American Standart 4A6H4 Manual do instalador - Página 4
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INSTALLER'S GUIDE
2. Attach appropriate hoses from manifold gauge to gas and
liquid line pressure taps.
NOTE: Unnecessary switching of hoses can be avoided and complete
evacuation of all lines leading to sealed system can be accomplished
with manifold center hose and connecting branch hose to a cylinder
of R-410A and vacuum pump.
3. Attach center hose of manifold gauges to vacuum pump.
4. Evacuate until micron gauge reads no higher than 350 microns.
5. Close off valve to vacuum pump and observe the micron gauge.
If gauge pressure rises above 500 microns in one (1) minute, then
evacuation is incomplete or system has a leak.
6. If vacuum gauge does not rise above 500 microns in one (1)
minute, the evacuation should be complete.
7. Blank off vaccuum pump and micron gauge, close valves on
manifold gauge set.
NOTE:
DO NOT VENT REFRIGERANT INTO THE
ATMOSPHERE.
8. The liquid line shut-off valve can now be opened. Remove
shut-off valve cap. Fully insert hex wrench into the stem and
back out counterclockwise until valve stem just touches rolled edge
(approximately five [5] turns) observing WArNING statement on
page 3. See Figure 3.
NOTE: A 3/16" Allen wrench is required to open liquid line service
valve. A 1/4" Open End or Adjustable wrench is required to open
gas line valve. A 3/4" Open End wrench is required to take off the
valve stem cap.
9.
Replace liquid service pressure tap port cap and valve stem
cap. These caps MUST BE rEPLACED to prevent leaks. Re-
place valve stem and pressure tap cap finger tight, then tighten
an additional 1/6 turn.
10. The gas valve can now be opened. For a ball type gas valve,
open the gas valve by removing the shut-off valve cap and turning
the valve stem 1/4 turn counterclockwise, using 1/4" Open End or
Adjustable wrench. See Figure 4. For brass gas line service valve
opening, follow 9 and 10 above. See Figure 5.
11. The gas valve is now open for refrigerant flow. Replace
valve stem cap to prevent leaks. Again, these caps MUST BE
rEPLACED to prevent leaks. Replace valve stem and pressure
tap cap finger tight, then tighten an additional 1/6 turn. See
Figure 4.
If refrigerant lines are longer than 15 feet and/or a different size
than recommended, it will be necessary to adjust system refrigerant
charge upon completion of installation. See unit Service Facts.
E. ELECTrICAL CONNECTIONS
wARNING:
▲
equipment, ALWAyS exercise basic safety precautions to
avoid the possibility of electric shock.
1. Power wiring and grounding must comply with local codes.
2. Power supply must agree with equipment nameplate.
3. Install a separate disconnect switch at the outdoor unit.
4. Ground the outdoor unit per local code requirements.
5. Provide flexible electrical conduit whenever vibration transmis-
sion may create a noise problem within the structure.
6. The use of color coded low voltage wire is recommended to
simplify connections between the outdoor unit, the thermostat
and the indoor unit.
PAGE 4
When installing or servicing this
PIN IDENTIfIcATIoN
6
Table 1 — NEC Class II Wiring
24 VOLTS
WIRE SIZE
18 AWG
16 AWG
14 AWG
7. Table 1 defines maximum total length of low voltage wiring
from outdoor unit, to indoor unit, and to thermostat.
8. Mount the indoor thermostat in accordance with instruction
included with the thermostat. Wire per appropriate hookup dia-
gram (included in these instructions).
F. DEFrOST CONTrOL
The demand defrost control measures heat pump outdoor ambi-
ent temperature with a sensor located outside the outdoor coil. A
second sensor located on the outdoor coil is used to measure the
coil temperature. The difference between the ambient and the
colder coil temperature is the difference or delta-T measurement.
This delta-T measurement is representative of the operating state
and relative capacity of the heat pump system. By measuring the
change in delta-T, we can determine the need for defrost. The coil
sensor also serves to sense outdoor coil temperature for termina-
tion of the defrost cycle.
FAULT IDENTIFICATION
A fault condition is indicated by the flashing light on the defrost
control inside the heat pump control box.
In normal operation, the defrost control light will flash once each
second. If the light is flashing more than once per second or not
at all, refer to the service manual for that unit.
PIN IDENTIFICATION (See Figure 6)
1. TEST_COMMON (Shorting any of the other pins to this pin
causes the function of the other pin to be executed. Leaving this
pin open results in the normal mode of operation.)
2. TST = Test (Shorting TEST_COMMON to this pin speeds
up all defrost board timings.)
3. FRC_DFT = Forced Defrost (Short TEST_COMMON to this
pin for two (2) seconds to initiate a forced defrost. Remove the
short after defrost initiates.)
DEFrOST CONTrOL ChECkOUT
Normal operation requires:
a LED on board flashing 1 time/second.
b. 24V AC between R & B
c. 24V AC between Y & B with unit operating
d. Defrost initiation when FRC_DFT pin is shorted to
TEST_COMMON pin.
MAX. WIRE LENGTH
150 FT
225 FT.
300 FT.
Pub. No. 11-BC08D1-7