Unit Piping - Daikin RoofPak RPS Series Installation And Maintenance Manual

Refrigeration Service Valves
The unit is shipped with all refrigeration service valves closed.
RDT, RPS and RCS units have the following:
Sizes 15 to 105—One discharge valve is provided per
refrigerant circuit, located between the compressors and
condenser.
Sizes 115 to 135—One service valve is provided on the
discharge and suction of each compressor.
All Units—One liquid valve is provided per refrigeration
circuit, located at end of condensing section opposite
condenser control box.
RFS units do not ship with service valves installed. Before
attempting to start the compressors, all refrigeration service
valves should be fully opened and backseated.

Unit Piping

Condensate Drain Connection
Drain pans must be cleaned periodically. Material in uncleaned
drain pans can cause disease. Cleaning should be performed
by qualified personnel
• The unit is provided with a 1.5" male NPT condensate
drain connection. Refer to certified drawings for the exact
location. For proper drainage, level the unit and drain pan
side to side and install a P-trap
• RPS units may have positive or negative pressure
sections. Use traps in both cases with extra care given to
negative pressure sections. In
should be a minimum of 8" (203 mm). As a conservative
measure to prevent the cabinet static pressure from
blowing or drawing the water out of the trap and causing
air leakage, dimension A should be two times the
maximum static pressure encountered in the coil section
in inches wc.
• Draining condensate directly onto the roof may be
acceptable; refer to local codes. Provide a small drip
pad of stone, mortar, wood, or metal to protect the roof
against possible damage.
• If condensate is piped into the building drainage system,
pitch the drain line away from the unit a minimum of 1/8"
per foot. The drain line must penetrate the roof external to
the unit. Refer to local codes for additional requirements.
Sealed drain lines require venting to provide proper
condensate flow.
IM 926-3 • ROOFPAK APPLIED SYSTEMS
WARNING
Figure 56, dimension "A"
• Where the cooling coils have intermediate condensate
pans on the face of the evaporator coil, copper tubes
near both ends of the coil provide drainage to the main
drain pan. Check that the copper tubes are in place and
open before the unit is put into operation.
• On units with staggered cooling coils, the upper drain pan
drains into the lower coil drain pan through a copper tube
near the center of the drain pan. Check that this tube is
open before putting the unit into operation and as a part
of routine maintenance.
• Because drain pans in any air conditioning unit have
some moisture in them, algae, etc. will grow. Periodically
clean to prevent this buildup from plugging the drain
and causing the drain pan to overflow. Clean drain pans
to prevent the spread of disease. Cleaning should be
performed by qualified personnel.
Figure 56: Condensate Drain Connection
Gas Piping
See the "Installation" section of the gas-fired furnace
installation manual, Bulletin No. IM 684 or 685.
42
Mechanical Installation
www.DaikinApplied.com