SPECIFICATIONS FOR NOVATHERM ’S eVoFlex PACKAGED WATERTUBE
HOT WATER BOILER
A. GENERAL DESCRIPTION
1. Supply, a quantity of ______ Hot Water Boiler(s) from Novatherm. Each boiler shall be complete with all components and accessories, as indicated. Each boiler unit shall be a Novatherm eVoFlex Model _______ from the PowerFlex he family.
2. The capacity of each boiler unit is rated for a nominal output of _____ HP or
_____ MMBbu/hr of hot water at _____ °F outlet and _____ °F inlet. The design pressure of the boiler is 160 psig and the design temperature is 250 °F. The boiler design and construction shall be in accordance with the latest edition of the
ASME Code, Section IV, for heating boilers requirements.
3. Each Packaged boiler shall meet the local codes and ordinances, including the
Canadian Registration Number (CRN) for the Province of operation.
4. Each unit shall be furnished as a packaged steam boiler, consisting of boiler, burner, forced draft fan, controls, and accessories. Each unit shall be furnished with required wiring and piping, and factory assembled on a structural steel base as a self-contained unit. The burner and boiler package must meet CSA requirements for field approval.
B. BOILER DESIGN
1. Boiler shall be of the flexible water tube type with one lower drum and one upper drum.
2. Tubes patterns must ensure a perfectly balanced heat distribution across the boiler to produce an even flow of water.
3. Top, bottom and sides of furnace shall be water cooled. Use of water cooled front and/or rear wall shall not be permitted.
4. The fireside of the boiler shall have five (5) longitudinal gas passes to improve the efficiency of the unit. Each passes will be separated with water wall tubes to ensure maximum linear gas travel.
5. Flue gas passes shall be free of any baffles. The boiler shall have an in-line tube arrangement. For ease of service, staggered arrangement is not acceptable.
6. All tubes shall be exposed to radiant luminous heat in the boiler furnace which creates high water flow rates at all loads and substantially increases heat transfer in the convection zones outside the furnace.
7. All boiler tubes shall be attached to the drums by means of ferrules to be easily removable and replaceable with standard tools without requiring expanding or welding at the attachment to the drums. Boiler tubes welded to drums or headers are not acceptable.
Specificat ions for Novatherm’s eVoFlex
Packaged Watertube Hot Water Boiler Page 1 of 6

8. The boiler drums shall be furnished with handholes to facilitate boiler inspection and cleaning.
9. Boiler shall not have a rear or front down comer in order to prevent any flow bypassing the heat exchanger.
10. Boiler shall have a vent connection at the highest point on the upper drum.
11. The boiler end walls shall be constructed with 2,100ºF alumina-silica fibreboard insulation and 2,600ºF high temperature castable refractory, and shall be capable of running immediately upon cold start-up on high fire without sustaining any permanent damage.
12. The boiler inner casing shall be fabricated of 11 gauge steel and 2" thick 1,900ºF insulation. The casing shall be constructed with bolts and gaskets to ensure that the products of combustion are contained within the boiler and the boiler is easily serviceable.
13. The boiler outer casing shall consist of 24 gauge panels. The outer steel casing shall be removable sections painted as an available option. There shall be a 2" air space between the inner and outer casings.
14. The boiler shall have a 12 inch x 16 inch furnace access refractory lined door at the back of the boiler with hinges for ease of use. Two (2) observation ports shall be provided. A front flame observation port shall be provided at the burner enclosure and a furnace observation port shall be provided on the rear back door.
15. The entire inner casing shall be easily removed and replaced for inspection and maintenance, with standard tools without requiring welding.
16. Tube removal and replacement shall be readily accomplished from both sides of the boiler.
17. Round flanged smoke outlet to be located at top of boiler with top outlet position.
No loads shall be applied on the stack outlet. The use of a self supported stack shall be required.
18. Lifting lugs, attached to the boiler base, shall be provided to facilitate installation.
19. All boiler parts must be easy to procure in order to facilitate the maintenance of the boiler. Use of proprietary parts shall not be allowed
C. BOILER TRIM
1. Safety valves, size, and quantity, shall be in strict accordance with ASME Code requirements.
2. Low water cut off, of probe type, shall be mounted in the upper drum. It is to be wired to the burner control circuit to prevent burner operation if the boiler water falls below a safe level.
3. A pressure gauge and a water temperature indicator shall be installed on the boiler.
Specificat ions for Novatherm’s eVoFlex
Packaged Watertube Hot Water Boiler Page 2 of 6

D. BURNER EQUIPMENT
1. Each boiler shall be supplied with a complete burner firing natural gas and/or no.2 light oil. Burner shall be mounted, piped and wired to the boiler in factory as a packaged unit. Burner shall be a PowerFlame.
2. The gas burner shall burn the specified quantity of fuel without objectionable vibration, noise, or pulsation, with not more than 15% excess air and less than
100 ppm (corrected to 3% O
2
) CO in the products of combustion. In addition, when firing gas, the burner shall be guaranteed to produce less than __ ppm
(corrected to 3% O
2
) NOx emissions.
3. The light oil burner shall burn the specified quantity of fuel without objectionable vibration, noise, or pulsation, with not more than 15% excess air and a maximum of No. 1 smoke spot, as measured on the Bacharach Scale.
4. Each burner shall guarantee to meet the emissions regulations. The use of flue gas recirculation (FGR) is allowed to meet these regulations.
5. The burner is capable to operate automatically under Full Modulation and proven low fire start. The burner modulation should be a minimum of 4:1 turndown on
Natural Gas.
6. Flame safeguard system shall be Honeywell RM 7800 Series installed and wired at factory in a Nema-1A control cabinet.
7. The control cabinet shall include the blower motor starter and overload relay along with numbered terminal blocks and colour coded wires
8. The control cabinet shall have mounted on panel the pilot lights for Power on, fuel on and call for heat. A manual-auto firing rate selector switch shall be also mounted on panel.
9. The burner shall include a manual firing potentiometer, to operate the boiler on manual firing on cold start up.
10. The burner shall be equipped with an integral forced draft fan of the centrifugal type, with a direct-connected ODP motor. Air flow shall be controlled by mean of an air inlet damper. A minimum air flow switch shall be mounted on the fan housing.
11. The burner shall be equipped with gas-electric ignition. The ignition system shall be factory-mounted and consists of gas pilot, ignition transformer, pilot gas regulator and pilot gas solenoid valve and pilot gas shutoff cock.
12. Burner air to fuel control mix can be furnished with either a linkage system or optional linkage less system.
13. The boiler fuel train to include a gas regulator to accept a gas pressure of 5 psig at the inlet of the regulator.
14. Main gas train, complete with one motorized gas valve, and, if required, one main gas solenoid valve, gas metering valve, gas pressure regulator, two
Specificat ions for Novatherm’s eVoFlex
Packaged Watertube Hot Water Boiler Page 3 of 6

lubricated gas cocks, high and low gas pressure interlocks, and proof-of-closure switch.
15. Burner shall be equipped with a UV type flame scanner.
16. The oil burner shall be of the mechanical pressure atomizing type.
17. A two-stage oil pump shall be provided for each burner as an integral part of the burner.
18. Two approved automatically operated safety shutoff valves shall be provided in the oil supply line to the burner valves to be piped in series but wired parallel.
19. One oil pressure gauge is provided to indicate the discharge oil pump pressure.
E. CONTROLS
1. Each unit shall be equipped with necessary controls and safety devices to operate automatically. The combustion safety control shall be of the electronic type with timed programming sequences, and with safety lockout control in the event of a flame failure. Safety lockout shall require manual reset before automatic recycling can continue.
2. The burner control cabinet shall be mounted on the equipment supplied with a key lock, and shall contain the necessary fuses, motor contactor and circuit transformer. The control cabinet shall also contain the electronic flame safeguard and programmer, control circuit switch, necessary switching relays and indicating lights, all wired to a numbered terminal strip.
3. All electrical equipment, wiring devices and operating sequences shall meet CSA requirements.
4. Power supply: ______ volts, 3 phases, 60 Hertz. Control voltage: 110 volts, 1 phase, 60 Hertz.
5. Temperature controls, for regulation of burner operation, shall be mounted on the boiler and the temperature sensing element shall be located adjacent to the boiler outlet.
6. The full modulation of the burner shall be controlled by water temperature by means of a temperature control.
7. An additional high limit safety temperature control of the manual reset type shall be provided to control the burner.
F. TESTS
1. Boiler inspection shall include hydrostatic test in the presence of an Authorized
Inspector. He shall certify a data report which shall be delivered with the boiler as evidence of ASME compliance. The boilers shall bear a registration number.
2. A factory electrical panel test shall be performed. An operational check shall be evidenced on adjustment of controls and check of all safety devices.
Specificat ions for Novatherm’s eVoFlex
Packaged Watertube Hot Water Boiler Page 4 of 6

G. EFFICIENCY
1. Each packaged boiler shall be adjusted on site to operate at a maximum efficiency at all firing rates.
2. Predicted performances shall be provided by the manufacturer at the proposal stage. Manufacturer must guarantee to meet or exceed the predicated performances at 100% MCR or shall pay the owner 1% of the equipment acquisition cost for each efficiency percentage bellow the predicted efficiency.
For the performances calculations, manufacturer must use the following information:

Elevation : _____ ft above sea level

Fuel type and high heating value : _______ BTU/lb

Boiler output capacity at 100% MCR : _________ MMBtu/hr

Operating pressure : ________ psig

Water outlet temperature ____ F

Water inlet temperature _____ F

Excess air : _____ %

FGR : _____ %
3. The flue gas exit temperatures shall not fall below the dew point of the flue gases to prevent condensation corrosion within the boiler.
H. WARRANTIES
1. Each packaged boiler shall be warranted against defects in workmanship and material for a period of eighteen (18) months from date of shipment (or offer to ship), or twelve (12) months from date of start-up, whichever occurs first.
2. The boiler pressure vessel shall be warranted against thermal stress cracking for a period of twenty (20) years from date of shipment providing the boiler is operated and maintained in accordance with the conditions specified in the
Owner's Manual. This warranty shall cover in full all leaks in headers and down comers caused by any conditions other than corrosion, FOB manufacturer.
I. START-UP AND SERVICE
1. Start-up and service of each packaged boiler shall be provided by experienced and trained technicians or by regional authorized representative.
2. Provision shall be made for the start-up of each packaged boiler, as well as instruction to owner's personnel concerning operation and maintenance.
3. The customer is to provide a chemical boil out compound to remove oil residue at time of commissioning of the boiler.
4. The start-up and commissioning of the boilers will require a minimum of 8 – 10 hours to fully cure the refractory. The refractory curing procedure must follow the manufacture procedure shown in the manufacturer manual.
Specificat ions for Novatherm’s eVoFlex
Packaged Watertube Hot Water Boiler Page 5 of 6

5. Start-up reports, produced by the start-up technician, using the start-up form found in the operating and maintenance manual shall be sent back to the manufacturer for approval and warranty activation.
Specificat ions for Novatherm’s eVoFlex
Packaged Watertube Hot Water Boiler Page 6 of 6