AMST Installation Manual
10
LIQUID PRESSURE
SATURATED LIQUID
TEMPERATURE °F
PSIG R-410A
200 70
210 73
220 76
225 78
235 80
245 83
255 85
265 88
275 90
285 92
295 95
305 97
325 101
355 108
375 112
405 118
415 119
425 121
435 123
445 125
475 130
500 134
525 138
550 142
575 145
600 149
625 152
SATURATED LIQUID PRESSURE
TEMPERATURE CHART
8 Condensate Drain Lines
The coil drain pan has a primary and a secondary drain
with 3/4” NPT female connections. The connectors required
are 3/4” NPT male, either PVC or metal pipe, and should
be hand tightened to a torque of no more than 37 in-lbs. to
prevent damage to the drain pan connection. An insertion
depth of approximately 3/8” to 1/2” (3-5 turns) should be
expected at this torque.
1. Ensure drain pan hole is not obstructed.
2. To prevent potential sweating and dripping on to
condensate drain line located inside the building. Use
A secondary condensate drain connection has been
provided for areas where the building codes require it.
Pitch all drain lines a minimum of 1/4” per foot to provide
free drainage. Provide required support to the drain line to
prevent bowing.
If the secondary drain line is required, run the line
separately from the primary drain and end it where
condensate discharge can be easily seen.
NOTE: Water coming from secondary line means the
coil primary drain is plugged and needs immediate
attention.
CAUTION
IF SECONDARY DRAIN IS NOT INSTALLED, THE SECONDARY
ACCESS MUST BE PLUGGED.
Insulate drain lines located inside the building or above
condensate trap to ensure proper drainage.
NOTE: When units are installed above ceilings, or
in other locations where damage from condensate
fabricated auxiliary drain pan under the coil cabinet
enclosure.
The installation must include a “P” style trap that is located
as close as is practical to the evaporator coil. See Figure
12 for details of a typical condensate line “P” trap.
NOTE: Units operating in high static pressure
“P” style trap than is shown in Figure 12 to allow
Air Handler
2.75" MI
N.
POSITIVE LIQUID
SEAL REQUIRED
AT TRAP
Drain
Connection
2" MIN.
NOTE: Trapped lines are required by many local
codes. In the absence of any prevailing local codes,
please refer to the requirements listed in the Uniform
Mechanical Building Code.
A drain trap in a draw-through application prevents air
from being drawn back through the drain line during fan
operation thus preventing condensate from draining, and
if connected to a sewer line to prevent sewer gases from
being drawn into the airstream during blower operation.
Use of a condensate removal pump is permitted when
necessary. This condensate pump should have provisions
occur. A trap must be installed between the unit and the
condensate pump.