Buffalo Wild Wings
Buffalo Wild Wings
Buffalo Wild Wings
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C. Direct Fired Make-Up Air Unit (MUA or SF-1) Accurex<br />
1. Install direct fired make-up air heaters as scheduled. Units shall be ETL or UL<br />
listed.<br />
2. Units shall be factory assembled and shipped as a complete packaged assembly<br />
and shall include the following:<br />
a. Gas Burner designed to operate with an air velocity of 2,850 FPM across<br />
non-clogging stainless steel air baffles. Burner to be designed to operate<br />
at 100% thermal efficiency throughout the life of the equipment.<br />
Turndown of the burner shall be a minimum of 25:1. Entire width of<br />
burner burns at all times. Burner section shall have adjustable profile<br />
plates for field adjustment of air velocity over the burner. Provide<br />
intermittent ignition assembly.<br />
b. Forward curved, double width, double inlet blower mounted on a solid<br />
steel shaft with self aligning 100,000 hour bearings.<br />
c. Equipment casing to be 16 gauge, G90 galvanized steel around an<br />
integral support frame of structural angle. All panels shall be removable<br />
for easy access. Provide an observation port for the main and pilot<br />
flames. All controls, gas valves and modulating controls shall be<br />
mounted in a vestibule with access doors outside of the air stream.<br />
d. Gas train shall be constructed to meet State Codes, ANSI and IRI<br />
requirements. Gas train shall be selected to operate at 14” W.C. psig<br />
pressure. Regulators to be approved for non-vented service.<br />
e. Temperature controller shall be a ductstat mounted integral to the unit.<br />
f. Provide the following controls:<br />
(1) Airflow switch<br />
(2) Electronic Flame Safety Relay<br />
(3) High Temperature Limit Switch<br />
(4) Starter Interlock<br />
(5) High Gas Pressure Switch<br />
(6) Low Gas Pressure Switch<br />
(7) Adjustable Low Limit<br />
(8) Auxiliary Circuit to shut the unit down on a flame failure<br />
(9) Adjustable burner on/off economizer intake air ductstat<br />
(10) Remote panel complete with operating lights to indicate blower<br />
on and burner on, and discharge air temperature adjustment,<br />
summer-off-winter selector switch.<br />
(11) Audible alarm to signal safety shut-down<br />
(12) Shunt trip circuit breaker in source electrical panel<br />
g. Provide motorized outside air damper that complies with the damper<br />
specification in Section 15800.<br />
h. Unit shall have single point power connection with a fused disconnect.<br />
Provide filter section with cleanable aluminum filter.<br />
10/28/2011 HEATING, VENTILATING AND AIR CONDITIONING<br />
15700-3