11
Step 6 — Condensate Drain
HORIZONTAL UNITS (50HQL) — Slope the unit toward
the drain at a
1
/
4
in. per foot pitch. See Fig. 5. If it is not possi-
ble to meet the required pitch, a condensate pump should be
installed at the unit to pump condensate to building drain.
Horizontal units are not internally trapped, therefore an ex-
ternal trap is necessary. Each unit must be installed with its
own individual trap and means to flush or blowout the conden-
sate drain line. Do not install units with a common trap or vent.
For typical condensate connections see Fig. 6.
NOTE: Never use a pipe size smaller than the connection.
VERTICAL UNITS (50VQL) — Each unit must be installed
with its own individual trap, vent and means to flush or blow-
out the condensate drain line. Do not install units with a com-
mon trap or vent. See Fig. 6.
Consider the following:
• Units are typically installed directly above each other on
successive floors with condensate drains located near the
units.
• Connect the unit condensate drain connection to the
building condensate drain with a 1-in. drain line.
• The horizontal run of a condensate hose is usually too
short to cause drainage problems, however pitch the hor-
izontal run of the condensate line should be at least
1 inch for every 10 feet of run in the direction of flow.
Avoid low points and unpitched piping since dirt collects
in low or level areas and may cause stoppage and
overflow.
• Install a condensate trap at each unit with the top of
the trap positioned below the unit condensate drain
connection.
• Design the length of the trap (water-seal) based upon the
amount of positive or negative pressure on the drain pan.
As a rule, 1-in. of trap is required for each inch of nega-
tive pressure on the unit.
VENTING — A vent should be installed in the condensate
line of any application which may allow dirt or air to collect in
the line. Consider the following:
• Always install a vent where an application requires a
long horizontal run.
• Always install a vent where large units are working
against higher external static pressure and to allow
proper drainage for multiple units connected to the same
condensate main.
• Be sure to support the line where anticipated sagging
from the condensate or when “double trapping” may
occur.
• If condensate pump is present on unit, be sure drain con-
nections have a check valve to prevent back flow of con-
densate into other units.
1/4” Pitch for
Drainage
Pitch Toward
Drain
Drain Connection
Fig. 5 — Horizontal Unit Pitch
NOTE: Trap should be deep enough to offset maximum unit static
difference.
Fig. 6 — Trap Condensate Drain
Summary of Contents for AQUAZONE VQL
Page 15: ...15 AQUAZONE THERMOSTAT Fig 8A 50HQL072 120 and 50VQL160 With Complete C Controls Typical ...
Page 16: ...16 AQUAZONE THERMOSTAT Fig 8B 50HQL072 120 and 50VQL160 with Deluxe D Controls Typical ...
Page 17: ...17 AQUAZONE THERMOSTAT Fig 9A 50VQL080 120 with Complete C Controls Typical ...
Page 18: ...18 AQUAZONE THERMOSTAT Fig 9B 50VQL080 120 with Deluxe D Controls Typical ...
Page 19: ...19 AQUAZONE THERMOSTAT Fig 10A 50VQL200 300 with Complete C Controls Typical ...
Page 20: ...20 AQUAZONE THERMOSTAT Fig 10B 50VQL200 300 with Deluxe D Controls Typical ...
