Nortek C7BA, Manual

Page: 4 / 16

4
NOTE:
The holes in the drain pan extension should be
pressed over the nibs molded into the drain pan. Which
pair of holes to use will depend on whether the unit is
installed horizontal left or horizontal right. Verify proper
positioning for clearance thru the top of the coil cabinet
before affixing. The drain pan extension can be installed
and removed after the ductwork has been attached to the
cased coil.
7. Connect the refrigerant lines as outlined in the Refrigerant
Lines Connection section.
8. Seal the enclosure as required to minimize air leakage.
9. Reinstall the coil access door.
10. Restore electrical power to the furnace.
Horizontal Right Installations
1. Disconnect all electrical power to the furnace.
2. Remove the coil access door.
3. Remove the plug and knockout from one of the threaded
holes in the horizontal drain pan.
CAUTION:
The knockout must be removed and discarded
to ensure proper condensate drainage. Failure to
do so may result in structural damage, premature
equipment failure, or possible personal injury.
4. Place the horizontal drain pan on the opposite side of the
coil.
NOTE:
If unit has 2 sets of knockouts, remove the
other set of knockouts in the coil spacing plates and insert
support rod.
5. Install plug (from horizontal drain pan) in the open drain
hole in the drain pan at the bottom of the unit. This will
block bypass air from entering the system.
6. Slide the coil and the horizontal drain pan assembly back
into the unit.
7. Remove the drain line knockout from the coil access door.
This will allow access to the horizontal drain.
8. Install drain pan extension (if supplied with unit).
NOTE: The holes in the drain pan extension should be
pressed over the nibs molded into the drain pan. Which
pair of holes to use will depend on whether the unit is
installed horizontal left or horizontal right. Verify proper
positioning for clearance thru the top of the coil cabinet
before affixing. The drain pan extension can be installed
and removed after the ductwork has been attached to the
cased coil.
9. Connect the refrigerant lines as outlined in the Refrigerant
Lines Connection section.
10. Seal the enclosure as required to minimize air leakage.
11. Reinstall the coil access door.
12. Restore electrical power to the furnace.
Downflow Installations
C7 coils may be installed in downflow applications. It is
required that the furnace and coil cabinets are securely
mounted together before setting in place. Fossil fuel
applications require the coil to be placed in the supply air
stream only.
REFRIGERANT LINE CONNECTIONS
IMPORTANT NOTE TO INSTALLER
C7 Coils are not factory charged with refrigerant. It will
be necessary to evacuate the indoor coil and lineset
prior to charging. Refer to the outdoor unit installation
manual for detailed charging instructions.
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. Remove and discard the valve core and valve core holder
on the liquid line.
5. Remove the rubber plug from the suction line.
Installing the TXV
(For Optional Bulkhead Mounted TXV’s)
1. Install the TXV retaining nut onto the inlet end of the TXV.
See
Figure 6 (page 8)
.
2. Add small amount of HVAC approved thread lock to the
inlet end of the TXV.
3. Install the liquid line and accessory retaining nut onto the
end of the TXV. For liquid line kit numbers, see
Table 2,
(page 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!
4. Align the retaining nut on the TXV body and hand tighten
both components. Mark a line on both bodies and then
tighten an additional ¼ turn using two wrenches. See
Figure
2 (page 5)
.
NOTE:
The movement of the two lines will
show how much the nut is tightened. If a torque wrench
is used, tighten to 10-12 ft lbs or 14-16 Nm.
Orifice Removal & Installation
NOTE: 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. Factory supplied orifice sizes are
listed in
Table 3
,
Table 4
, or
Table 5, (page 7)
. If the orifice
must be replaced, follow steps 1 - 5.
Suction
Line
Liquid
Line
Cap
Schrader
Valve
Figure 1. Suction & Liquid Line Locations