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7

Installation 

SNA-Series Tankless Heater

Keltech • 

215-1815 Rev. B; ECN 130011 

10/17/2014

Start Up Check List

4

Plumbing

  System is set in a vertical, level, and upright position with the outlet located at the top . System is mounted by 

legs (2) bolted to the floor (3/8" dia . minimum) . 

  Confirm Installation of shutoff valve above (upstream of) the union on the inlet connection .  Confirm Installation of 

a Y-strainer (100 mesh screen) or inline filter (150 micron) between the inlet shutoff valve and the heater . 

  Pressure and temperature relief valve is installed on tepid water outlet immediately following the union . No valve 

or restriction is between the relief valve and the system or the relief valve and drain . Shutoff valve is installed 
after pressure and temperature relief valve on outlet if required by local or national plumbing codes .  

  If the hot water process is not at the highest point in the plumbing loop, then an automatic air vent valve must be 

added at the highest point in the system plumbing loop to eliminate trapped air .

Electrical

  Verify supply voltage matches the indicated voltage on the Serial Tag . Serial Tag is located within the heater 

enclosure on the upper right corner of the back plate (mounting plate) . Voltage can also be verified on the SCCR 
Tag on the door of the heater .

  Appropriate conduit is installed properly, secured and sealed to unit enclosure per NEC and hazard 

location requirements  .

  Appropriate conductors for unit routed through conduit and secured to power block inside the enclosure 

(See Table 1) . All electrical is installed in accordance with national and local electrical codes, including fuse 
size and rating .

  Appropriate earth ground is installed to the lug provided on enclosure backplate .

Summary of Contents for SNA-36

Page 1: ...ptions 11 12 Maintenance 12 Troubleshooting 12 13 Special Installation Operating Instructions 14 17 IMPORTANT Read this entire installation manual to ensure proper installation When finished with the...

Page 2: ...ntended service Frequency of cleaning and inspection depends upon local water conditions For heaters with adjustable output temperatures check and adjust as needed at initial installation and on a qua...

Page 3: ...eaters from Rain or other falling precipitation via tarp or other waterproof media Runoff and accumulation of groundwater from any source that may exceed 1 inch NOTE For heaters with ENHT freeze prote...

Page 4: ...mperature relief valve on hot water outlet immediately following the union NOTE Valve must empty into a drain See Figure 2 B Remove air by re installing drain plugs and open inlet supply valve to appl...

Page 5: ...stem or at any drop to eliminate trapped air Components Needed 5 Union 1 1 4 Shutoff Valve Pressure and Temperature Relief Valve 150 psi Y Strainer 100 mesh or Inline Filter 150 microns 2 Gate or Ball...

Page 6: ...rating for each heater CAUTION To avoid damage to the electronics or internal wiring do not perform any brazing or sweat soldering inside the enclosure ELECTRICAL SPECIFICATIONS FOR HEATER PHASE 3 Mo...

Page 7: ...ief valve on outlet if required by local or national plumbing codes If the hot water process is not at the highest point in the plumbing loop then an automatic air vent valve must be added at the high...

Page 8: ...et shower etc then flush the system for 5 minutes to ensure all air is purged from the system CAUTION Failure to bleed air properly will damage elements and cause heater malfunction Be sure that plumb...

Page 9: ...me page Advance Key Advances through parameter prompts Auto Man Off C r71 Turns Control Loop On Manual Off Disabled on SNA Models XX X h Pr1 Heater Power Disabled on SNA Models no AUt1 Autotune Contac...

Page 10: ...e of approximately 10 psi For example if the high limit pressure is 40 psi adjust the low limit pressure to 30 psi with the pressure switch located on the supply pump Heater will not energize heating...

Page 11: ...fault After turning on water then power test ground fault 1 Press GF Test button 2 Watch for ground fault light to illuminate and Bank Ready light s to shut off The Ground Fault system is active and...

Page 12: ...he heat exchangers may trip at temperatures below 32 F on heaters equipped with ENHT or ENHT30 Manual resets are set to trip at 100 F 38 C Heat trace installed on connected piping can heat water to te...

Page 13: ...dicated Bank 1 2 on the front bezel Bank 1 on the FLCB Bank 3 4 on the front bezel Bank 2 on the FLCB If the light is off and there is power on Check if water temperature is greater than 175 F Decreas...

Page 14: ...nlet fitting here FIGURE 6 EXP2 EXP2LC Installation Notes 1 Any tubing conduit or fittings connected to the Pressurized Enclosure PE must conform to local codes for flammability ratings 2 All egress i...

Page 15: ...ure and the protective gas supply The alarm actuator shall be mechanical pneumatic or electrical Electrical alarms and electrical alarm actuators shall be approved for the location in which they are i...

Page 16: ...roved the interior of the PE is gas free and checked that the Pressurized indicator is green Commissioning Test Commissioning Leakage Compensation LC and Continuous Flow High Purge Keltech Options EXP...

Page 17: ...larms function correctly Check the Relief Valve and any other Spark Arrestors Remove any debris or corrosion or replace the Spark Arrestor Check the condition of the air supply filter element Clean or...

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