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GEnEral inFormation
These uncased replacement coils are designed for upflow,
downflow, or horizontal applications.
• Check the coils orifice size and confirm that it's suitable
for application with the intended outdoor unit. Depending
on application, additional installer supplied orifice or
TXV may be required.
• Verify that the air delivery of the furnace/air handler is
adequate to handle the static pressure drop of the coil,
filter, and duct work.
• If precise forming of refrigerant lines is required, a copper
tubing bender is recommended. Avoid sharp bends and
contact of the refrigerant lines with metal surfaces.
• Refrigerant lines should be wrapped with pressure
sensitive neoprene or other suitable material where
they pass against sharply edged sheet metal.
• Horizontal installations require a horizontal drain pan
kit to be installed. See Table 1 (page 3) for part number.
Coil inStallation
WarninG:
this coil is pressurized with nitrogen.
avoid direct face exposure or contact with
valve when gas is escaping. always ensure
adequate ventilation is present during the
depressurization process. any uncertainties
should be addressed before proceeding.
WarninG:
Shut off all electrical power to the furnace and
outdoor condensing unit before performing any
maintenance or service on the system. Electric
furnaces may be connected to more than one
supply circuit.
CaUtion:
the coil must be level to ensure proper
condensate drainage. an unlevel installation
may result in structural damage, premature
equipment failure, or possible personal injury.
1. Disconnect all electrical power to the furnace or air
handler.
2
NITROGEN
1
HEALTH
0
FLAMMABILITY
0
REACTIVITY
0 Minimal Hazard
1 Slight Hazard
2. Remove system refrigerant per industry standard
practices.
3. Disconnect and remove existing evaporator coil.
System Depressurization
1. Remove the cap (Figure 1) from the end of the liquid
line.
2. Verify pressurization by depressing the Schrader valve
on the end of the liquid line. Listen for any escaping gas.
If there is no pressure, test the coil for leakage.
• If leakage is found, clearly mark the location of the leak
and return the coil to the distributor for processing.
• If no leaks are found, the coil may be installed.
3. Depress the valve to relieve all pressure from the coil.
4. Proceed to the appropriate lineset connection for
installations with factory installed orifice. See pages
4 - 5.
5. Go to Changing the Orifice section if your installation
is with a different orifice.
6. Go to Installing a TXV kit (page 3) if your installation is
equipped with a TXV.
Schrader
Valve
Cap
Figure 1. Suction & liquid line locations
Changing the orifice
important: Before proceeding, perform steps 1 - 3 in the
System Depressurization section and confirm that the restrictor
orifice size meets the requirements outlined in the outdoor unit
installation manual. Restrictorkit(PN917700)containsvarious
restrictors from size .051 to 0.103. Individual restrictors are
available by part number - PN 664*** (where *** represents
the size).
Example: 664103 is a restrictor 0.103 inches in diameter.
Factory supplied orifice sizes are listed in Table 2 (page 3). If
the orifice must be replaced, follow steps 1 - 5.
CaUtion:
to prevent damage to the unit or internal
components, it is recommended that two
wrenches be used when loosening or tightening
nuts. Do not over tighten!
1. Using two wrenches, loosen the nut and distributor body
as shown in Figure 2. Turn the assembly nut counter-
clock-wise until the orifice body halves are separated.
2. Insert a light-gauge wire hook between the distributor
body and the restrictor orifice while being careful not
Suction
Line
Liquid
Line
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