Reznor JT4BD Users Manual - Manual (Page 14)

14
13 SEER SPLIT SYSTEM HEAT PUMP ORIFICE USAGE
2. With compressor running in heat mode,
fi rst jump the “T2”-”DFT” test pins. This
will indicate to board that defrost T-stat is
closed. Defrost T-stat closes at 32°, opens
at 68°.
3. Next jump the “Test” pin to “C” on terminal
strip. This will initiate defrost test in 5, 10 or
15 seconds (This is determined by 30, 60
or 90 minutes defrost pin settings). Factory
setting will be 30 minutes.
4. When the reversing valve shifts to the
defrost mode, quickly remove jumper from
“Test”-”C”. If the jumper is not removed
within a 5 second period, the defrost test
will terminate. Unit will continue to stay in
defrost mode Until :
A) Board recognizes that defrost
sensor has reached 68° and
opened or
B) “T2”-”DFT” jumper is removed or
C) 10 minutes have elapsed (board
override)
If the above steps will not initiate a defrost, replace
the defrost board.
Anti Short Cycle Timer Test
The 5 minute time delay feature can be bypassed
or shortened to 1 second by jumping the “Test”
to “C” terminal.
Note: If jumper is left on the “Test” to “common”
pins permanently, the defrost cycle will become
inoperable.
Optional Equipment — A functional checkout
should be performed in accordance with
the checkout procedures supplied with the
equipment.
Adjustment of Refrigerant Charge:
CAUTION:
Split system heat pump equipment
contains liquid and gaseous refrigerant
under pressure . Adjustment of
refrigerant charge should only be
attempted by qualified, trained
personnel thoroughly familiar with the
equipment. Under no circumstances
should the homeowner attempt to
install and/or service this equipment.
Failure to comply with this warning
could result in equipment damage,
personal injury, or death.
NOTE: The following Refrigerant Charging
Charts are applicable to listed assemblies of
equipment and at listed airfl ows for the indoor
coil. Assemblies of indoor coils and outdoor units
not listed are not recommended.
Model System Charge
Number Indoor Outdoor R-410A (oz.)
1-1/2 Ton .050 .042 112
2 Ton .055 .045 138
2-1/2 Ton .065 .048 145
3 Ton .073 .052 168
3-1/2 Ton .077 .055 243
4 Ton .080 .058 248
5 Ton .089 .062 248
Restrictor Bore Size (in.)