1. The water heater(s) shall be fired with |
| gas at a rated input of |
| BTU/hr. |
2.The water heater(s) shall be CSA tested and certified with a minimum thermal efficiency of 82 percent at full fire.
3.The water heater(s) shall be ASME inspected and
4.The water heater(s) shall have a floor loading of 70 lbs. /square foot or less.
B.Heat Exchanger
1.The heat exchanger shall be of a
2.The heat exchanger shall be sealed to 160 PSIG rated bronze headers with silicone "O" rings, having a temperature rating over 500°F.
3.The low water volume heat exchanger shall be
4.The headers shall be secured to the tube sheet by stud bolts with flange nuts to permit inspection and maintenance without removal of external piping connections.
5.The heat exchanger shall incorporate “V” baffles, between the tubes, to ensure complete contact of the external tube surfaces with the products of combustion.
6.The water heater(s) shall be capable of operating at inlet water temperatures as low as 105°F without condensation.
7.The water heater(s) shall be designed to accommodate field changes of either left or right hand plumbing and electrical while leaving the tube bundle in place.
C.Burners
1.The stainless steel alloy burners shall be of the raised port design with primary fixed air ports, capable of quiet extinction without flashback at the orifice at firing rates between 20% and 100%, and mounted in a slide out burner drawer for ease of inspection.
D.Pilot Control System
1.The water heater(s) shall be equipped with a 100 percent safety shutdown system. The standard pilot ignition shall be:
a.Models
b.Models
2.The ignition shall be Spark Ignition type with full flame rectification to ensure consistent operation.
3.The igniter will be located away from the water inlet to protect the device from condensation during startup.
4.The ignition control module shall include two LEDs that indicate flame presence and/or system status.
E.Gas Train
1.The water heater(s) shall have dual gas valve seats per ANSI Z21.10.3/CSA 4.3.
2.Gas control trains shall have a redundant safety
F.Water Heater Control
1.The following safety controls shall be provided:
a.High limit control
b.Flow switch, mounted and wired
c.PSIG ASME pressure relief valve, piped by the installer to an approved drain
d.Temperature and pressure gauge
2.The water heater(s) shall be equipped with an
G.Firing Mode
Project Name / Date | Division 23 52 33.13 - 2 |