Table of Contents
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Water Heater Manual
Installation
and Operating
Instructions for
Natco
Fire Coil
These instructions are to be stored in the pocket provided on the boiler.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
WARNING
Improper installation, adjustment, alteration, service or maintenance can cause injury or property damage. Refer to this
manual. For assistance or additional information consult a qualified installer, service agency or the gas supplier.
FOR YOUR SAFETY - WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor's telephone. Follow the gas suppplier's information.
• If you cannot reach your gas supplier, call the fire department.
T Y
G H
M I
M
E R
T H
VW, PW and IW
Volume Water Heaters
Sizes 500-1825
N
N
ATCO
ATCO
Document 2105
Models
T Y
G H
M I
M
E R
T H
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Related Manuals for Natco VW
Summary of Contents for Natco VW
- Page 1 Operating Instructions for Natco Fire Coil Models VW, PW and IW Volume Water Heaters Sizes 500-1825 These instructions are to be stored in the pocket provided on the boiler. FOR YOUR SAFETY Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
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Page 2: Table Of Contents
2G. Water Expansion ..........9 Figure 11 Hot Water Supply System for 2H. Pump Performance and Installation ....10 Models VW and PW ......11 Water Pressure ..........14 Figure 12 Hot Water Supply System using Tank Installation ..........14 Model PW with Dual Tanks, 2K. -
Page 3: Section 1. General Information
70 and/or in Canada CAN1-B149 requirement. *Model PW water heaters are basically the same as the VW series except that the PW heaters come with integrally mount pumps. *Model IW water heaters are tankless instantaneous heaters, complete with mount pump for use in applications having a suitable diversity in heater load. -
Page 4: Flow Requirements
Water Chemistry inspection. There must also be minimum distances maintained from combustible surfaces. These Natco equipment is designed for use in a wide clearances also apply to non-combustible materials variety of water conditions. The water velocity because the heater requires air circulation for proper maintained in the heat exchanger tubes is kept high operation. -
Page 5: 2B. Installation Of Indoor Heaters
Concrete Slab Must Extend Out A Minimum Of 12" On All Sides Base Must Extend Out Metal Plate 20 Min. 12" On All Sides Ga. Min. Of Heater Frame Under Entire Heater Unit (End View) Unit Base Base For Combustible Floors Concrete Slab - 4"... -
Page 6: Venting
2B-2. Venting draft action of the venting system. This could cause flue products to accumulate in the heater 1. Natco heaters have built-in draft diverters for room. Additional air must be supplied to natural draft operation and must not be compensate for such exhaust. -
Page 7: 2C. Installation Of Outdoor Heaters
1. Verify that the heater is fitted for the proper type The installation should be in accordance with the of gas by checking the rating plate. Natco heaters latest edition of ANSI Z223.1 and/or, in Canada, are normally equipped to operate below a 2000 CAN1-B149 requirement and any local codes foot altitude. -
Page 8: 2E. Electrical Wiring
attached. 2. Use the figures in Table III to provide adequate 5. Provide gas supply pressure to the heater as gas piping from the gas meter to the heater. follows: Natural Gas Table III. Gas Piping Sizes Min. (inches Per Rating Plate water column) Distance from Gas Meter or Last Stage Regulator... -
Page 9: Water Piping Of System
provided with an appropriate transformer. 3. Pressure relief valve lever must be tripped at 2. Wire the heater and pump exactly as shown in least once a year to insure that waterways are the wiring diagram supplied with the heater. clean. -
Page 10: Pump Performance And Installation
6 elbows or 30 feet of pipe, use pipe fittings in the loop no smaller than the 4. Model VW, PW and IW heaters are not suitable following: for heating swimming pools or any other... - Page 11 PW Series VW Series 24" Min. With Horizontal Drain Tank Bldg. Loop Circ. Drain Pump Service Valves Cold To Drain Water NOTES: Heavy line indicates Heater to Tank Circulating Loop. Figure 11 – Hot Water Supply System (Model VW & PW)
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Page 12: Hot Water Supply System Using Model Pw With Dual Tanks, Building Loop Return And Circulating Pump
Conventional Hot Water Tank Hot Water Return To Building From Building Service Valve Check Valve Cold Water Return Supply Loop Pump (see note 2) Conventional Tank Service Valve To Drain Recommended Increasing One Pipe Size From C.W. Connection To Tanks To Drain Pressure Relief... - Page 13 Model IW Water Heater Flow Switch - This Seqment Of Piping Factory Mounted Must Be Same Size As and Wired Water Heater Connection Service Valves For Heater Isolation Building Loop To Minimum Pipe Size 1" Thru 850 1-1/4" 1010 Thru 1825 Building Loop Supply Drain...
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Page 14: Water Pressure
This could result in rapid scaling of provided for circulation of water between Model the heater. VW heaters and the storage tank. This pump must be sized to avoid excessive temperature IMPORTANT: Check oil level in pump before starting. -
Page 15: Section 3. Operation
2. Operating Controls: a. Electrically Operating Controls: Operation Single, two-stage, four-stage or modulating aquastats are provided in models VW, PW Controls - General and IW heaters to control the desired service water tempera-ture. The temperature sensing bulb is located either in the heater 1. - Page 16 I – Circulating Pump for 180° Building Loop Cold Water J – Circulating Pump for 140° Building Loop K – Service Valves to isolate Heater and Pump for Service Figure 16 – Two-Temperature Hot Water Supply System (Model VW or PW)
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Page 17: Two-Temperature System
H – Throttling Valves in Building Loop Returns J – Circulating Pump for Return Loop K –Service Valves to Isolate Heater and Pump for Service Figure 17 – Two-Temperature Hot Water Supply System with Vertical Tank for Models VW and PW Water Heaters... -
Page 18: Modu-Snap Valve Temperature Settings
4. Flow Switch: Standard on all models: Models VW and PW, the switch is mounted in the outlet “tee” connection. Model IW, the switch is mounted directly in the header outlet. The flow switch shuts down all burners in case of low water condition or pump failure. -
Page 19: Initial Start-Up
cutoff, etc.) pilot(s) can be lit following the procedure located on the heater rating plate. 3. Once the pilot(s) is lit and has been established Pilot Valve for five minutes, the flame failure response time should be checked as follows: Systems 4 and 9 - (Intermittent ignition), natural gas only: With this system pilots are automatically lit when the operating controls call for heat. -
Page 20: To Turn Off Heater
Section 4 Maintenance 1. Lubricate the water circulating pump (see instructions found on the pump). 2. If a strainer is employed in a pressure reducing valve or in piping, clean it every six (6) months. 3. At start-up and every six (6) months thereafter, the pilot and main burner flame should be Pilot Reset observed for proper performance (see Figure... -
Page 21: Section 5. Troubleshooting And Analysis Of Service Problems
exchanger can be checked by locating a mirror year and replaced when necessary. The basic under the burners with a flashlight. An alternate controls are: method is to remove the venting and top panel as a. Water temperature controls. necessary to inspect from above. Also check the vent system for defects at this time. - Page 22 II. HEATER IS POUNDING, KNOCKING OR I. HEATER WILL NOT FIRE EMITTING STEAM FROM RELIEF VALVES. Possible Cause What To Do Possible Cause What To Do A. Electric power is off A. Check to see that main power A. Low or no water flow. A.
- Page 23 IV. SOOT IN FLUEWAYS OR IN TUBES, OR V. WATER DRIPPING NOXIOUS FUMES INDICATIVE OF BAD IN FIREBOX COMBUSTION Possible Cause What To Do Possible Cause What To Do A. Combustion air supply to heater A. Check air supply opening. Look Tub in heat exchanger has A tube failure is almost always room is inadequate.
- Page 24 National Combustion Company, Inc. 104-07 180 Street, Jamaica, NY 11433 • (718) 291-8400 FAX (718) 291-6870 Litho in U.S.A. © 0610...