Install Instructions
9
8 Condensate Drain Lines
The coil drain pan has a primary and a secondary drain wit h 3/ 4" NPT female connections. The connectors required are 3/ 4" NPT male,
either PVC or met al pipe, and should be hand tight ened to a torque of no more than 37 in-lbs. to prevent damage to the drain pan
connection. An insert ion dept h 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 potent ial sweat ing and dripping on to finished space, it may be necessary to insulat e the condensate drain line located
inside the building. Use Armaflex
®
or similar mat erial.
A secondary condensate drain connection has been provided for areas where the building codes require it. Pit ch 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 condensat e discharge can be easily seen.
NOTE: Water coming from secondary line means the coil primary drain is plugged and needs immediate attent ion.
Insulat e drain lines located inside the building or above a finished living space to prevent sweat ing. Inst all a condensat e trap to ensure
proper drainage.
NOTE: When units are inst alled above ceilings, or in ot her locations w here damage from condensat e overflow may occur, it is
M ANDATORY to inst all a field fabricated auxiliary drain pan under the coil cabinet enclosure.
The inst allat ion must include a “ P” style trap that is located as close
as is practical to the evaporat or coil. See Figure 12 for details of a
typical condensat e line “ P” trap.
NOTE: Trapped lines are required by many local codes. In the ab-
sence of any prevailing local codes, please refer to the requirements
listed in the
Uniform M echanical Building Code.
A drain trap in a draw-through application prevents air from being
draw n back through the drain line during fan operat ion thus prevent ing conden-
sat e from draining, and if connected to a sew er line to prevent sew er gases from
being drawn into the airstream during blower operation.
Field experience has shown condensat e drain traps wit h an open vertical Tee
bet ween the air handler and the condensate drain trap can improve condensat e
drainage in some applications, but may cause excessive air discharge out of the
open Tee. The manufacturer does not prohibit this type of drain but we also do
not recommend it due to the resulting air leakage. Regardless of the condensate
drain design used, it is t he installer’s responsibility to ensure the condensate drain
syst em is of sufficient design to ensure proper condensat e removal from the coil
drain pan.
Use of a condensate removal pump is permitted when necessary. This conden-
sat e pump should have provisions for shut t ing off the cont rol voltage should a
blocked drain occur. A trap must be inst alled bet w een the unit and the conden-
sat e pump.
IM PORTANT NOTE: The evaporator coil is fabricated wit h oils that may dissolve styrofoam and cert ain types of plast ics. Therefore, a
removal pump or float swit ch must not contain any of these mat erials.
Tip: Priming the “ P” trap may avoid improper draining at the initial inst allat ion and at the beginning of the cooling season.
9 Ductwork
This air handler is designed for a complete supply and ret urn ductwork syst em.
To ensure correct syst em performance, the ductwork is to be sized to accommodate 350-450 CFM per ton of cooling with the st at ic
pressure not to exceed 0.5" in w.c. Refer to ACCA M anual D, M anual S and M anual RS for information on duct sizing and application.
Flame retardant ductwork is t o be used and sealed to the unit in a manner that will prevent leakage.
NOTE: A dow nflow application wit h electric heat must have an L-shaped sheet metal supply duct without any outlet s or registers
located directly below the heater.
9.1 Return Ductwork
DO NOT LOCATE THE RETURN DUCTWORK IN AN AREA THAT
CAN INTRODUCE TOXIC, OR OBJECTIONABLE FUM ES/
ODORS INTO THE DUCTWORK. The ret urn duct w ork is to
be connected to the air handler bottom (upflow configura-
tion).
CAUTION
If secondary drain is not installed, the secondary
access must be plugged.
Air Handler
3" MIN.
POSITIVE LIQUID
SEAL REQUIRED
AT TRAP
Drain
Connection
2" MIN.
Figure 12
Do not operate this product without all the ductwork
attached.