7
Control Box Components See
Figure 10 for th
e location of the
electrical components.
XII
Outside Thermostat
An outside thermostat kit that includes an emergency heat relay
is available as an accessory. Follow the manual provided with
the OT/EHR18-60 for installation practices.
XIII
System Evacuation and Charging
To avoid possible explosion, death, or injury, practice safe handling
of refrigerants.
While these items will not cover every conceivable situation, they
should serve as a useful guide:
Refrigerants are heavier than air. They can “push out” the oxygen
in your lungs or in any enclosed space. To avoid possible death
or difficulty in breathing.
¾
Never sniff refrigerant.
¾
Never purge refrigerant.
If an indoor leak is suspected, thoroughly ventilate the area before
beginning work.
Liquid refrigerant can be very cold. To avoid possible frostbite or
blindness, avoid contact and wear gloves and goggles. If liquid
refrigerant does contact your skin or eyes, get medical help
immediately.
Always follow EPA regulations. Never burn refrigerant, as
poisonous gas will be produced.
To avoid possible explosion or equipment damage do not exceed
150 psig when pressure testing.
After you reach 150 psig, close the valve on the nitrogen
cylinder. Disconnect it from the gauge manifold. If you plan to
use an electronic leak detector, add a trace of R-22 to the
system (if permitted by current EPA regulations).
5.
Apply a soap solution on all connections and joints. If you
see bubbles, you have a leak. Mark these locations.
6.
Use the gauge manifold to carefully release the nitrogen from
the system. If leaks were found, repair them. After repair,
repeat the above pressure test. If no leaks exist, proceed to
system evacuation.
WARNING
WARNING
Leak Testing
To avoid possible explosion, the line from the nitrogen cylinder
must include a pressure regulator and a pressure relief valve.
The pressure relief valve must be set to open at no more than
150 psig.
2.
Connect a cylinder of dry nitrogen to the center port on the
gauge manifold.
3.
Open the hand valve a minimal amount on the line coming
from the nitrogen cylinder.
4.
Open the high pressure valve on the gauge manifold.
Pressurize the refrigerant lines and the indoor coil to 150
psig (1034 kPA).
To avoid the risk of fire or explosion never use oxygen high
pressure or flammable gasses for leak testing of a refrigeration
system.
1.
Be sure both hand valves on the gauge manifold are closed
relative to the center port (i.e., turned in all the way.) Attach
this gauge manifold to the service valves on the unit.
WARNING
WARNING
To avoid possible explosion, use refrigerant cylinders properly:
¾
If you must heat a cylinder for faster charging, partly immerse
it in warm water. Never apply flame or steam to the cylinder.
¾
Store cylinders in a cool, dry place. Never use a cylinder as a
platform or a roller.
¾
Never add anything other than R-22 to an R-22 cylinder.
¾
Never fill a cylinder more than 80% full of liquid refrigerant.
¾
When removing refrigerant from a system, use only returnable
(not disposable) service cylinders. Check the cylinder for its
pressure rating and hydrostatic test date. Check the cylinder
for any damage, which may lead to a leak or explosion. If in
doubt, do not use the cylinder.
HIGH VOLTAGE
ENTRANCE
LOW VOLTAGE
ENTRANCE
CAPACITOR
CONTACTOR
HIGH VOLTAGE
CONNECTIONS
GROUND LUG
LOW VOLTAGE
CONNECTIONS
CONDENSER FAN
DEFROST RELAY
DEFROST
CONTROL
Figure 10.