Thermal Solutions EVS series gas regulated boilers

Thermal Solutions EVS series gas regulated boilers

Product basic information

1. Core identification and certification

Product positioning: Gas driven modular regulating boiler (GAS-FIRED MODULATION BOILER), used for hot water systems, certified by AHRI, in compliance with the National Gas Code (NFPA 54/ANSI Z223.1) in the United States, the Gas Installation Code (CAN/CSA B149) in Canada, and local regulations such as Massachusetts 248 CMR 4.00/5.00.

Key information: Released in September 2024, replacing the old version, including bilingual warning content in English/French, to be posted and kept clear and readable. Boiler model and serial number (see rated label) must be provided during maintenance.

2. Model and core parameters

Covering 8 models (EVS-500 to EVS-3000), the core parameter differences are as follows (taking typical models as an example):

Model Input Power (MBH) Total Output (MBH) Net AHRI Rated (MBH) Water Capacity (gallon) Dry Weight (pound) Wet Weight (pound) Power Supply/Fan Power

EVS-500 500 431 375 6.1 722 823 120V/189 horsepower

EVS-1000 1000 850 739 16.4 1185 1322 120V/1.5 horsepower

EVS-2000S 2000 1732 1506 40.1 1835 2169 120V/1.5 horsepower

EVS-3000 3000 2610 2270 43.1 2193 2552 208V/2 horsepower

General restrictions: Maximum working pressure of 160 PSI, medium temperature -40~+90 ° C, ambient temperature -40~+85 ° C, condensate pH value 3-5 (requires neutralization treatment).

Installation specifications (key requirements)

1. Pre requirements

Installation qualification: It is required to be operated by a certified Plumber/Gas Fitter (mandatory in Massachusetts). Before installation, local regulations must be confirmed to ensure a safe distance from combustible materials (6 inches left/right/back, 24 inches front, 18 inches for flue connections, and 24-36 inches for maintenance spacing depending on the model).

Space and ventilation: Determine whether a "non confined space" (≥ 50 ft ³/1000 Btu/h) or a "confined space" based on the space volume and total gas input. A confined space requires two permanent ventilation openings (within 12 inches at the top and 12 inches at the bottom, with a minimum diameter of 3 inches); Sealed combustion engine models can be exempted from indoor ventilation, but the intake pipe needs to be installed according to regulations.

2. Core system installation

(1) Ventilation system

Type: Supports positive pressure ventilation (side wall/vertical, maximum equivalent length of 50 feet, non confluent) and negative pressure ventilation (traditional chimney, requiring a vertical height of 15 feet or more and double acting air pressure dampers), ventilation ducts require AL29-4C ®  Wait for condensation resistant materials, tilt the horizontal section at least 1 inch every 4 feet, and keep the terminal away from doors and windows (below 4 feet/horizontal 4 feet/above 1 foot) and gas meters (4 feet).

Special requirements: Massachusetts sidewall ventilation requires the installation of carbon monoxide detectors with backup batteries (1 per floor) and 8-foot high signage ("GAS VENT DirectLY BELOW. KEEP CLEAR").

(2) Water system

Water quality requirements: hardness ≤ 8.5 grains (150 ppm), pH 8.8-9.2, requiring professional water treatment (anti oxidation, scaling), ethylene glycol usage not exceeding 50%, and rust inhibitor needs to be added; The new pipe needs to be cleaned with trisodium phosphate (TSP), and the old system needs to be equipped with a filter at the return water end.

Pipeline specifications: The supply/return water diameter should be 2-4 inches (depending on the model), and the flow rate should comply with Table 2 (such as EVS-500 minimum 22 gpm, maximum 43 gpm). The return water temperature should not be lower than 130 ° F (anti condensation), and the temperature difference should not exceed 40 ° F (anti heat exchanger damage); Safety valves (not shut-off valves), exhaust devices, and expansion tanks need to be installed.

(3) Gas system

Pressure requirements: The minimum inlet pressure for natural gas is 4-9 inches of water column (depending on the model), for propane it is 8 inches of water column, and for maximum pressure it is 14 inches of water column. For overpressure, an additional pressure regulator must be installed (no multiple boilers can share one); Gas pipes need to undergo leak testing (using soapy water, no open flames), and install sediment traps and manual shut-off valves.

Pipe diameter selection: Refer to Table 4 (such as the equivalent length of 10 feet for a 1-inch SCH40 pipe with a capacity of 514 ft ³/h), and consider the equivalent length of the pipe fittings (Table 6, such as the equivalent length of 1.55-20.2 feet for a 90 ° elbow).

(4) Electrical system

Power supply: requires independent circuit and fuse switch, voltage 120/208/230/460V (depending on model), grounding in accordance with NFPA 70; Do not connect the boiler and circulating pump to the same fuse switch. Isolation relays are required for low voltage control (24V), and short circuiting of safety controls is prohibited.

Operation and debugging process

1. Check before startup

Confirm that the installation of ventilation, water, gas, and electrical systems is compliant, turn off all power sources and gas valves, empty the air in the gas pipeline (wait for 5 minutes), check for no gas leaks, and then open the gas valve.