Installation Instructions — R90C | R90H
Installation
Verify the existing wall thickness
1.
— the distance from the
condenser coil to the outdoor louver varies with the sleeve depth.
Each chassis includes standard air baffles to accommodate the
most common condenser coil to outdoor louver requirements.
In addition, we stock an optional condenser-side air baffle kit for
chassis installation in deeper than standard walls.
NOTICE
The R90C | R90H chassis is 18 ” deep for 9, 12, 15 Btuh models.
The standard depth for the 18 Btuh is 24", However EMI can
supply it for an18” chassis on demand (consult factory).
Install duct collar and slide-duct —
2.
remove duct collar
and slide-duct from packaging. Affix ¹∕₄” x ¾” foam tape to the
bottom flanges of the duct collar (this serves as a gasket between
the collar and the unit). Securely fasten duct collar over discharge
openining with screws provided. Insert slide-duct into duct collar
(see Figure 28).
Verify air supply alignment —
3.
slide the unit into the wall-
sleeve. The supply duct on the cooling chassis should line up with
the supply vent on the room cabinet. The weather angles should
need no adjustment.
Install the baffles
4.
— slide the unit back out of the wall sleeve.
Remove the baffles from the kit bag supplied with unit. Install
the left and right side baffles on the condenser coil by completing
steps below:
Baffles must come in contact with the outdoor louver.
•
Make sure the baffles are directed inward toward the center of
•
coil (see Figure 29).
Secure baffles tightly into the existing holes of the condenser coil
•
using the screws provided.
NOTICE
The correct condenser air baffles must be installed or performances
may be impaired.
Install the foam tape
5.
— apply ¹∕₂” x ¹∕₂” open-cell foam strips
around the top of the supply air duct collar to ensure that all the
conditioned air is delivered into the room (see Figure 29). Failure
to do so results in recirculation of the conditioned air through the
cabinet unit causing the unit to short cycle.
Install the foam tape
6.
— Apply 1” x 1” open-cell foam strips
to the wether angle this prevents outside air from entering around
the chassis to the room from the sides and top of the cabinet.
Install the strips to weather strip between the wall sleeve and the
cooling chassis (see Figure 30). It is imperative to have a solid
air seal between the wall sleeve and the chassis. Failure to do so
will result in air leakage from outdoor to indoor causing system
problems
(example — coils freezing, short cycling, and constant run-
ning of unit)
. If there is a need for more foam than supplied in kit,
consult the factory.
Connecting the optional hydronic coil
7.
— if the hydronic
heat option has been ordered, then the hydronic coil will need to
be field installed on the new unit. The coil with the old unit can be
located in the subbase, under the chassis in a special attachment,
or above the chassis in a special attachment. It is necessary to
know where the coil is to be located and the physical size of the
coil so the new coil can be verified if ordered for replacement.
The new coil should be installed in the same manner as the coil
it is replacing.
Remove the 2-position connector assembly from kit bag supplied
•
with unit (
this will have 2 yellow wires attached
).
Connect this 2-position connector to the 2-position connection
•
located on the bottom of the control box panel.
Connecting the accessory Aquastat
8.
— if the accessory
Aquastat has been ordered then it will need to be field installed.
Remove the black jumper wire located on the bottom panel of the
•
control box (
this is also terminated with a 2-position connector
).
Cut the jumper wire in the middle and splice the Aquastat to
•
the jumper.
Place the connector back into original location. Refer to the wir-
•
ing diagram on the unit for details.
Secure the chassis
9.
— after ensuring that all seals are the cor-
rect size and in the proper location and the correct baffles are
attached to the condenser coil and in the proper orientation,
slide the unit into final position and tighten any tie down bolts or
screws as necessary.
Install the control section
10.
— Remove the front cover of the
unit. In a unit mount installation, take the thermal bulb from
the control section and run the capillary tube bulb along the
unit to the blower section. (There will be no thermostat bulb if
a remote thermostat option is used.) While looking at the sides
of the blower housing, there are two clips that will support the
thermal bulb. Remove the screws (keep screws to reattach) that
hold these clips and slide the thermal bulb into the clips. Fasten
the clips back into place, making sure to not kink the bulb. After
the thermostat is in place, mount the control box in the cabinet in
the same location as the old control box ,reinstall the front cover
of the unit and finish the installation.
Hard-wired units
11.
— If the unit is hard wired, follow the in-
structions on page 11 to verify existing wiring and overcurrent
protection. Hard wire the line voltage to control box and plug
cooling chassis line cord into control box receptacle and molex
plugs. Remove the line cord wires from the PTAC/PTHP power
entrance terminals. Route the power supply wiring through a
strain-relief bushing and connect leads to the power entrance ter-
minals. Secure the strain-relief clamp. (If wiring is through conduit,
insert the conduit through the control box knockout and secure
in place.)
DO NOT
turn on power until completing instructions
in "Final Inspection and Startup" on page 26.
DO NOT PLUG IN the line cord, if used
12.
. Follow instructions
in "Final Inspection and Startup" on page 26.
Replacement Packaged Terminal Air-Conditioning / Heat Pump
• Installation, Operation, and Maintenance Manual •
The Right Fit for Comfort
22
P/N 240008034, Rev. D [7/29/2011]
