Toshiba Carrier MMD-AP0180VHG2UL Installation, Operation And Maintenance Manual Download

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035-000051-001

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MMD IOM 1.2 11-10-2020

Ceiling  Suspension:  Mount  the  unit  in  ceiling-
suspended  horizontal  orientation  per  suspen-
sion details (Figure 4a).  Unit is NOT intended
to be wall mounted.  Consult a qualified struc-
tural  engineer for special  mounting considera-
tions.

Install  the  unit  so  that  it  pitches  slightly  –(1/8
inch)  –    toward  the  condensate  drain  connec-
tion.

Condensate Drain

Install a trapped condensate drain line at unit
drain connection. All MMD units have 3/4 in.
FPT condensate main and auxiliary drain

connections.
Provide adequate trap clearance (trap depth)
beneath the unit as indicated in Fig. 3.  Pro-
vide freeze-up protection as required to in-
sure reliable condensate drainage.  Freeze protec-
tion measures are customer-supplied and in-
stalled.

Pipe to condensate drain using PVC or copper or
other suitable material. Pitch drain piping down-
ward at a minimum slope of 1/8 inch per foot.

Pipe auxiliary drain  to “tell tale” drain location or
floor drain  to clearly indicate when condensate
drain service is required.  Alternately, use  a field-
provided condensate overflow detection device in
the auxiliary drain connection to provide alarm or
other controls action when the drain pan fills to the
level of the auxiliary drain.

Placing Unit In Ductwork

1.  Utilize flexible transitions on supply and return
connections to reduce noise and vibration trans-
mission to the structure.
2. When the connecting return air duct is smaller
than the coil inlet opening, construct  the transi-
tion piece so that the vertical and horizontal di-
mensions of the transition piece do not increase
more then one inch for every seven inches of
length of the transition piece.
3.  Provide at least three feet of straight duct work
preceding the unit inlet.

INSTALLATION

WARNING

INSURE THAT THE UNIT IS ADE-
QUATELY

SUPPORTED

FROM

STRUCTURE  TO  PREVENT  DAMAGE
OR  INJURY  CAUSED  BY  FALLING
EQUIPMENT!    If  uncertain  about  how
to  connect  to  the  structure,  consult  a
qualified structural engineer.

Fig. 3 — Condensate Drain

Duct Insulation and Vapor Proofing:
Properly select and install duct insulation as
required by the application.
All externally insulated duct work must have an
adequate vapor seal for summer operation. This
is particularly important where the duct is ex-
posed to highly humid conditions in such places
as attics, vented crawl spaces, unconditioned
basements, and utility rooms. The vapor seal
prevents condensation of moisture in the insu-
lating material and subsequent loss of its insu-
lating value.

NOT TO SCALE

MAINTAIN THESE DIMENSIONS FOR ADEQUATE TRAP
SEAL:
A = 3.5” MINIMUM
B = 2.0” MINIMUM

NOTES:
1. CONDENSATE DRAIN PIPING RECOMMENDATIONS:

A. MINIMUM 3/4” Φ PIPE SIZE

B. COPPER OR PVC PIPE MATERIAL
C. USE DIELECTRIC UNION FOR DISSIMILAR METALS.
D. INSULATE PER PROJECT SPECIFICATIONS.

2. PAD OR PLENUM HEIGHT AS REQUIRED TO INSTALL

TRAP AND CONDENSATE DRAIN PIPING.

3. AVOID BLOCKING FILTER SERVICE ACCESS WHEN

INSTALLING CONDENSATE DRAIN PIPING.