Raypak HD401 2.2BOILERS A. General, The boilers shall be fired with, gas at a rated input of

2. Product: Hi Delta SS™ copper finned-tube hydronic boiler(s)

2.2BOILERS A. General

1. The boiler(s) shall be fired with gas at a rated input of BTU/hr.

2.The boiler(s) shall be CSA tested and certified with a minimum thermal efficiency of 84 percent at full fire.

3.The boiler(s) shall be ASME inspected and stamped and National Board registered for 160 PSIG working pressure, complete with a Manufacturer's Data Report.

4.The boiler(s) shall have a floor loading of 45 lbs. /square foot or less.

B.Heat Exchanger

1.The heat exchanger shall be of a single-bank, horizontal-grid design with nine integral copper fin tubes, each end of which is rolled into an ASME boiler-quality steel tube sheet.

2.The heat exchanger shall be sealed to 160 PSIG rated cast iron headers with high temperature silicone "O" ring gaskets.

3.The low water volume heat exchanger shall be explosion-proof on the water side and shall carry a twenty-year warranty against thermal shock.

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 boiler(s) shall be capable of operating at inlet water temperatures as low as 105°F without condensation.

C.Burners

1.The tubular burners shall have gas orifices, punched ports and slots, be capable of quiet ignition and extinction without flashback at the orifice, and be manufactured from corrosion- resistant, stainless steel with low expansion coefficient.

2.The burners will be supplied with a fan-assisted, clean burning, and highly efficient fuel-air mixture.

D.Pilot Control System

1.The boiler(s) shall be equipped with a 100 percent safety shutdown system.

2.The ignition shall be Hot Surface Ignition type with full flame rectification by remote sensing separate from the ignition source, with a three try-for-ignition sequence, to ensure consistent operation.

3.The igniter will be located away from the water inlet to protect the device from condensation during startup.

4.An external viewing port shall be provided, permitting visual observation of burner operation.

E.Gas Train

1.The boiler(s) shall have dual-seated main gas valve(s).

2.Gas control trains shall have a redundant safety shut-off feature, main gas regulator, and plugged pressure tapping to meet the requirements of ANSI Z21.13/CSA 4.9.

F.Boiler Control

1.The following safety controls shall be provided:

a.High limit control

b.Flow switch

c.PSIG ASME pressure relief valve, piped by the installer to an approved drain

d.Temperature and pressure gauge

2.The boiler(s) shall be equipped with an energy-saving pump control relay (Economaster), mounted and wired, which automatically shuts off the boiler pump at a set period after boiler shut-down (adjustable for two settings of five or ten minutes) to avoid standby losses associated with constant pump operation.

G.Firing Mode

1.For models HD101 – HD401, provide two-stage fire control of the gas input to the boiler (on/off fire optional).

H.Boiler Diagnostics

Project Name / Date Division 23 52 33.13 - 2