17
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.
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.
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 on the 060 size, only the 2 wire ties
fastened to the outdoor coils and reversing
valve/accumulator have been removed.
e. Make sure that all tools and miscellaneous loose parts
have been removed.
5. Compressors are internally spring mounted. Do not loosen
or remove compressor hold--down bolts.
6. Each unit system has 2 Schrader--type ports, one low--side
Schrader fitting located on the suction line, and one
high--side Schrader fitting located on the compressor
discharge line. Be sure that caps on the ports are tight.
FAN GRILLE
MOTOR
1/8" MAX BETWEEN
MOTOR AND FAN HUB
MOTOR SHAFT
C99009
Fig. 21 -- Fan Blade Clearance
START--UP
CHECKING COOLING AND HEATING CONTROL
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 according to
time delay selected on the Easy Select board (See
Easy Select Section) when FAN MODE switch is
placed in AUTO position.
(2.) Thermostat:
When the room temperature rises to a point that is
slightly above the cooling control setting of the
thermostat, the thermostat completes the circuit
between thermostat terminal R to terminals Y, O
and G.These completed circuits through the
thermostat connect contactor coil (C) (through
unit wire Y) and ECM board (through unit wire
G) across the 24--v. secondary of transformer
(TRAN).
Thermidistat or Thermostat and Humidistat:
When the room temperature rises to a point that is
slightly above the cooling control setting of the
thermostat, the thermostat completes the circuit
between thermostat terminal R to terminals Y, O,
DH, and G. These completed circuits through the
thermostat connect contactor coil (C) (through
unit wire Y) and ECM board (though unit wire
G) across the 24--v. secondary of transformer
(TRANS).
(3.) Place system switch or MODE control in HEAT
position. Set control above room temperature.
Observe that compressor, outdoor fan, and indoor
blower motors start. Observe that heating cycle
shuts down according to time delay selected on
the Easy Select board (See Easy Select Section)
when control setting is satisfied.
(4.) When using an automatic changeover room
thermostat place both SYSTEM or MODE
control and FAN mode switches in AUTO
positions. Observe that unit operates in Cooling
mode when temperature control is set to “call for
Cooling” (below room temperature), and unit
operates in Heating mode when temperature
control is set to “call for Heating” (above room
temperature).
NOTE
: Once the compressor has started and then has stopped, it
should not be started again until 5 minutes have elapsed. The
cooling cycle remains “on” until the room temperature drops to
point that is slightly below the cooling control setting of the room
thermostat. At this point, the thermostat “breaks” the circuit
between thermostat terminal R to terminals Y and G. These open
circuits de--energize contactor coil C and ECM board. The
condenser and compressor motors stop. After the time delay
setting selected on the Easy Select board (See Easy Select
Section) , the blower motor stops. The unit is in a “standby”
condition, waiting for the next “call for cooling” from the room
thermostat. The 5 minute compressor delay also applies to heat
pump heating mode.
Step 1 — Check for Refrigerant Leaks
Locate and repair refrigerant leaks and charge the unit as follows:
1. 1. Use both high-- and low--pressure ports to relieve
system pressure and reclaim remaining refrigerant.
2. Repair leak following accepted practices.
NOTE
: Install a bi--flow filter drier whenever the system has
been opened for repair.
3. Check system for leaks using an approved method.
4. Evacuate refrigerant system and reclaim refrigerant if no
additional leaks are found.
5. Charge unit with R--410A refrigerant, using a
volumetriccharging cylinder or accurate scale. Refer to
unit rating plate for required charge.
604D
