Carrier 26H - Manual (Page 32)

26H S E R V I C E
Carrier
26H5
a. Open the disconnect switch.
b. Remove all panels.
c. Slowly bleed the system to the atmosphere as
described in Section 8.
d. Front seat the compressor shutoff valves and
the oil return line shutoff valve
e. Unscrew the flare nut at the suction service
valve.
f. Unsolder the liquid line at the entrance to the
twin capillary adopter. Exercise care so that
the adapter is not oxidized internally by over­
heating. Telescope the bottom evaporator re­
flector shroud over the top shroud.
g. Unsweat the two capillaries at the evaporator.
Be careful when using a torch near the evapo­
rator as the evaporator tubes are soft soldered
to the freezing columns.
h. Unsweat the suction line at the evaporator.
j. Disconnect the oil return line from the end bell
of the compressor motor by loosening the flare
nut at the valve.
k. Remove the compressor. The complete assembly
can then be removed. Refer to Section 8 and 4
for evacuating and recharging instructions.
8. DRYER REPLACEMENT
The original dryer has flare connections. See Fig.
10. Slowly bleed the refrigerant charge as follows:
a. Make sure the suction shutoff valve is back-
seated.
b. Remove one of the gauge port plugs.
c. Slowly turn the shutoff valve off backseat to
bleed the refrigerant charge. Bleed slowly
to prevent condenser freezeup.
Evacuate the refrigerant system as follows:
a. Backseat the suction shutoff valve.
b. Frontseat the discharge shutoff valve.
c. Remove one of the discharge gauge port plugs,
and connect a piece of 1/4" copper tubing
about '1 foot long to this gauge port.
d. Start the machine.
e. When the amount of gas coming from the 1/4"
copper tube has decreased appreciably, im­
merse the copper tube into a can of refriger­
ation oil.
f. The gas being expelled will bubble up through
the oil.
g. After bubbling has ceased it can be assumed
the refrigerant system has been evacuated.
h. Remove the tube from the gauge port, and with
the compressor still operating screw in the
gauge port plug. Then backseat the discharge
shutoff valve and turn off the compressor.
Add refrigerant to the system as described in Sec­
tion 4 "Refrigerant Charge".
9. CONDENSER CLEANING AND REPLACEMENT
FLUSHING THE CONDENSER WATER CIRCUIT
Scale deposits on the inside of the condenser water
circuit can significantly reduce the condensèr's
capacity and increase the water consumption. If
the scale becomes too heavy, the head pressure
will increase because of poor heat transfer inside
the condenser.
Obtain the equipment shown in Fig. 15.
Set up the equipment as shown in Fig. 16.
Proced ure
1. Remove the front panel and turn the selector
switch to "Off. "
2. Close the water supply line shut-off valve, and
assemble the equipment to the unit.
3. Mix a solution of inhibited muriatic acid and
wiater in one of the pails. A D D T H E A C I D
T O T H E W A T E R . Mix 1.5 quarts of acid into
3.5 quarts of water.
4. The level of solution in the pail should be
at least 2 " below the bottom of the pump motor.
A V O I D S P I L L I N G A N Y S O L U T I O N .
5. Start the pump and allow it to run 20 minutes,
or until the solution draining back to the pail
contains no foam.
6. While running the pump, mix a solution of
1/4 lb. of baking soda in 8 quarts of water.
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