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11

                        

FIGURE 8.

CHEMICAL VAPOR CORROSION

Boiler corrosion and component failure can be caused by the 

heating and breakdown of airborne chemical vapors.  Spray can 

propellants, cleaning sol vents, refrigerator and air conditioning 

refrig erants, swimming pool chemicals, calcium and sodium 

chloride (water softener salt), waxes, and process chemicals are 

typical compounds which are potentially corrosive.  These materials 

are corrosive at very low con centration levels with little or no odor 

to reveal their presence.
Products of this sort should not be stored near the boiler.  Also, air 

which is brought in contact with the boiler should not contain any 

of these chemicals. If necessary, uncontaminated air should be 

obtained from remote or outside sources. Failure to observe this 

requirement will void the warranty.

INSTALLTION CLEARANCES

This boiler MUST NOT be installed on carpeted floors. This boiler 

is approved for installation on combusti ble flooring in an alcove with 

minimum clearances to combustibles of: 

4” (102mm) Rear; 0” (0mm) Top and Sides; 6” (152mm) Vent. 2” (51mm) 

clearance is allowable from combustible construction for hot water pipes.

Sufficient area should be provided at the front and rear of the unit for prop er 

servicing. Service clearances of 24” (610mm) in front, rear, top and sides 

are recommended. In a utility room installa tion, the door opening shall be 

wide enough to allow the boiler to enter or to permit the replacement of 

another appli ance such as a boiler.

LEVELING

Each unit should be checked after in stal lation to be certain 

that it is level.
If the unit is not level, obtain and insert shims under the feet at the 

frame base to correct this condition.

AIR REQUIREMENTS

Breathing Hazard - Carbon Monoxide Gas

Install appliance in accordance with

the Instruction Manual and NFPA 54 or

CAN/CSA-B149.1.
To avoid injury, combustion and ventilation

air must be taken from outdoors.
Do not place chemical vapor  emitting

products near water heater.

Breathing carbon monoxide can cause brain damage or

death. Always read and understand instruction manual.

UNCONFINED SPACE

In buildings of conventional frame, brick or stone construction, 

unconfined spaces may provide adequate air for com bustion.
If the unconfined space is within a build ing of tight construction 

(build ings  using  the  following  construction:  weath er  strip ping, 

heavy insulation, caulk ing, vapor barrier, etc.), air for com bus tion, 

venti lation, and draft hood di lu tion must be obtained from outdoors 

or spaces freely communicating with the outdoors. The installation 

instructions for con fined spaces in tightly con structed buildings 

must be followed to ensure adequate air supply.

UNUSUALLY TIGHT CONSTRUCTION

In unconfined spaces in buildings, infiltration may be adequate to 

provide air for combustion, ventilation and dilution of flue gases. 

However, in buildings of unusually tight construction (for example, 

weather stripping, heavily insulated, caulked, vapor barrier, etc.) 

additional air must be provided using the methods described in 

the Confined Space section that follows.

CONFINED SPACE

A Confined Space is one whose volume is less than 50 cubic feet 

per 1,000 Btu/hr (4.8 cm per kW) of the total input rating of all 

appliances installed in the space.

Openings must be installed to provide fresh air for combustion, 

ventilation and dilution in confined spaces. The required size for 

the openings is dependent on the method used to provide fresh 

air to the confined space and the total Btu/hr input rating of all 

appliances installed in the space.

DIRECT VENT APPLIANCES

Appliances installed in a Direct Vent configuration that 

derive all air for combustion from the outdoor atmosphere 

through sealed intake air piping are not factored in the total 

appliance input Btu/hr calculations used to determine the 

size of openings providing fresh air into confined spaces.

EXHAUST FANS

Where exhaust fans are installed, additional air should be provided 

to replace the exhausted air. When an exhaust fan is installed in 

the same space with a water heater, sufficient openings to provide 

fresh air must be provided that accommodate the requirements 

for all appliances in the room and the exhaust fan. Undersized 

openings will cause air to be drawn into the room through the 

appliance vent system causing poor combustion. Sooting, serious 

damage to the appliance and the risk of fire or explosion may result. 

It can also create a risk of asphyxiation.

LOUVERS AND GRILLES

The free areas of the fresh air openings in the instructions 

that follow do not take in to account the presence of louvers, 

grilles or screens in the openings.
The required size of openings for combustion, ventilation and 

dilution air should be based on the “net free area” of each opening. 

Where the free area through a design of louver or grille or screen 

is known, it should be used in calculating the size of opening 

required to provide the free area specified. Where the louver and 

grille design and free area are not known, it should be assumed 

that wood louvers will have 25% free area and metal louvers and 

grilles will have 75% free area. Non motorized louvers and grilles 

should be fixed in the open position.

FRESH AIR OPENINGS FOR CONFINED SPACES

The following instructions should be used to calculate the 

size, number and placement of openings providing fresh air for 

combustion,  ventilation  and  dilution  in  confined  spaces.  The 

illustrations shown in this section of the manual are a reference 

Summary of Contents for VF VB 500

Page 1: ...ilding Immediately call your gas supplier from a neighbor s phone Follow the gas supplier s instructions If you cannot reach your gas supplier call the fire department Installation and service must be...

Page 2: ...known to the State of California to cause cancer birth defects or other reproductive harm and requires businesses to warn of potential exposure to such substances This product contains a chemical know...

Page 3: ...3 GENERAL SAFETY...

Page 4: ...al Power 120v 60hz and 30 amps Models VB VW 500 VB VW 750 VB VW 1000 Dimensions inches mm inches mm inches mm Flue Outlet Diameter 6 152 6 152 6 152 Air Intake Diameter 4 102 4 102 4 102 Water Inlet 2...

Page 5: ...9 42 159 2 1 0 6 32 121 1 8 0 5 110 416 4 3 1 3 12 7 32 121 1 8 0 5 40 22 VB 1000 85 322 3 9 1 2 56 212 2 8 0 9 42 159 2 3 0 7 120 454 4 9 1 5 14 8 42 159 2 3 0 7 40 22 Model No Input Rating Btu hr Ou...

Page 6: ...d Ability 10 Location 10 Panels and Covers 10 Chemical Vapor Corrosion 11 Installtion Clearances 11 Leveling 11 Air Requirements 11 Unconfined Space 11 Confined Space 11 Fresh Air Openings for Confine...

Page 7: ...N EXPOSED TO FLOODING IT MUST BE REPLACED Liquefied Petroleum Gas Models Boilers for propane or liquefied petroleum gas LPG are different from natural gas models A natural gas boiler will not function...

Page 8: ...S is a normally closed pressure switch that opens when the air intake is blocked If the BIS is activated check and clear the intake of any obstructions The blocked flue pressure switch BFS activated w...

Page 9: ...emperature Probe allows a boiler to sense the actual water temperature inside the storage tank or hydronic heating loop The boiler will modulate its firing rate in response to the actual system temper...

Page 10: ...g cartridge or linkage T P relief valve should have a temperature rating of 210 F 99 C a pressure rating not exceeding lowest rated working pressure of any system compo nent and a discharge capacity e...

Page 11: ...sure adequate air supply Unusually Tight Construction In unconfined spaces in buildings infiltration may be adequate to provide air for combustion ventilation and dilution of flue gases However in bui...

Page 12: ...ThroughTwoHorizontalDucts FIGURE 9C The confined space should be provided with two permanent horizontal ducts one commencing within 12 inches 300 mm of the top and one commencing within 12 inches 300...

Page 13: ...osure See Figure 9E Each opening should communicate directly with an additional room s of sufficient volume so that the combined volume of all spaces meets the criteria for an Unconfined Space Each op...

Page 14: ...into building or combustion air inlet to any other appliance 6 inches 15 cm for appliances up to 10 000 Btu hr 3 kW 12 inches 30 cm for appliances between 10 000 Btu hr 3 kW and 100 000 Btu hr 30kW 3...

Page 15: ...let into building or combustion air inlet to any other appliance 6 inches 15 cm for appliances up to 10 000 Btu hr 3 kW 12 inches 30 cm for appliances between 10 000 Btu hr 3 kW and 100 000 Btu hr 30...

Page 16: ...sing TWT to exhaust flue prod ucts and PVC piping to bring combus tion air to the boiler from the outside see Figures 12 and 12C 4 Vertical Direct Vent using a vertical vent termination to exhaust flu...

Page 17: ...direct vent installations Standard minimum vertical vent lengthis7feet 2 1m plusBoot Tee SeeFigures11 12A 12B and 12C for differences between standard and direct vent installations 3 An AL 29 C Vent V...

Page 18: ...r parapet it must extend a minimum of 2 610mm above the wall or parapet Joints are not joined to show vent pipe orientation FIGURE 11 VERTICAL TERMINATION FIGURE 11A HORIZONTAL THROUGH THE WALL TERMIN...

Page 19: ...d carbon monoxide detector with an alarm shall be installed APPROVED CARBON MONOXIDE DETECTORS Each carbon monoxide detector as required in accordance with the above provisions shall comply with NFPA...

Page 20: ...nt terminal NOTES If the exhaust vent terminal is within 10 3 0m of a wall or parapet it must extend a minimum of 2 610mm above the wall or parapet Joints are not joined to show vent pipe orientation...

Page 21: ...OR PARAPET ON SIDEWALL VENT INSTALLATION REFER TO FIGURE 9F FOR SPACING SPECIFICATIONS FOR EXHAUST AND AIR INTAKE PIPE INSTALLATIONS CLEARANCES SUPPORT ETC REFER TO FIGURES 12 AND 12A VERTICAL AIR IN...

Page 22: ...red by the warranty 2 EXPANSION TANK If the system is of the closed type install an expansion tank as shown in Figure 13 The sizing of the expansion tank for a closed system is very important and is d...

Page 23: ...ra tion Pipe joint compounds soldering paste grease on tubing and pipe all tend to contaminate a system Failure to flush contaminants from a system can cause solids to form on the inside of boiler exc...

Page 24: ...a suitable main manual shut off valve must be installed in a location complying with those codes Before attaching the gas line be sure that all gas pipe is clean on the inside To trap any dirt or for...

Page 25: ...REQUIRED INSTALL IN PLACE OF THE DRAIN VALVE SHOWN DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE TEMPERATURE AT FIXTURES IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTE...

Page 26: ...ES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT ADD AN ANTI SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES SEE TABLE 8 ONE VF MODEL VW HOT WATER SUPPLY BOILER WITH VERTICAL TANK FIGURE 14 INSTALL I...

Page 27: ...AFE USE TEMPERATURE AT FIXTURES IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT ADD AN ANTI SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES SEE TABLE 8 FIGURE 15 INSTALL...

Page 28: ...3 GREEN GROUND 4 2 TANK PROBE OR 2 ENABLE DISABLE Enable disable can also be used with a 24 volt thermostat Do not use tank probe when using thermostat These connections shall be made at the rear of...

Page 29: ...132 000 13 728 000 12 636 000 11 700 000 11 232 000 10 452 000 9 360 000 8 580 000 7 800 000 7 176 000 kW 10 508 7 219 5 848 4 980 4 432 4 021 3 701 3 427 3 290 3 061 2 741 2 513 2 284 2 102 TABLE 6...

Page 30: ...30 Wiring Diagram FIGURE 17 CONNECTION DIAGRAM...

Page 31: ...31...

Page 32: ...32 FIGURE 18 SCHEMATIC DIAGRAM VB VW 500 750 1000 SCHEMATIC DIAGRAM...

Page 33: ...desired system pressure Close bypass valve and permit pressure to be established by the pressure reducing valve 2 Vent all high points in system to purge system of air Provisions should be made to per...

Page 34: ...further adjustments on the outlet and bypass valves until the desired inlet and outlet water temperatures are reached MANIFOLD PRESSURE CONNECTIONS Take the manifold pressure refer to Table 1 by remo...

Page 35: ...ure On Yes Off No Switch 8 Modulation On NOTE If the unit powers up with the number of stages selected by dip switches exceeding the number of FCBs the MCB will detect this condition and go into a har...

Page 36: ...36 LIGHTING OPERATION INSTRUCTIONS FOR MODELS VB VW 500 750 AND 1000...

Page 37: ...e cap on the gas regulator using a slotted screwdriver This will expose the offset adjustment screw Using a TORX T40 or a 5mm hex wrench carefully adjust the low fire gas setting to achieve the CO2 le...

Page 38: ...is missing or shorted the flame will not be detected OUTPUTS FROM MCB Relay Contact Output Alarm MCB 24VAC optional Provides electrical power to operate an external alarm This can be an audio device...

Page 39: ...splayed 4 The system then compares the temperature read from the controlling probe inlet or tank to the setpoint temperature If the temperature is less than the operating setpoint minus the differenti...

Page 40: ...The MCB has 5 possible states and the FCB have 9 The normal MCB states sequence is to move from Idle to Pre Circulate when a call for heat is initiated Once heat has been satisfied or the Thermostat i...

Page 41: ...ch error has occurred The system waits in this state until the MCB sends a command to clear the error and the system returns to the idle state Cold Purge State Cold purge occurs when the MCB micro com...

Page 42: ...fo Screen Displays the following information Elapsedhoursofoperation Totaltimesystemhasbeenpoweredup Number of running minutes Number of minutes system has been in the run mode kBtu rating of the boil...

Page 43: ...es that a fault has been detected and the system has stopped running It is on continuously for soft faults and flashes for hard faults The Yellow LED indicates that the boiler is in a ready mode waiti...

Page 44: ...ote The MRHL can be checked by disconnecting the outlet probe from the MCB and reading the resistance across the two active pins on the connector at the end of the probe cable The value should be appr...

Page 45: ...tion of the servo pressure regulator Replace the valve and add a gas filter in front of the new valve preventative maintenance This is a pre mix burner system The flame is not supposed to be directly...

Page 46: ...er adapter by first removing the four 4 bolts and subsequently the blower gas kets The blower should be free to move at this point FOR DIRECT VENT UNITS It is necessary to loosen and slide the rubber...

Page 47: ...ystemssolidsexist Asthewaterisheated these tendtodropoutdepositingasscaleorlime Thisscalemustberemoved before the heat exchanger tubes become blocked Deliming The amount of calcium carbonate lime rele...

Page 48: ...48 notes...

Page 49: ...49 notes...

Page 50: ...50 notes...

Page 51: ...is boiler under state or provincial law are limited to one 1 year duration for the boiler or any of its parts Some states and provinces do not allow limitations on how long an implied warranty lasts s...

Page 52: ...52 500 Tennessee Waltz Parkway Ashland City TN 37015 Phone 800 433 2545 www hotwater com E Mail parts hotwater com...

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