background image

12

SNA-Series Tankless Heater

 Installation

10/17/2014 

Keltech • 

215-1815 Rev. B; ECN 130011

Maintenance 

Preventative maintenance is important for optimal performance of the heater . To ensure the heater works properly, always keep 
the inside of the enclosure dry . Moisture inside an enclosure increases the humidity, which condenses on cooler surfaces . This 
can cause electrical problems and reduce the efficiency of enclosure insulation . To prevent problems perform the following:
•  Keep interior of enclosure dry .

•  Seal any weeping leaks in seals or walls . Verify there are no leaks in seals of enclosure and that in high humidity 

environments all enclosure egresses are properly sealed .

•  Ensure plugs are in place on back side of enclosure .

• 

Monitor Shower heater performance at each routine safety shower inspection.

•  Verify the following lights illuminate with activation of the Shower or Eye/FaceWash:

•  Green bank energized lights
•  Digital display controller
•  Red element load lights 1-4
•  Green power light illuminated

•  Verify that the heater activates the "TepidGuard" discharge port by purging water whenever the shower is deactivated . If 

heater does not perform as expected, take appropriate corrective action by evaluating the cause and repair as necessary .

•  Check seals monthly during temperatures above 32°F (0°C) and weekly during temperatures below 32°F(0°C) . Check 

internal freeze protection system(ENHT, ENHT30)  prior to first seasonal freeze for proper performance . The external 
heater and internal thermostat are factory set at 55°F(13°C) .  Check operation weekly during temperatures below 
32°F (0°C) . See Information in Product Options section for additional information on freeze protection . 

•  Manual Reset Safeties mounted to the 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 temperatures above 100°F(38°C), causing the manual reset safeties to trip . Reset Manual Safeties 
and lower heat trace temperature to below 100°F .

Troubleshooting for Controller

Problem Solution

No 
Power

Verify power is on .
Check continuity of all internal fuses in control transformer, heating elements or optional Fused 
Disconnect circuits .
Check all field service circuit breakers or fuses .
Check the safety interlock door switch to make sure that it is not due to misadjustment or open enclosure door .
Check system temperature limit control to make sure it has not activated due to excessive heat 
exchanger temperature or faulty sensor .
Check for loose or disconnected wires .
Check the incoming service connection . Voltage must match name plate rated voltage . Labels are located 
on the cabinet door (SCCR) and on upper left of back plate (Serial Number Label) .

…continued from previous page

EXP2 (

Explosion Proof Purge System): Keltech's EXP2 option makes heaters compliant for classified areas; 

Class I Division 2, Groups A–D, T5 . The Purge System requires a supply of clean instrument air or inert gas 
(provided by installer) . This supply maintains a positive internal pressure and prevents the enclosure from filling with 
flammable gasses, dusts or vapors from the ambient environment . Complete installation provided in this manual .

FDS Fused Disconnect: 

Internal fused disconnect interlocks with enclosure door when energized, prohibiting access 

to a live cabinet . Select the FDS option for an additional level of safety and convenience at the heater location .

HLW

 (ASME Certified Heat Exchanger): Available on SNA-63 and larger . The heat Exchanger is made of special 

brass and certified by ASME inspector for quality of workmanship . 

Содержание SNA-108

Страница 1: ...Options 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 installation file this manual with the owner or maintenance department Compliance and conformity to local codes and ordinances is the responsibility of the installer Separate parts from packaging and...

Страница 2: ...intended 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 quarterly basis General Information The Keltech Tankless Water Heater provides instant and precise temperature controlled hot water To insure proper performance install the heater according to the follo...

Страница 3: ... heaters 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 protection option If the heater is stored where the temperature could fall below 45 F 7 C the heater must be powered immediately after hydro testing to ensure internal freeze protection components are ac...

Страница 4: ...emperature 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 apply line pressure to heater Open fixture connected to the heater outlet for 5 minutes or until all air has been removed from the heater Fixture can be closed and power restored to the heater For best r...

Страница 5: ...ystem 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 Type Valves Drain pipe Elbows nipples and fittings as needed Dim A Dim B Dim C 36kW 60 1524 48 1219 36 914 54kW 60 1524 48 1219 36 914 63kW 72 1829 60 1524 48 1219 72kW 60 1524 48 1219 36 914 108kW ...

Страница 6: ...e 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 Model Voltage Amps kWatts Min Wire Size SNA 363 600D 600 35 36 8 AWG SNA 543 600D 600 52 54 6 AWG SNA 633 600D 600 61 63 4 AWG SNA 723 600D 600 69 72 4 AWG SNA 1083 600D 600 104 108 2 AWG SNA 1263 600D...

Страница 7: ...lief 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 th...

Страница 8: ...cet 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 plumbing and electrical are complete per Start Up Check List IMPORTANT If your heater is mounted in an area where freezing temperatures are possible an ENHT Freeze Protection Option should be specified He...

Страница 9: ...ome 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 Contact Factory Disabled on SNA Models C or F C_F1 Change Temperature Units from F to C Output Indicators 1 5 Output 1 2 3 4 or 5 are active and operating if these LEDs are illuminated Setpoint Temperature...

Страница 10: ...imately 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 elements if the inlet water temperature is equal to or greater than the temperature set on the digital controller If the water flow exceeds maximum heating capacity of the heater the temperature of water at the ...

Страница 11: ...r 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 in working order 3 Press the GF Reset button hold for 2 seconds and release to reset ground fault NOTE If a trip occurs under normal operation DO NOT RESET Ground Fault without evaluation and service...

Страница 12: ...the 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 temperatures above 100 F 38 C causing the manual reset safeties to trip Reset Manual Safeties and lower heat trace temperature to below 100 F Troubleshooting for Controller Problem Solution No Power Ve...

Страница 13: ...ndicated 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 Decrease water temperatures and restart Follow the schematic to perform the following continuity checks Emergency stop switch Door guard High temperature bimetals Manual Reset Safeties Optional ground fault...

Страница 14: ...inlet 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 into PE must be plugged and properly sealed to minimize leakage of purge air Use hazardous location sealing fittings suitable for Class I locations within 18 of enclosure See Figure 6 3 There are two ...

Страница 15: ...sure 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 installed No valves shall be permitted between the alarm actuator and the enclosure Intrinsically Safe IS Installation FIGURE 7 1 Electrical equipment connected to associated apparatus should not use ...

Страница 16: ...proved 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 EXP2LC and EXP2 Systems 1 Open the air or gas supply shutoff valve 2 Adjust the Flow Control Valve FCV so that the enclosure pressure rises to the point where the Pressurized indicator turns green 3 Low...

Страница 17: ...alarms 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 replace it as necessary Periodic Maintenance Every 18 24 months At least every two years the following additional checks are recommended Apparatus Heater Purge Systems Alarms etc is suitable for the...

Отзывы: