GOC325570 MAH-GC - Contractor - Replace 6 Packaged HVAC units

GENERAL CONTRACTOR
4 Packaged Rooftop Units:
Schedule the shutdown of each unit with site personnel prior to beginning work. Work shall be performed
during weekend hours; unit(s) shall be operational during business hours.
Engage the services of a qualified electrician to disconnect and perform megger testing on existing
conductors to unit(s). Report pass/fail megger test results to owner/engineer before proceeding.
Schedule craning with site personnel for lifts on owner’s property, and the City of Kitchener for lifts on city
property; arrange and pay for street closures (if required). Property damage (i.e. landscaping, concrete,
etc.) shall be repaired at the contractor’s cost.
Pump down and dispose of refrigerant per BGIS/PWGSC requirement prior to removal/demolition.
Provide proof of disposal and include with closeout documentation.
Disconnect ductwork, natural gas, power and controls connections - to be reconnected to new unit(s).
Remove and dispose of existing unit(s).
RTU2 and RTU4 only - remove and dispose of existing roof curb(s); provide new roof curb and structural
steel. Install structural steel and roof curb over existing roof opening and engage the services of a
qualified roofer to roof/flash new roof curb/structural steel to make water tight.
Place new unit(s) on roof curb. Provide new transition duct for connection to existing ductwork.
Reconnect existing natural gas, power and controls.
Replace existing wood natural gas supports with new prefabricated type.
Engage the services of the site controls specialist (Delta) to verify operation of new unit(s).
2 Split Air Handling Units:
Schedule shutdown of the basement AHU with site personnel prior to beginning work.
Pump down and dispose of refrigerant per BGIS/PWGSC requirement prior to removal/demolition.
Schedule craning with site personnel for lifts on owner’s property. Property damage (i.e. landscaping,
concrete, etc.) shall be repaired at the contractor’s cost.
Replace two existing Roof mounted condensing unit(s) with new, in the same location(s); provide new
prefabricated support pads.
Engage the services of a qualified electrician to disconnect and reconnect existing electrical and control
connections.
Remove and install new refrigerant lines, from Basement Compressor Room, to Roof mounted
condensing units.
Remove and dispose of existing air handling unit(s), refrigerant lines, combustion/vent and ductwork in
Basement Compressor Room as required for connection to new ductwork.
Disconnect natural gas, power and controls connections - to be reconnected to new unit(s).
Provide new twinned gas furnaces horizontally on prefabricated steel angle frame per manufacturer’s
recommendations. Provide new ductwork and accessories (turning vanes, control dampers, etc.) to
connect to existing ductwork entering/exiting room.
Reconnect existing natural gas, power and controls. Provide new refrigerant, combustion air, vent and
condensate connections.
Engage the services of the site controls specialist (Delta) to verify operation of new unit(s)