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Carrier 38YSA User Manual

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38YSA
Heat Pump Unit
Heating Check Chart
Fig. 1—38YSA024-048
A97121
REQUIRED SUBCOOLING
COOLING MODE
HEATING MODE
MODEL
SIZE
REQUIRED LIQUID LINE TEMPERATURE
Liquid pressure
at Service Valve
Required Subcooling Temperature (°F)
(PSIG)
0 5 10 15 20 25
FIELD CHARGING PROCEDURE
FOR HEATING ONLY
1. Defrost unit before checking charge. Outdoor coil must be
free of frost and/or ice.
2. Accumulator may momentarily hold refrigerant after defrost
cycle, therefore, allow 15 min. of normal operation following
defrost cycle before checking charge.
3. This outdoor unit is equipped with a thermal expansion
device, therefore, the subcooling chart on the left may be
used for checking purposes only.
Compressor damage may occur if system is over charged.
324003-101 REV. A
WARNING
134 76 71 66 61 56 51
141 79 74 69 64 59 54
148 82 77 72 67 62 57
156
85 80 75 70 65 60
163 88 83 78 73 68 63
171 91 86 81 76 71 66
179 94 89 84 79 74 69
187
97 92 87 82 77 72
196
100 95 90 85 80 75
205 103 98 93 88 83 78
214 106 101 96 91 86 81
223
109 104 99 94 89 84
233
112 107 102 97 92 87
243 115 110 105 100 95 90
253 118 113 108 103 98 93
264 121 116 111 106 101 96
274 124 119 114 109 104 99
285 127 122 117 112 107 102
297 130 125 120 115 110 105
309
133 128 123 118 113 108
S.C. °F
REQ’D
TEMP °F
OUTDOOR
S.C. °F
REQ’D
TEMP °F
OUTDOOR
CAUTION
(In cooling mode for indoor units equipped with a TXV)
70
80
95
95
80
70
95
80
70
95
80
70
95
80
70
20
40
60
20
40
60
20
40
60
20
40
60
20
40
60
024
030
036
042
048
1. Operate unit a minimum of (10) minutes before checking charge.
2. Refer to "Required Subcooling" table to find the required
subcooling temperature.
3. Measure pressure at the liquid line service valve gauge port
by using an accurate gauge.
4. Measure temperature of liquid line near outdoor coil, using an
accurate thermometer, either electronic or thermister type.
5. Using "Required Liquid Line Temperature" table find point where
required subcooling temperature intersects the measured liquid
service valve pressure to obtain the proper liquid line temperature.
6. To obtain the required liquid line temperature at the measured
liquid line pressure, add refrigerant if the liquid line temperature is
higher than indicated or remove if lower. Allow a tolerance of ±3°F.
This unit is factory charged with R-22. The amount is shown on
the rating plate. The charge is adequate for most systems using
a matched indoor coil and a line set not exceeding 15 feet in
length. See installation instructions for the use of a line set
length exceeding 15 feet.
The subcooling chart on the left may be used in the field for
checking refrigerant charge at off ARI conditions. For an
accurate charge, use the "weigh-in" method.
OPERATION
30
46
49
52
55
58
61
64
67
70
73
76
79
82
85
88
91
94
97
100
103
Service valve gauge port may not be equipped with Schrader
valve (valve core). To prevent personal injury, make sure valve
stem is back-seated (counterclockwise) before removing cap.
Wear safety glasses and gloves when handling refrigerant.
@ LIQUID SERVICE VALVE
723
624
625
429
333
335
613
616
518
815
718
718
820
724
724
Visit www.carrier.com
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Tab 5a 5a
PC 101 Catalog No. 513-847 Printed in U.S.A. Form 38YSA-2XA Pg 1 5-97 Replaces: 38YSA-1XA
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1 2

Summary of Contents

Page 1 - Heating Check Chart

38YSAHeat Pump UnitHeating Check ChartFig. 1—38YSA024-048A97121REQUIRED SUBCOOLINGCOOLING MODEHEATING MODEMODELSIZEREQUIRED LIQUID LINE TEMPERATURELiq

Page 2 - Tab 5a 5a

Copyright 1997 CARRIER Corp. • 7310 W. Morris St. • Indianapolis, IN 46231 38ysa2xaManufacturer reserves the right to discontinue, or change at any ti

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