49
MOTOR
FAN GRILLE
MOTOR SHAFT
A
A08505
MAX DISTANCE BETWEEN TOP OF FAN GRILLE AND BOTTOM OF FAN BLADE
SIZE
“A”
IN.
MM
24
6.3
160
30
6.3
160
36
7.6
193
42
7.6
193
48
7.6
193
60
7.6
193
Fig. 23 -- Fan Blade Position
Gas Input
The gas input does not require checking unless improper heating
performance is suspected. If a problem exists, refer to the Start--Up
section.
Evaporator Airflow
The heating and/or cooling airflow does not require checking
unless improper performance is suspected. If a problem exists, be
sure that all supply-- and return--air grilles are open and free from
obstructions, and that the air filter is clean. When necessary, refer to
the Indoor Airflow and Airflow Adjustments section to check the
system airflow.
Defrost Thermostat
The defrost thermostat is usually located on the lowest liquid
leaving circuit of the left (See Fig. 24). The thermostat closes at
32
_
F (O
_
C) and opens at 65
_
F (18
_
C)
The defrost thermostat signals heat pump that conditions are right
for defrost or that conditions have changed to terminate defrost. It
is a thermally actuated switch clamped to outdoor coil to sense its
temperature. Normal temperature range is closed at 32
_
3
_
F (0
1.7
_
C) and open at 65
_
5
_
F (18
2.8
_
C).
FEEDER TUBE
STUB TUBE
DEFROST
THERMOSTAT
C99029
Fig. 24 -- Defrost Thermostat Location
Puron Items
Metering Device
(Thermostatic Expansion Valve &
Piston)
This unit uses both a hard shutoff, balance port TXV in the indoor
coil and a piston in each side of the outdoor coil. The TXV
maintains a constant superheat at the evaporator coil exit (cooling
mode) resulting in higher overall system efficiency.
Pressure Switches
Pressure switches are protective devices wired into control circuit
(low voltage). They shut off compressor if abnormally high or low
pressures are present in the refrigeration circuit. These pressure
switches are specifically designed to operate with Puron (R--410A)
systems. R--22 pressure switches must not be used as replacements
for the Puron (R--410A) system.
Loss of Charge Switch
This switch is located on the liquid line and protects against low
suction pressures caused by such events as loss of charge, low
airflow across indoor coil, dirty filters, etc. It opens on a pressure
drop at about 20 psig. If system pressure is above this, switch
should be closed. To check switch:
1. Turn off all power to unit.
2. Disconnect leads on switch.
3. Apply ohm meter leads across switch. You should have
continuity on a good switch.
NOTE
:
Because these switches are attached to refrigeration
system under pressure, it is not advisable to remove this device for
troubleshooting unless you are reasonably certain that a problem
exists. If switch must be removed, remove and recover all system
charge so that pressure gauges read 0 psig. Never open system
without breaking vacuum with dry nitrogen.
High--Pressure Switch
The high--pressure switch is located in the discharge line and
protects against excessive condenser coil pressure. It opens at 650
psig.
48V
R
--
A
Summary of Contents for Performance 15 48VR-A
Page 5: ...5 A13167 Fig 3 48VR A24 30 Unit Dimensions 48VR A ...
Page 6: ...6 A13168 Fig 4 48VR A36 60 Unit Dimensions 48VR A ...
Page 19: ...19 A13153 Fig 14 208 230 1 60 Connection Wiring Diagram Gas Inputs 40 60 90 KBtu hr 48VR A ...
Page 20: ...20 A13154 Fig 15 Cont 208 230 1 60 Ladder Wiring Diagram Gas Inputs 40 60 90 KBtu hr 48VR A ...
Page 21: ...21 A13155 Fig 15 208 230 1 60 Connection Wiring Diagram Gas Inputs 115 130 KBtu hr 48VR A ...
Page 22: ...22 A13156 Fig 16 Cont 208 230 1 60 Ladder Wiring Diagram Gas Inputs 115 130 KBtu hr 48VR A ...
Page 23: ...23 A13157 Fig 16 208 230 3 60 Connection Wiring Diagram Gas Inputs 40 60 90 KBtu hr 48VR A ...
Page 24: ...24 A13158 Fig 17 Cont 208 230 3 60 Ladder Wiring Diagram Gas Inputs 40 60 90 KBtu hr 48VR A ...
Page 25: ...25 A13159 Fig 17 208 230 3 60 Connection Wiring Diagram Gas Inputs 115 130 48VR A ...
Page 26: ...26 A13160 Fig 18 Cont 208 230 3 60 Ladder Wiring Diagram Gas Inputs 115 130 48VR A ...