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PRE- -START- -UP
WARNING
!
ENVIRONMENTAL,
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death and/or property damage.
1. Follow recognized safety practices and wear
protective goggles when checking or servicing
refrigerant system.
2. Relieve and recover all refrigerant from system
before touching or disturbing compressor plug if
refrigerant leak is suspected around compressor
terminals.
3. Never attempt to repair soldered connection while
refrigerant system is under pressure.
4. Do not use torch to remove any component.
System contains oil and refrigerant under pressure.
5. To remove a component, wear protective goggles
and proceed as follows:
a. Shut off electrical power to unit and install
lockout tag.
b. Relieve and reclaim all refrigerant from
system using both high-- and low--pressure
ports.
c. Cut component connecting tubing with
tubing cutter and remove component from
unit.
d. Carefully unsweat remaining tubing stubs
when necessary. Oil can ignite when
exposed to torch flame.
Use the Start--Up Checklist supplied at the end of this book and
proceed as follows to inspect and prepare the unit for initial
start--up:
1. Remove all access panels (see Figure 16).
2. Read and follow instructions on all DANGER, WARNING,
CAUTION, and INFORMATION labels attached to, or
shipped with unit.
3. Make the following inspections:
a. Inspect for shipping and handling damages, such as
broken lines, loose parts, disconnected wires, etc.
b. Inspect for oil at all refrigerant tubing connections and
on unit base. Detecting oil generally indicates a
refrigerant leak. Leak test all refrigerant tubing
connections using electronic leak detector, or
liquid--soap solution. If a refrigerant leak is detected,
see following Check for Refrigerant Leaks section.
c. Inspect all field-- and factory--wiring connections. Be
sure that connections are completed and tight.
Ensure wires do not touch refrigerant tubing or sharp
sheet metal edges.
d. Inspect coil fins. If damaged during shipping and
handling, carefully straighten fins with a fin comb.
4. Verify the following conditions:
a. Make sure that outdoor--fan blade is correctly
positioned in fan orifice.
b. Make sure that air filter(s) is in place.
c. Make sure that condensate drain pan and trap are
filled with water to ensure proper drainage.
d. Make sure that all tools and miscellaneous loose
parts have been removed
5. Each unit system has two (2) Schrader--type ports, one
low--side Schrader fitting located on the suction line, and
51901190402
FIRE,
EXPLOSION,
one high--side Schrader fitting located on the compressor
discharge line. Be sure that caps on the ports are tight.
START- -UP
Step 1 — Check Cooling and Accessory Electric
Heat (if applicable) Operation
Start and check the unit for proper control operation as follows:
1. Place room thermostat SYSTEM switch or MODE control
in OFF position. Observe that blower motor starts when
FAN mode is placed in FAN ON position and shuts down
when FAN MODE switch is placed in AUTO position.
2. Thermostat:
On a typical two stage thermostat, when the room
temperature rises 1 or 2 degrees above the cooling
control setting of the thermostat, the thermostat
completes the circuit between thermostat terminal R and
terminals Y1, and G. These completed circuits through
the thermostat connect the contactor coil (C) (through
unit wire Y1) and indoor fan board (through unit wire G)
across the 24--v. secondary of transformer (TRAN).
On a typical two stage thermostat, when the room
temperature is several degrees above the cooling control
setting of the thermostat, the thermostat completes the
circuit between terminal R and terminals Y1, Y2 , and G.
3. If your unit contains accessory electric heat, place
system switch or MODE control in HEAT position. Set
control above room temperature. Observe that the indoor
blower is operating and warm air is flowing through the
supply air vents inside your home. Observe that the
heating cycle shuts down when the control setting is
satisfied.
If your unit does not contain accessory electric heat and
you would like to obtain it, please contact your local
dealer for more information.
4. When using an automatic changeover room thermostat
place both SYSTEM or MODE control and FAN mode
stitches in AUTO positions. Observe that unit operates in
Cooling mode when temperature control is set to "call for
Cooling" (below room temperature).
NOTE:
Once the compressor has started and then has
stopped, it should not be started again until 5 minutes have
elapsed.
Step 2 — Check for Refrigerant Leaks
Proceed as follows to locate and repair a refrigerant leak and to
charge the unit:
1. Locate leak and make sure that refrigerant system
pressure has been relieved and reclaimed from both
high--and low--pressure ports.
2. Repair leak following Refrigerant Service procedures.
NOTE:
Install a filter drier whenever the system has been
opened for repair.
3. Add a small charge of R--410A refrigerant vapor to
system and leak--test unit.
4. Recover
refrigerant
evacuate to 500 microns if no additional leaks are found.
5. Charge unit with R--410A refrigerant, using an electronic
scale. Refer to unit rating plate for required charge.
Step 3 — Start- -Up Adjustments
Complete the required procedures given in the Pre--Start--Up
section before starting the unit. Do not jumper any safety
devices when operating the unit. Do not operate the unit in
cooling mode when the outdoor temperature is below 40_F
(4_C) (unless accessory low--ambient kit is installed).
Checking and Adjusting Refrigerant Charge
The refrigerant system is fully charged with R--410A refrigerant
and is tested and factory sealed.
from
refrigerant
system
and
11
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