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lp-770 Rev. 000 Rel. 000 Date 6.21.21

3

Part 1 - General Safety Information

This water heater is approved for indoor installation only and is 

not intended for use as a pool heater. Clearance to combustible 

materials: 0” top, bottom, sides, and back. Heater must have 

room for service: 24” front and 6” sides are recommended service 

clearances. (A combustible door or removable panel is acceptable 

front clearance. A 3” minimum clearance must be provided from 

the appliance front cover to the removable panel or combustible 

door.) This water heater has been approved for closet installation 

and installation on combustible flooring. Do not install directly on 

carpeting. Install the water heater in a location where temperature 

and pressure relief valve discharge or a leak will not result in damage 

to the surrounding area. If such a location is not available, install an 

auxiliary catch pan.

Table of Contents

Part 1 - General Safety Information 

3

A. Operation and Installation Warnings 

3

B. When Servicing the Water Heating System 

4

C. Water Chemistry Requirements 

4

D. Freeze Protection 

4

E. Water Temperature Adjustment and Scalding 

4

Part 2 - Prepare the Water Heater 

5

A. Locating the Water Heater 

5

B. Clearances for Service Access 

6

C. Product Selection - Performance and Sizing Guidelines                7

D. Anode Rod 

7

E. Technical Specifications 

8

Part 3 - Piping 

10

A. General Plumbing Guidelines 

10

B. Backflow Preventer 

10

C. Potable Expansion Tank 

10

D. Pressure Drop Sizing For Circulator 

10

E. Boiler Connections 

10

F. Hot Water Outlet 

10

G. Domestic Piping Inlet 

11

H. Temperature and Pressure Relief Valve 

11

I. Applications 

12

Part 4 - Heater Control and Wiring 

13

A. Control 

13

B. Wiring 

13

C. Wiring Diagrams 

13

Part 5 - Start-Up and Operation 

15

Part 6 - Maintenance and Troubleshooting 

17

Limited Warranty 

19

Customer Installation Record Form 

21

Installer - 

Read all instructions in this manual before installing. 

Perform steps in the given order.

User -

 This manual is for use only by a qualified heating installer 

/ service technician. Have this water heater serviced / inspected 

annually by a qualified service technician.

FAILURE TO ADHERE TO THE GUIDELINES ON THIS PAGE 

CAN RESULT IN SUBSTANTIAL PROPERTY DAMAGE, SEVERE 

PERSONAL INJURY, OR DEATH.
NOTE: 

Obey all local codes. Obtain all applicable permits before 

installing the water heater.

NOTE: 

Install all system components and piping in such a manner 

that does not reduce the performance of any fire rated assembly.

A. Operation and Installation Warnings

To avoid serious injury or death, read, understand, and follow all of the 

precautions listed here.

Vapors from flammable liquids will explode and can cause a fire, 

resulting in personal injury or death. DO NOT use or store flammable 

liquids around the water heater.

DO NOT allow children to operate this unit. DO NOT use this unit if 

it does not appear to be operating correctly. A qualified technician 

should service and inspect the water heater annually.
This water heater must be installed by a licensed plumber, licensed 

gas fitter, and/or professional service technician. Improper installation 

and/or operation can cause a potentially hazardous situation, which, 

if not avoided, could result in serious injury or death, and will void 

the warranty.
The manufacturer cannot anticipate every circumstance that might 

involve a potential hazard. Each installation has its own specialized 

characteristics, requirements, and possible hazards. Therefore, all 

possible incidents are not included in these warnings. Proper and 

safe installation, operation, and service are the responsibility of the 

professional service technician.
Proper care of the water heater is the user’s responsibility. Ensure the 

user carefully reads and understands this manual before operating 

and maintaining the water heater.
No one but a professional service technician should attempt to install, 

service, or repair this water heater. There are no serviceable parts 

which can be changed by the user / owner. User / Owner: Contact 

the original professional service technician if the water heater needs 

repair or maintenance. If the original technician is unavailable, ask 

your utility for a list of qualified service providers.
Keep the area around the water heater clean and free of all materials 

that can burn. DO NOT store or place gasoline, oils, spray paint, or 

other flammable products near the water heater.
After installation, all water heater safety devices should be tested.

This water heater is certified for indoor installations only. Carefully 

consider installation location and the placement of critical 

components (circulators, etc.) before installing the water heater.
The water heater temperature is factory set to 125

o

F (51.7

o

C). To 

avoid scalding, always check the temperature of the hot water 

before bathing, showering, washing, etc. DO NOT adjust the water 

temperature while the water heater is being used by other persons.

The owner should inspect the system monthly for damage, water 

stains, signs of rust or corrosion. If inspection of the unit shows signs 

of damage, the water heater should be shut off until the problem is 

repaired by a qualified technician.

Any claims for damage or shortage in shipment must be filed 

immediately against the transportation company by the consignee.
This water heater provides a overheat shutdown limit. In the event 

the water heater water exceeds the set point of the control limit, 

the cutoff will trip and the water heater will shut down. Certain local 

codes require additional temperature limits. In addition, certain 

types of systems may operate at temperatures below the minimum 

set point of the limit provided with the water heater. Contact the 

manufacturer for additional overheat controls.

Summary of Contents for SSC-20TC

Page 1: ... 02745 www htproducts com lp 770 Rev 000 Rel 000 Date 6 21 21 NOTICE HTP reserves the right to make product changes or updates without notice and will not be held liable for typographical errors in literature NOTE TO CONSUMER PLEASE KEEP ALL INSTRUCTIONS FOR FUTURE REFERENCE WARNING Improper installation adjustment alteration service or maintenance could void product warranty and cause property da...

Page 2: ...ment installations the commanding officer or departmental official may be the AHJ NOTE Themanufacturerreservestherighttomodifyproducttechnical specifications and components without prior notice For the Installer This water heater must be installed by qualified and licensed personnel The installer should be guided by the instructions furnished with the water heater and by local codes and utility co...

Page 3: ... heater DO NOT allow children to operate this unit DO NOT use this unit if it does not appear to be operating correctly A qualified technician should service and inspect the water heater annually This water heater must be installed by a licensed plumber licensed gasfitter and orprofessionalservicetechnician Improperinstallation and or operation can cause a potentially hazardous situation which if ...

Page 4: ... to treat the water Various solutions are available to adjust water quality Adverse water quality will affect the reliability of the system In addition operating temperatures above 135o F will accelerate the build up of lime scale and possibly shorten appliance service life Failure of an appliance due to lime scale build up low pH or other chemical imbalance IS NOT covered by the warranty The wate...

Page 5: ...ation company by the consignee Carefully consider installation when determining heater location Please read the entire manual before attempting installation Failure to properly take factors such as heater venting piping condensate removal and wiring into account before installation could result in wasted time money and possible property damage and personal injury This water heater is certified for...

Page 6: ... where it will not be exposed to freezing temperatures All piping should be insulated Additionally place the water heater so that the drain controls and inlets outlets are easily accessible NOTE To save on heating costs and improve energy efficiency keep the distance between the boiler and water heater to a minimum to reduce heat loss from excess piping and keep friction loss at a minimum Ensure a...

Page 7: ...mpoo 4 X Hand Dish Washing 4 X Automatic Dish Washing 14 X Food Preparation 5 X Wringer Clothes Washer 26 X Automatic Clothes Washer 32 X Total Peak Hour Demand Table 3 Water Heater Performance and Sizing Guidelines Model Units 20 32 40 50 Tank Capacity Gallons 21 2 31 7 42 3 52 9 Minimum Recommended Power BTU Hr 75 000 95 000 115 000 140 000 Maximum Working Pressure PSI 150 Maximum Temperature oF...

Page 8: ...nection Diagrams Figure 3 Dimensions Model SSC 20TC SSC 32TC SSC 40TC SSC 50TC A 22 B 28 7 37 45 3 54 C 27 35 3 43 6 52 25 Table 4 Dimensions 2 0 4 0 6 0 8 0 10 0 5 GPM 8 GPM 12 GPM Primary Flow Rate Head Loss FT HD PressureDrop Graph 20 32 40 50 50 32 40 20 Figure 4 Pressure Drop Graph Model Primary Flow Rate GPM Unit 5 8 12 SSC 20TC 1 2 2 9 6 2 ft hd SSC 32TC 1 6 3 8 8 0 SSC 40TC 3 6 7 6 SSC 50T...

Page 9: ...0 000 188 134 219 155 165 000 236 167 Table 7 32 Gallon Model Performance Data Continuous Draw Ratings Based Upon Boiler s Ability to Maintain 180oF Model 40 Gallon Circulator Flow GPM 5 5 8 8 12 12 DHW Temperature 120oF 140oF 120oF 140oF 120oF 140oF Boiler Heating Capacity in BTU Hr Output 45 000 110 82 110 82 60 000 138 101 138 101 75 000 166 120 166 120 95 000 172 124 192 138 202 145 115 000 17...

Page 10: ...ergy efficiency and reduce piping heat loss All plumbing must be in accordance with the requirements of the authority having jurisdiction Use both thread tape and pipe dope on all mechanical con nections Zone valve if used and circulator must be sized to provide minimum flow rate specified in the table to the right Flow Specifications Use 1 inch nominal copper tubing for flows greater than 7 GPM b...

Page 11: ...e discharge to any location where freezing could occur No valve may be installed between the relief valve and heater or in the discharge line Do not plug or place any obstruction in the discharge line Test the operation of the relief valve after filling and pressurizing the system by lifting the lever Make sure the valve discharges freely If the valve fails to operate correctly immediately replace...

Page 12: ...ir from system 5 This drawing is meant to demonstrate system piping only The installer is responsible for all equipment and detailing required by local codes In Massachusetts you must install a vacuum relief valve per 248 CMR 6 Mixing valve application is optional but recommended to help prevent scalding A B C D E F G H Legend A Ball Valve Typical B Dielectric Union Suggested C Temperature Pressur...

Page 13: ...d Once the control is operational it is important to make sure the control is maintaining the desired operating temperature B Wiring Wiring is to be done in accordance with all applicable local and state codes Turn off all power related to the boiler before starting any wiring procedures It is recommended that a disconnect switch be installed between the boiler control and the water heater CAUTION...

Page 14: ...l 000 Date 6 21 21 14 Figure 8 Zoning with Circulators R8182D and R845A Relay Figure 9 Zoning with Circulators Using L8124 E F and R845A Relay Figure 10 Using L8148A or L8152A Cold Start Boiler Control with Circulators ...

Page 15: ...a thermostatic mixing valve be used to protect the user from potential hazard due to spikes in temperature A mixing valve in conjunction with a high temperature setting may be used for high demand applications spas hot tubs whirlpools It is important to check the output temperature of any water heater with a thermometer to insure that the setting is correct 6 When the system is completely flushed ...

Page 16: ...omestic cold water supply valve 3 Open the household hot water taps 4 Attach a hose to the drain valve located at the bottom of the heater and drain the heater 5 Unscrew the anodes EXAMINE THE ANODES AND REPLACE IF THE DIAMETER IS LESS THAN 0 40 INCHES 6 Replacement of the Anodes The use of PTFE tape is recommended to ensure watertight connection of the anodes NOTE Some water conditions may necess...

Page 17: ...ischarges Hot Tubs Spas Multiple Showers High Demand Problem Possible Solution Problem Possible Solution Tank temperature too high Lower tank temperature Pressure too low Check line pressure for restriction Water expands when heated Install expansion tank Tank recovery slow Slow startup boiler See chart Water pressure too high Install pressure reducing valve Not enough hot water Boiler sized too s...

Page 18: ...pressly agreed between HTP and the Owner that repair replacement or refund are the exclusive remedies of the Owner OWNER RESPONSIBILITIES The Owner or Installer must 1 Have a relief valve bearing the listing marks of the American Society of Mechanical Engineers ASME installed with the water heater assembly in accordance with federal state and local codes 2 Have a vacuum relief valve certified to A...

Page 19: ...on is required and requested by the HTP Claims Departmentyouwillhavethirty 30 daystoprovideit Whenallrequested information is provided HTP will respond within three 3 business days The claim will be automatically closed if requested information is not provided within thirty 30 days Claims will not be reopened without HTP Warranty Supervisor approval During the claims process a product that must be...

Page 20: ...te of Installation Installation Address Product Name Serial Number s Comments Installer s Code Name Installers Phone Number Signed by Installer Signed by Customer IMPORTANT Customer Please only sign after the qualified installer service technician has fully reviewed the installation safety proper operation and maintenance of the system If the system has any problems please call the qualified insta...

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