User Guide

ManualsBrandsHoffman ManualsHeating Supplies2" 21 Tempering Valve (140°F - 200°F)

Adjustable Temperature Range

Model °F (°C)

21 140 – 200 (60 – 93)

21H 100 – 200 (38 – 93)

21LT 100 – 140 (38 – 60)

Installation Instructions

HS-500(B)

• Before using this product read and understand instructions.

•Save these instructions for future reference.

•All work must be performed by qualified personnel trained in the proper application,

installation, and maintenance of plumbing, steam, and electrical equipment and/or systems in

accordance with all applicable codes and ordinances.

• Do not use tempering valves as anti-scald devices.Tempering valves may need to be used

in conjunction with an anti-scald device.

• To prevent serious burns, wear heat resistant gloves when opening and closing valves, or

handling hot equipment.

•Turn off water before servicing valve.

• Open supply valves slowly to prevent water hammer or sudden shock.

Failure to follow this warning can cause serious burns, personal injury or death.

WARNING

Series 21

Tempering Valve

Series 21

OPERATION

Summary of content (4 pages)

PAGE 1
Installation Instructions HS-500(B) Series 21 Tempering Valve OPERATION Adjustable Temperature Range Model °F (°C) 21 140 – 200 (60 – 93) 21H 100 – 200 (38 – 93) 21LT 100 – 140 (38 – 60) Series 21 ! WARNING CAUT WARN ING ION • Before using this product read and understand instructions. • Save these instructions for future reference.
PAGE 2
INSTALLATION – STEP 1 - Determine Where to Install the Tempering Valve ! TYPICAL PIPING DIAGRAMS WARNING To prevent damage to the Post Stat Assembly from excessive heat, remove the assembly and O-ring before soldering near the tempering valve. See page 4 for detailed instructions. Failure to follow this warning can cause serious burns, personal injury or death.
PAGE 3
STEP 2 - Temperature Adjustment 10 2. a. Make sure that the hot water supply temperature to the tempering valve is at least 20°F (11°C) hotter than the desired temperature of the mixed water. b. Operate system and allow temperature to stabilize. c. Loosen nut (10). d. In one-half turn increments, turn adjustment screw: - Clockwise to reduce temperature - Counter clockwise to increase temperature e. Allow the system to stabilize. When temperature reaches desired level, tighten nut (10).
PAGE 4
TROUBLESHOOTING & SERVICE (cont’d) If tempering valve fails to regulate temperature, proceed as follows: 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.