Specifications

5
IV. UNIT LOCATION /
INSTALLATION
Inspect for shipping damage immediately at delivery, and
file claims immediately with the shipping company. Check
to ensure that units have correct model numbers, electrical
ratings, and accessories that match the original order.
CAUTION – Units must be kept in an upright position
during transportation or installation, or severe internal
damage may occur.
Important – To ensure easy removal and replacement of
access panels, leave panels secured in place until the unit is
set in place and leveled.
Important – Locate the unit in an indoor area where the
ambient temperature will remain between 45
o
F and 104
o
F.
Service is done primarily from the front. Top and rear
access is desirable and should be provided when possible.
CAUTION – Do not use this unit during construction.
Dust and debris may quickly contaminate electrical and
mechanical components; resulting in damage.
CAUTION – Before driving screws into the cabinet,
check on the inside of the unit to ensure the screw will not
damage electrical, water, or refrigeration lines.
The Installation Process is made up of these Steps:
1. Confirm sufficient air flow.
2. Confirm sufficient electrical service.
3. Install the Air Handler Unit; keeping the A-Coil sealed
until braze connections will be made.
4. Install the Refrigerant Line Set; keeping it sealed until
braze connections will be made. Protect the cabinet
panel finish during brazing, and slide the grommets
temporarily away from the brazing area.
5. Open the braze connections, and braze the Refrigerant
Line Set to the CU and to the AHU.
6. Properly evacuate the Refrigerant Line Set and A-coil.
7. Properly open the Service Valves on the CU and ensure
the seal caps are fully restored and properly tightened
(finger tight plus 1/12
th
turn (1/2 hex flat)).
8. Re-check all braze connections for leaks.
9. Complete operational checkout.
A. Air Handler Unit Installation
Install the AHU for Split System applications. Note – The
AHU has an internal Thermostatic Expansion Valve with
integrated check valve sized for the A-Coil. Check the air
coil for cleanliness and clean if needed. Note Remove any
shipping material (if provided) that supported the blower
assembly Note – The A-coil is factory-sealed with a small
holding charge of nitrogen. Prior to brazing the refrigerant
line set, cut off the ends to release the holding charge.
Important – The AHU condensate pan is a combination
vertical/horizontal pan with double drains that require field-
installed externally vented traps. The primary drain is 3/4”
MPT, and the secondary drains are 3/4” FPT (FPT are
plugged). To use a secondary drain in addition with the
primary drain, remove the corresponding knockout on the
front of the cabinet and the corresponding plastic plug.
Important – Close/plug any unused drain openings.
Air Vent
3" Rise
6" drop
minimum
Unit Cabinet
The condensate line leaving the U bend of the condensate
trap must be at least 3” below the base of the unit. This
requires the U bend to be 6” below the unit to give the
upward portion of the U bend a 3” rise. The condensate trap
should be vented after the U bend to break the negative
pressure in the air chamber and allow the condensate to
flow. The unit must be level, and the condensate line should
be pitched away from the unit a minimum of 1/8” per foot.
If the unit produces an odor in the cooling mode, the
condensate trap or line may be plugged, or the unit may not
be pitched correctly. A small amount of bleach may be
poured down the condensate drain in the heat pump to kill
any bacterial growth.
CAUTION – The AHU requires a field-installed filter
and filter rack. Ensure the pressure drop of the air filter is
less than 0.1 inch of water column at the specified CFM.
B. Refrigeration Line Set Installation
Use ACR or L copper tubing and fittings, ensure cutoff
burrs are removed from the line openings, and blow out the
lines with dry nitrogen before making connections.
CAUTION – Insulation on the line set must be suitable
for heat pump application, R410A refrigerant, and be at
least 1/2” thick (Under certain heating-mode conditions, the
refrigerant in the vapor line may approach 200
◦
F.) Never
reuse a refrigerant line set.
If the line set is kinked or distorted and can’t be formed
back to its original shape, replace the damaged portion. A
deformation is defined as 10% of the cross section being
restricted and will affect performance. When passing line
sets through a wall, seal the opening with silicon-based
caulk. Important – Both the vapor line and the liquid line
must be isolated from direct contact with water pipes, duct
work, floor joists, wall studs or other structural components
that could transmit vibration and noise to the living space.
Use hanger straps with isolation sleeves to suspend
refrigerant tubing from joists.
Important – All brazing must be performed using
nitrogen circulating at 2-3 psig to prevent oxidation inside
the tubing. Use Silflo 15, or equivalent, for the braze
material. Always use wet rags to protect Service Valves, and
use shielding to protect the finish on cabinets.