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jumper J1 and wire in a standard humidistat (See Fig.
14).
e. DEHUMIDIFY AND SUPER DEHUMIDIFY
CAPABILITIES
This model unit is capable of responding to a signal
from indoor system control (Thermidistat or capable
zoning control) to operate in comfort control modes
such as Super Dehumidify Mode. Consult literature
provided with indoor system control to determine if
these operating modes are available, and to see control
set up instructions. No special setup or wiring of unit
is required.
TRANSFORMER PROTECTION
The transformer is of the energy- -limiting type. It is set to
withstand a 30- -sec. overload or shorted secondary condition.
PRE- -START- -UP
WARNING
!
FIRE, EXPLOSION, ELECTRICAL SHOCK 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. Do not operate compressor or provide any electric power
to unit unless compressor terminal cover is in place and
secured.
3. Do not remove compressor terminal cover until all
electrical sources are disconnected and tagged.
4. Relieve and recover all refrigerant from system before
touching or disturbing anything inside terminal box if
refrigerant leak is suspected
terminals.
5. Never attempt to repair soldered connection while
refrigerant system is under pressure.
6. 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.
Proceed as follows to inspect and prepare the unit for initial
startup:
1. Remove access panel.
2. Read and follow instructions on all 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.
c. Leak test all refrigerant tubing connections using
electronic leak detector, halide torch, or liquid- -soap
solution. If a refrigerant leak is detected, see the Check
for Refrigerant Leaks section.
around compressor
d. Inspect all field- - and factory- -wiring connections. Be
sure that connections are completed and tight.
e. Inspect coil fins. If damaged during shipping and
handling, carefully straighten fins with a fin comb.
4. Verify the following conditions:
WARNING
!
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal injury,
death or property damage.
Do not purge gas supply into the combustion chamber. Do not
use a match or other open flame to check for gas leaks.
a. Make sure gas line is free of air. Before lighting the
unit for the first time, perform the following with the
gas valve in the "OFF" position:
If the gas supply pipe was not purged before
connecting the unit, it will be full of air. It is
recommended that the ground joint union be loosened,
and the supply line be allowed to purge until the odor
of gas is detected. Never purge gas lines into a
combustion chamber. Immediately upon detection of
gas odor, retighten the union. Allow 5 minutes to
elapse, then light unit.
b. Make sure that condenser- -fan blade is correctly
positioned in fan orifice. Leading edge of
condenser- -fan blade should be 1/2 in. (12 mm)
maximum from fan orifice.
c. Ensure fan hub is 1/8 in. (3 mm) maximum from
motor housing (See Fig. 15).
d. Make sure that air filter(s) is in place.
e. Make sure that condensate drain trap is filled with
water to ensure proper drainage.
f. Make sure that all tools and miscellaneous loose parts
have been removed.
MOTOR
1/8" MAX BETWEEN
MOTOR AND FAN HUB
Fig. 15 - - Fan Blade Clearance
START- -UP
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 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. Evacuate and recover refrigerant from refrigerant system if
additional leaks are not found.
5. Charge
unit
with
volumetriccharging cylinder or accurate scale. Refer to
unit rating plate for required charge. Be sure to add extra
refrigerant to compensate for internal volume of filter
drier.
15
FAN GRILLE
MOTOR SHAFT
C99009
R- -410A
refrigerant,
using
a
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