SPECIFICATIONS

Fort Nelson NRRM REFRIGERATION SECTION 15650
Airport Terminal Building Page: 1
Washroom Renovations
15665 ROOF TOP HEATING & COOLING UNITS - GAS HEATING
1. Units shall be Lennox LG Series R-410A High Efficiency models with capacities as scheduled
incorporating direct expansion cooling and gas heating, with accessories as specified herein.
The equipment shall be CSA/CGA approved and shipped pre-charged, piped and wired
internally ready for field connections. Unit shall be complete with PVC coated condenser coil
guards, condensate drain trap, economizer section with modulating damper motor, outdoor air
and return air dampers, and pressure relief damper. Provide roof curbs, allowing weatherproof
duct connection and entry into conditioned area.
2. Heat exchanger shall be constructed of aluminized steel with a limited 10 year warranty. Inshot
burners shall be individually removable for servicing. Gas controls to have intermittent spark
ignition, electronic flame safety, automatic single stage gas valve, manual shut off, pressure
regulator, induced draft fan, air proving switch, and manual reset flame roll out switch and fan
limit switches and to protect heating system from abnormal operating temperatures. Unit shall
have -60º F kit for cold temperature location. Unit shall have vertical vent extension kit, with
B-vent and associated vent fittings provided by contractor per the kit instructions.
3. Refrigeration circuit shall be factory sealed with full operating charges of oil and R-410A
refrigerant and shall be complete with liquid line strainer, suction and liquid line service gauge
ports, manual reset high pressure switch, low pressure switch, drier, freezestat and thermostatic
expansion valve. Controls shall include dual pressure switch, compressor relay and overload
protection. Hermetic, scroll type compressor shall have a limited warranty for five years,
suction cooled and equipped with suction and liquid line valves, overload protection and
effective slugging protection. Compressor shall be equipped with crankcase heaters. The entire
running gear shall be spring mounted within the sealed unit and the entire compressor shall be
mounted on rubber vibration isolators. Unit shall be capable of low ambient operation down to
0°F (-18°C) and have 2 stages of cooling.
4. Condenser fan shall be an axial flow variable speed ECM motor type, with overload protection,
and permanently lubricated bearings. Supply air fan shall be direct drive, forward curved,
centrifugal type, high efficiency variable speed ECM motor. Condenser and evaporator coils
shall be aluminum fin on copper tube.
5. Cabinet shall be hot dipped galvanized steel with baked on enamel finish with hinged access
doors and fibreglass insulation. All panels shall have seals and quarter turn latching handles to
provide a tight air and water seal.
6. Provide disposable 50mm (2") thick type pleated MERV 7 filters with the unit.
7. The unit shall be complete with a factory wired solid state microprocessor based control board
with a limited warranty of three years, Prodigy Control System, consisting of standard operating
and safety controls for the heating and mechanical cooling control systems as well as a terminal
strip suitable for connection of low voltage controls. The Prodigy unit controller shall display
temperature readings from return air, supply air and outside air sensors that are furnished as
standard equipment. The Prodigy unit controller shall display detailed diagnostic information
February 2012 JM BEAN & CO. LTD 1130.10