Smith GT-150 Installation, Operating And Maintenance Manual Download Page 37

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GT INSTALLATION AND OPERATION INSTRUCTIONS

Page 37

The following are the thermister curves for diagnosing
the water and outdoor air sensors.
1. Measure the resistance of the thermister when

disconnected.

2. Using the appropriate chart, fi nd the resistance and

move vertically for the water probe or horizontally for
the air probe until the line is intersected.

3. Move 90 degrees to the corresponding temperature.
4. If the temperature is plus or minus

10°F,

- 12 °C

then the probe is operating correctly.

Summary of Contents for GT-150

Page 1: ...NING If the information in this manual is not followed exactly a fire or explosion may result causing property damage personal injury or loss of life INSTALLER THESE INSTRUCTIONS MUST BE AFFIXED ADJAC...

Page 2: ...d long life for which this boiler was designed these instructions must be read understood and followed Direct all questions to your Smith distributor or to the Customer Service Department 260 North El...

Page 3: ...however 24 in 610 mm is recommended 2 An optimum site will be level central to the hot water piping system and close to an outside wall NOTE This boiler is designed for direct placement on a combustib...

Page 4: ...let System Attachment One of the following materials is to be used for the air intake pipe 3 in 76 mm ABS 3 in 76 mm PVC Sch 40 pipe 3 in 76 mm Galvanized Steel pipe See Table 2 for the maximum equiva...

Page 5: ...mm vent collar to 3 in 76 mm at the boiler Figure 3 Figure 3 Vent Pipe To Boiler Attachment The maximum combined equivalent vent and intake pipe lengths are listed in Table 2 The length specified is t...

Page 6: ...liance will produce a plume of water vapor and should be taken into consideration when selecting an adequate vent terminal location A 3 ft 0 9 m diameter stainless plastic or vinyl shield can be used...

Page 7: ...lations that have to exit the foundation below grade excavate the site as shown in Figure 8 to a point below where the pipes exit the building Maintain the proper vent clearances as outlined above Att...

Page 8: ...ditions must apply 1 If limited to two terminals the horizontal centerline distance must be 4 in 102 mm or greater than 24 in 610 mm to prevent flue gas recirculation For more than two terminals locat...

Page 9: ...terminal must always be a minimum of 12 in 305 mm plus the snow allowance above any surface that will support snow however a snow allowance of 24 in 610 mm is highly recommended Figures 15 16 Consult...

Page 10: ...nsure that the air inlet and vent system lengths are within the maximums specified in Table 2 The debris screens provided with the boiler must be installed in both the air intake and vent terminals In...

Page 11: ...e products such as Fernox Superfloc for new installations and CHR Central Heating Restorer for retrofits Also add an inhibitor to the system water to prevent limestone and magnetite deposits from form...

Page 12: ...diagram to be used as a vacuum breaker and to eliminate air upon filling Figure 21 LWCO Air Vent Piping PRIMARY LOOP PLUMBING This low mass boiler requires a continuous minimum water flow for proper...

Page 13: ...terminals C1 L2 5 See Table 3 for Indirect Water Heater pump flow requirements This pump is wired to terminals AP L2 6 Set pressure reducing valve to 12 psi 83 kPa 7 Use 30 psi 207 kPa relief valve ma...

Page 14: ...nals C1 L2 5 See Table 3 for Indirect Water Heater pump flow requirements This pump is wired to terminals AP L2 6 Set pressure reducing valve to 12 psi 83 kPa 7 Use 30 psi 207 kPa relief valve max Loc...

Page 15: ...tiple Zones Using Pumps Figure 26 Secondary Loop For Multiple Zones Using A Bypass Valve Note Velocity noise may be a problem when the entire output of the system pump is flowing through the zone with...

Page 16: ...he gas valve which can cause a fire or explosion GAS SUPPLY PIPING The GX hot water boiler comes from the factory ready to be piped to the gas supply The National Fuel Gas Code ANSI Z223 1 NFPA 54 and...

Page 17: ...ps with a maximum inrush of 6 amps If the amp draw of the pumps exceeds these maximums a pump controller or isolation relay must be used to prevent damage to the boiler Damage caused by improper wirin...

Page 18: ...uit between terminals T and C shutting down the pumps and the burner Multiple Zones w Taco Valve Controller Models ZVC403 to ZVC 406 Figure 31 shows the basic multiple zoned system using normally clos...

Page 19: ...GT INSTALLATION AND OPERATION INSTRUCTIONS Page 19 Figure 30 Multiple 4 Wire Zone Valves...

Page 20: ...GT INSTALLATION AND OPERATION INSTRUCTIONS Page 20 Figure 31 Multiple Zones w Taco Valve Controller Models ZVC403 to ZVC 406...

Page 21: ...on the pump controller The controller energizes the appropriate circulating pump and closes the circuit between terminals T and C on the Sentry 2100 control The Sentry 2100 provides power to the prima...

Page 22: ...GT INSTALLATION AND OPERATION INSTRUCTIONS Page 22 Figure 33 Boiler Ladder Diagram...

Page 23: ...GT INSTALLATION AND OPERATION INSTRUCTIONS Page 23 Figure 34 Boiler Connection Diagram...

Page 24: ...GT will maintain by increasing or decreasing the input Indirect Water Heaters The Sentry 2100 comes with an input and output for a 120 volt indirect pump When the A and C terminals are closed dry cont...

Page 25: ...ter Error Code On Off NOTE LFS must not be set below 48 on the GT150 model To start the control operation return to RUN on the menu and press Function Normal operation will begin Recommended Settings...

Page 26: ...C 70 F 21 C 1 85 RESET TEMPERATURE HICalc RES Outdoor Air x Reset Ratio RES 70 F 21 C 32 F 0 C x 1 85 70 F 21 C 70 6 F 21 C 70 F 21 C 140 6 F 42 C NOTE The design temperature is 0 F 18 C outside air...

Page 27: ...mmediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control that has been under water NOTE The GT was tested with Natural...

Page 28: ...ystem by turning the thermostat to it s lowest setting and then back to where it was or by momentarily interrupting the electrical power to the boiler D With the burner in operation close the manual s...

Page 29: ...r Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control that has been under water 1 STOP Read the safety informatio...

Page 30: ...s up to 2000 ft 610 m At elevations above 2000 ft 610 m input ratings should be reduced by 4 for each 1000 ft 305 m above sea level Check the input rate as follows NATURAL GAS 1 Turn off all other gas...

Page 31: ...ing at the valve Figure 2 6 Remove the nuts used to attach the burner to the heat exchanger 7 Carefully slide the burner out of the unit 8 Inspect the burner for damage or signs of deterioration Use a...

Page 32: ...bolts 7 Once the unit is level install the bottom two 14 3 lag bolts 8 Remove the Air Inlet Pipe assembly and Metering elbow from the gas valve venturi assembly Figure 44 Figure 44 Air Inlet Pipe Remo...

Page 33: ...calculated using formula in Section 8 1 If the thermostat demand light is turning off the thermostat has satisfied 2 If DHW temp light is turning off the aquastat or call for domestic has been satisfi...

Page 34: ...fan is running air switch may be faulty 4 If fan is not running check 120V wiring to blower if ok remove low voltage harness from blower if blower fails to start replace blower if blower does start p...

Page 35: ...gas valve when it opens If boiler lights check for flame signal between FC1 And FC2 on Fenwal control If lower then 1 2 micro amps see Boiler will not stay lit below Check combustion properties If the...

Page 36: ...vent from the boiler during ignition if unit lights smoothly with intake vent disconnected reconnect and check for proper combustion if unit maintains smooth operation after ignition Calibrate for pr...

Page 37: ...ure the resistance of the thermister when disconnected 2 Using the appropriate chart find the resistance and move vertically for the water probe or horizontally for the air probe until the line is int...

Page 38: ...GT INSTALLATION AND OPERATION INSTRUCTIONS Page 38 Figure 48 Replacement Parts Exploded View SIOM 36...

Page 39: ...8 1 1 24 2 Clamp GT 82100 1 1 25 Sentry 2100 Control GT 82013 1 1 26 Complete Control Panel Assy GT 82754 1 1 27 PCB Optocoupler GT 82754 1 1 1 28 Outdoor Air Sensor 10K GT 81027 1 1 1 29 Transformer...

Page 40: ...WESTCAST INC 260 NORTH ELM STREET WESTFIELD MA 01085 TEL 413 562 9631 FAX 413 562 3799...

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