Carrier 38AD034 - Physical Data and Time Guard Circuit Functions; Unit Physical Data Summary; Time Guard Circuit Operation

Table 9 — Physical Data
UNIT
38AD024
38AD028
! 38AD034
38AD044 38AB054
f 38AB064
38AB084
OPER WT (lb)
1750
1900
2300 ' 3200 3145 3830
4960
REFRIGERANT
R-22
Oper Chg (lb)*
28 0 |
1 30 5 j
| 35 5 j
; 66 0 1
57 0 |
| 71
0 J
132 0
COMPRESSOR
Reciprocating Hermetic — 1750 rpm
Number
1
1
1
1 2 !
I 2 ]
2
1 2
Model
06ED250 06EE266
06EE275 :
06EA
250
06ED
250
06EA
250
06EE.
275
06EA
275 1
06 EE
275
06EA
, 299
06EE
299
Cylinders
4
4
6
4 4
4
6
6
6
6
6
Oil (pt)
14
14 19
14
14
14
19
19
19
19
19
Crankcase Htr
125 Watts
Protection
Solid State & Ckt Bkr
Thermotector & Ckt Bkr
Solid State
& Ckt Bkr
Cap. Control
Suction Pressure Cylinder (Jnloader(s
)
No. 1
Unloader Settings (ps
ig)
Load
76 78 d
78
88
-
79
-
79
-
79
Unload
58
60 •;!
60 66
-
66
-
66
-
66
No. 2
Unloader Settings (psig)
Load
-
76 76
-
\
76
-
76
-
76
Unload
-
58 58
-
i
„_i
58
-
58
-
58
COND FANS
Axic il Flow;
Direct Drive
Number
3
3 $
3
3
6
i «
S 1
6
Rpm
1140 1140 iiij
1140
1140
1140
1140 1140
Diam (in.)
26 30 30
30
30
30 30
Motor Hp (ea)
%
1
1
1
1
1 1
Cfm
18,200
25,200 28,200 ; i :
' i
■ 31,000
50,400
j 56,400
S 62,000
COND COIL
Plate Fins; 3-rowt
Sections
1
1
1
l > l
2 i
! : 2 1
2
Face (sq ft) 35 4 39 0
49 6
60 4 78 0 |
99 2
120 8
Capacity (l b ) $
70 77
99
161
154
198 322
ELEC CONTROLS
Time Guard Circuit**
Pressurestat Du
al
... . Cutout
High r
Cut-in
375 Psig
275 Psig
. Cutout
Low
Cut-in
29 Psig
29 Psig 29 Psig
44 Psig
45 Psig
63 Psig
Pressurestat
Capacity Control
Cutout
-
_
57 Psig
57 Psig
Cut-in
- -
87 Psig
87 Psig
Pressurestat
Oi
1 Pressure Con fro 1
Cutout
5 Psi Above Suction Pressure
Thermostat
Fan Cycling
No. 1
Opens, 70 F; Closes, 75 F
No. 2
Opens, 57 F; Closes, 62 F
Thermostat
Opens
Discharge Line
, 290 F; Closes, 210 F
PRESS. RELIEF
F u s i b L
e Plug
DISCHARGE LINE
1 ]
1
2
2
2
2
CHECK VALVE
I
* Approximate charge for maximum system capacity Holding charge
factory supplied with all units
f Unit 38AD044 and 38AB084 have 4-row coi)
Time Guard Circuits
BASIC FUNCTIONS OF TIME GUARD CIRCUIT
on all units provide for normal (12 to 15 sec)
momentary delays after the thermostat closes and
before compressors) start. The circuit also pro¬
vides for a longer delay (4 min 45 sec to 5 min
30 sec) in the event of thermostat short cycling or
momentary power failure.
^Storage capacity at 120 F condensing temp with condenser 80%
full of liquid
**Short-cycJe protection
38AD024 THRU 044 UNITS
In addition to the basic functions, timers in
these units provide additional delays for oil
pressure switch bypass (40 sec), winter start
provision (150 sec) bypass of low-pressure switch
and part-winding start (1 sec), if used.
9
772