substitution request - Alliance Construction Solutions

PART 3 - EXECUTION
3.1 EXAMINATION
A. Examine areas and conditions, with Installer present, for compliance with requirements for
installation tolerances and other conditions affecting performance of the Work.
B. Examine roughing-in for hot-water and chilled water piping systems to verify actual locations of
piping connections before equipment installation.
C. Examine walls, floors, and roofs for suitable conditions where dehumidification units will be
installed.
D. Proceed with installation only after unsatisfactory conditions have been corrected.
3.2 INSTALLATION
A. Equipment Mounting: Comply with requirements for vibration isolation devices specified in
Section 230548 "Vibration and Seismic Controls for HVAC Piping and Equipment."
1. Minimum Deflection: 1/4 inch (6 mm).
B. Install continuous-thread hanger rods and spring hangers with vertical-limit stop of size required
to support weight of dehumidification unit.
1. Comply with requirements for vibration isolation devices specified in Section 230548
"Vibration and Seismic Controls for HVAC Piping and Equipment." Fabricate brackets or
supports as required.
2. Comply with requirements for hangers and supports specified in Section 230529 "Hangers
and Supports for HVAC Piping and Equipment."
3.3 CONNECTIONS
A. Where piping is installed adjacent to dehumidification units, allow space for service and
maintenance of dehumidification units.
B. Connect piping to dehumidification units mounted on vibration isolators with flexible connectors.
C. Connect condensate drain pans using minimum NPS 1-1/4 (DN 32) copper tubing. Extend to
nearest equipment or floor drain. Construct deep trap at connection to drain pan, and install
cleanout at changes in direction.
D. Refrigerant Piping: Comply with requirements in Section 232300 "Refrigerant Piping." Connect to
supply and return coil tappings with shutoff valve and union or flange at each connection.
E. Hot-Water Piping: Comply with requirements in Section 232113 "Hydronic Piping." Connect to
supply coil tappings with shutoff valve, return coil tappings with balancing valve, and union or
flange at each connection.
F. Steam and Condensate Piping: Comply with requirements in Section 232213 "Steam and
Condensate Heating Piping." Connect with shutoff valve and union or flange.
Project No.: 10145
550 15 th Street Dual Brand Hotel
03/16/2012
23 8416 - 9 MECHANICAL DEHUMIDIFICATION
UNITS