8
LIQUID PRESSURE
PSIG R-22 R-410A
200 101 70
210 105 73
220 108 76
225 110 78
235 113 80
245 116 83
255 119 85
265 121 88
275 124 90
285 127 92
295 130 95
305 133 97
325 137 101
355 144 108
375 148 112
405 155 118
415 157 119
425 n/a 121
435 n/a 123
445 n/a 125
475 n/a 130
500 n/a 134
525 n/a 138
550 n/a 142
575 n/a 145
600 n/a 149
625 n/a 152
SATURATED LIQUID PRESSURE
TEMPERATURE CHART
SATURATED LIQUID
TEMPERATURE ºF
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 finished
space, it may be necessary to insulate the condensate drain
line located inside the building. Use Armaflex
®
or similar
material.
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 re-
quired support to the drain line to prevent bowing. If the second-
ary drain line is required, run the line separately from the pri-
mary 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 a fin-
ished living space to prevent sweating. Install a condensate trap
to ensure proper drainage.
NOTE: When units are installed above ceilings, or in other
locations where damage from condensate overflow may
occur, it is MANDATORY to install a field 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 applications may
require a deeper field constructed “P” style trap than is shown in
Figure 12 to allow proper drainage and prevent condensate over-
flow.
Air Handler
3" MIN.
POSITIVE LIQUID
SEAL REQUIRED
AT TRAP
Drain
Connection
2" MIN.
Figure 12
NOTE: Trapped lines are required by many local codes. In the
absence of any prevailing local codes, please refer to the require-
ments 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 air-
stream during blower operation.
Use of a condensate removal pump is permitted when necessary.
This condensate pump should have provisions for shutting off the
control voltage should a blocked drain occur. A trap must be
installed between the unit and the condensate pump.
IMPORTANT NOTE: The evaporator coil is fabricated with oils
that may dissolve styrofoam and certain types of plastics.
Therefore, a removal pump or float switch must not contain any of
these materials.
Tip: Priming the “P” trap may avoid improper draining at the ini-
tial installation and at the beginning of the cooling season.
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