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Low Voltage Connections
Several combinations of low voltage schemes are available,
depending on the presence of a heat kit and whether the heat kit
is single-stage or multistaging. The low voltage connections are
determined by whether the outdoor unit is a condenser or heat
pump. The 24V-control voltage connects the air handler to the
room thermostat and condenser. Low voltage wiring is to be
copper conductors. A minimum of 18AWG must be used for
installations up to 50’ (15.2 m) and 16AWG for installations over
50’ (15.2 m). Low voltage wiring can be connected through the
top of the cabinet or either side. See the “Thermostat Wiring”
section of this manual for typical low voltage wiring connections.
REFRIGERANT LINES
WARNING
Goodman 4
This product is factory-shipped under pressure. Follow
these instructions to prevent injury.
CAUTION
Goodman 3
To protect the unit when welding close to the painted
surfaces, the use of a quenching cloth is strongly advised
to prevent scorching or marring of the equipment finish.
Solder with a minimum of 5% silver is recommended.
Tubing Preparation
All cut ends are to be round, burr free and clean. Failure to follow
this practice increases the chances for refrigerant leaks. The
suction line is spun closed and requires pipe cutters to remove
the closed end.
Post Brazing
Quench all welded joints with water or a wet rag.
Piping Size
For the correct tubing size, follow the specification for the
condenser/heat pump.
CAUTION
Applying too much heat to any tube can melt the tube.
Torch heat required to braze tubes of various sizes must
be proportional to the size of the tube. Service personnel
must use the appropriate heat level for the size of the
tube being brazed.
Special Instructions
This coil comes equipped with a check style flowrator for
refrigerant management. For most installations with matching
applications, no change to the flowrator piston is required.
However, in mix-matched applications, a flowrator piston change
may be required. See the piston kit chart or consult your local
distributor for details regarding mix-matched piston sizing. If the
mix-match application requires a different piston size, change the
piston in the flowrator on the indoor coil before installing the coil
and follow the procedure shown below.
IMPORTANT: Torch heat required to braze tubes of various sizes
is proportional to the size of the tube. Tubes of smaller size
require less heat to bring the tube to brazing temperature before
adding brazing alloy. Applying too much heat to any tube can
melt the tube. Service personnel must use the appropriate heat
level for the size of the tube being brazed.
NOTE: The use of a heat shield when brazing is recommended to
avoid burning the serial plate or the finish on the unit. Heat trap or
wet rags should be used to protect heat sensitive components
such as service valves and TXV valves.
1. Loosen the ¹³⁄₁₆" nut one turn only to allow high pressure
tracer gas to escape. No gas indicates a possible leak.
2. After the gas has escaped, remove the nut and discard the
black or brass cap.
3. Remove the check piston to verify it is correct and then
replace the piston. See the piston kit chart in the instructions.
4. Use a tube cutter to remove the spin closure on the suction
line.
5. Remove the tailpiece clamped to the exterior and slide the
¹³⁄₁₆" nut into place.
6. Braze the tailpiece to the line set liquid tube.
C
B
A
D
E
A. Tailpiece
D. White Teflon
®
seal
B. ¹³⁄₁₆ " nut
E. Piston
C. Plastic or brass cap
7. Insert the suction line into the connection.
8. Slide the insulation and the rubber grommet at least 18"
(45.7 cm) away from the braze joint.
9. Braze suction line.
10. After the tailpiece has cooled, confirm position of the white
seal and hand tighten the ¹³⁄₁₆" nut.
®
Teflon
11. Torque the ¹³⁄₁₆" nut to 10 to 25 ft-lbs. or tighten one-sixth
turn.
CAUTION
Goodman 8
Excessive torque can cause orifices to stick. Use the
proper torque settings when tightening orifices.
12. Replace the suction line, grommet and insulation.
B
A
A. Rubber grommet
B. Suction line with spin closure
®Teflon is a registered trademark of E.I. Dupont de Nemours and
Company.
Page 6
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