SCHEDULE:

• Initially and every 6 months thereafter.

• Replace tempering valve every 15 years.

More frequent replacement of the tempering

valve is required if it is used in locales where

significant water treatment is required, or where

more frequent cleaning is necessary.

PROCEDURE:

1. Inspect joints for leaks. Stop all leaks by

tightening the bonnet.

•Turn off water before servicing tempering

valve.

•To prevent serious burns, wear heat resistant

gloves when opening and closing valves or

handling hot equipment.

Failure to follow this caution could cause

personal injury.

!

CAUTION

If tempering valve fails to regulate temperature, proceed as follows:

TROUBLESHOOTING & SERVICE (cont’d)

To prevent serious burns, personal injury or death,

ensure that the movable end of the Overheat Spring

Assembly faces the Bonnet.

Failure to follow this warning can cause serious

burns, personal injury or death.

!

WARNING

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Piston for

3/4" and 1" units

or

Piston for

1 1/4" — 2" units

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Movable

End

4

1

10

9

8

6

4

1

3

7

2

13

11

12

5

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