70
XC25
TO LIQUID
LINE SERVICE
VALVE
TEMPERATURE
SENSOR
DIGITAL SCALE
REFRIGERANT TANK
TEMPERATURE SENSOR
(LIQUID LINE)
MANIFOLD GAUGE SET
A.
CLOSE MANIFOLD GAUGE SET VALVES AND CONNECT THE CENTER HOSE TO A CYLINDER OF HFC-410A SET FOR LIQUID PHASE CHARGING.
B.
CONNECT THE MANIFOLD GAUGE SET'S LOW PRESSURE SIDE TO THE TRUE SUCTION PORT.
C.
CONNECT THE MANIFOLD GAUGE SET'S HIGH PRESSURE SIDE TO THE LIQUID LINE SERVICE PORT.
D.
POSITION TEMPERATURE SENSOR ON LIQUID LINE NEAR LIQUID LINE SERVICE PORT.
OUTDOOR UNIT
CHARGE IN
LIQUID PHASE
CONNECTIONS FOR TESTING AND CHARGING
GAUGE SET
A
C
D
LOW
HIGH
B
INSIDE OUTDOOR UNIT
TRUE SUCTION PORT
CONNECTION
Figure 55. Gauge Set Connections
Cº
T
DROP
–
D
T
=
ºF
ACTION
53º
19
–
15
=
4
INCREASE THE AIRFLOW
58º
14
–
15
=
-1
(3º RANGE) NO CHANGE
62º
10
–
15
=
-5
DECREASE THE AIRFLOW
D
T
80
24 24 24 23 23 22 22 22 20 19 18 17 16 15
78
23 23 23 22 22 21 21 20 19 18 17 16 15 14
76
22 22 22 21 21 20 19 19 18 17 16 15 14 13
74
21 21 21 20 19 19 18 17 16 16 15 14 13 12
72
20 20 19 18 17 17 16 15 15 14 13 12 11 10
70
19 19 18 18 17 17 16 15 15 14 13 12 11 10
57 58 59 60 61 62 63 64 65 66 67 68 69 70
TEMPERATURE OF AIR
ENTERING INDOOR COIL ºF
INDOOR
COIL
DRY BULB
DRY
BULB
WET
BULB
B
T
DROP
19º
A
DR
Y-BULB
WET-BULB ºF
A
72º
B
64º
C
53º
AIR
FLOW
AIR
FLOW
ALL TEMPERATURES ARE
EXPRESSED IN ºF
1. DETERMINE THE DESIRED DT — MEASURE ENTERING AIR
TEMPERATURE USING DRY BULB (
A
) AND WET BULB (
B
).
D
T
IS THE INTERSECTING VALUE OF
A
AND
B
IN THE
TABLE (SEE TRIANGLE).
2.
FIND TEMPERATURE DROP ACROSS COIL
— MEASURE
THE DRY BULB AIR TEMPERATURE ENTERING AND LEAV
ING THE COIL (
A
AND
C
). TEMPERATURE DROP FORMULA:
(
T
DROP
) =
A
MINUS
C
.
3. DETERMINE IF FAN NEEDS ADJUSTMENT — IF THE DIF
FERENCE BETWEEN THE MEASURED
T
DROP
AND THE DE
SIRED
D
T
(T
DROP
–
D
T)
IS 3º, NO ADJUSTMENT IS
NEEDED. SEE EXAMPLE AT LEFT:
4.
ADJUST THE FAN SPEED
— SEE INDOOR UNIT INSTRUC
TIONS TO INCREASE/DECREASE FAN SPEED.
ASSUME
D
T
= 15 AND
A
TEMP. = 72º, BELOW
C
TEMPERATURES REQUIRE ACTION:
AIRFLOW
INDOOR COIL
NOTE - CHANGING AIR FLOW AFFECTS ALL TEMPERA
TURES; RECHECK TEMPERATURES TO CONFIRM THAT THE
TEMPERATURE DROP AND
D
T ARE 3º.
Figure 56. Checking Indoor Airflow over Evaporator Coil using Delta-T Chart
Содержание XC25-024-230-01
Страница 43: ...43 XC25 Figure 24 Typical Unit Wiring XC25 048 and 060...
Страница 72: ...72 XC25 Figure 59 XC25 Charging Sticker...
