PHD4 Series K and WPH4 Series K: Installation Instruction
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
21
Pre-Start-Up
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
).
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 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.
c. 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 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.
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
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 Indoor Fan board (through unit wire G)
across the 24-v. secondary of transformer (TRAN).
(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 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 defrost board has a
built-in 5 minute delay between cycles. The 5 minute compressor delay
also applies to heat pump heating mode.
Step 1 – 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 bi-flow 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 from refrigerant system and evacuate to 500
microns if no additional leaks are not found.
5. Charge unit with R-410A refrigerant, using an electronic scale.
Refer to unit rating plate for required charge.
Step 2 – 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).
IMPORTANT:
Three-phase, scroll compressors are direction oriented.
Unit must be checked to ensure proper compressor 3-phase power lead
orientation. If not corrected within 5 minutes, the internal protector will
shut off the compressor. The 3-phase power leads to the unit must be
WARNING
!
FIRE, EXPLOSION, ELECTRICAL SHOCK AND
ENVIRONMENTAL HAZARD
Failure to follow this warning could result in personal injury, death 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. Do not remove compressor plug until all electrical sources are
disconnected and tagged.
4. Never attempt to repair soldered connection while refrigerant
system is under pressure.
5. Do not use torch to remove any component. System contains oil
and refrigerant under pressure.
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.
WARNING
!
EXPLOSION HAZARD
Failure to follow this warning could result in
death, serious personal injury, and/or
property damage.
Never use air or gases containing oxygen for
leak testing or operating refrigerant
compressors. Pressurized mixtures of air or
gases containing oxygen can lead to an
explosion.
