Carrier 38AC - Manual

Carrier
Start-Ito cmd
Senrìce Instructions
5 ü
Heat Pump - Outdoor Unit
Table 1 — Physical Data
UNIT 38ЛС ___ _ ___,
OPERAJJNG WЕЮH]!,(I
REFRIGERANT
Ope rating Charge (lb)*
’ comp ' ressor '''^"
Model
Cyl inders
Oil (pts)
Crankcase Heater (watts)
O utdoor FANS
Number 2 3
Rpm; 60-Hertz 1 120 1 120
Diameter (in.) 22 22
Motor hp кз %
13,000
OUTDOOR COIL
____ __
Plate Fins;
о D
13 Per Incl
Face Area (sq ft)
Capacity (lb)t ^
PRESSURESTAT
(Cut-in (psig)
Low
(Cut-in (pstg)
Liquid Line
Cutout (psig)
Cut-in (psig)
T hermostat ^
Defrost
(Closes (F)
n- u I- jOpens (F)
Discharge
Fan Cycling
No. (F)
012 .....
890 ____ _
500 '
_36
_
Recip Herme
06DA337
6
10
_ 75 ^
Propel I
016
'~oig
22
45
; 1750 Rpm
06DA537
6
10
75 ^
Direct Drive
3-Rc
18 4
32
320
245
17
42
26 2
51
364
264
29
54
N.. 3 lÿ'"- <■=>
oses (F)
lens (F)
oses (F)
5
15_^
65+3
45 + 3
272
178
60
65
70
75
57
62
*Approximate charge with 25 feet of interconnecting piping
Use appropriate charging charts for actual charging of unit
tRefrigerant storage capacity at 120 F condensing temperature
with condenser 80 percent full of liquid
INITIAL START-UP
Evacuate and Dehydrate the entire refrigerant
system by either of the methods described in
Carrier Standard Service Techniques Manual.
Leak Test entire refrigerant system by Pressure
Method described in Carrier Standard Service
Techniques Manual. Use refrigerant specified for
unit at approximately 25 psig backed up with an
inert gas to a total pressure not to exceed 250 psig.
Before Starting Unit, check the following:
1. Compressor oil level must be at least within
sight in compressor oil sight glass. Add oil if
necessary.
2. Compressor hold-down bolts must be snug but
not tight. Refer to installation instructions or
tag on compressor foot.
3. All internal wiring connections must be tight;
all barriers and covers must be in place.
4. Electrical power source must agree with unit
nameplate rating.
5. All service valves must be open.
6. Fan cycling thermostat (head pressure control)
sensing bulb must be in air flow under fan no. 1.
7. Crankcase heater must be firmly locked into
compressor crankcase.
Energize Branch Circuit — Close field disconnect
switch to energize compressor crankcase heater.
Make sure room thermostat is set in a manner to
prevent unit(s) from starting at this time.
Heating/Cooling Thermostat (HH03AT064) has an
adjustable heat anticipator for both first- and
second-stage heating circuits.
SETTINGS — Set adjustment lever for first-stage
anticipator at 0.24 (left-hand side). Set adjustment
lever for second-stage anticipator (right-hand side)
as follows:
One Strip Heater - 0.21
Two Strip Heaters — 0.42
Three Strip Heaters — 0.63
Outdoor Thermostat — Refer to 40RT strip heater
Installation Instructions for details on adjustments
of this thermostat (if used).
To Start Unit — After compressor crankcase heater
has been on for at least 3 hours set room
thermostat so unit will start on desired cycle.
On initial start of 38AC016, unit should be run
for 20 minutes on heating cycle so any con­
taminants will be collected in larger drier.
HEATING — Place thermostat selector to “Heat”
and set temperature selector above room ambient.
COOLING — Place thermostat selector to “Cool”
and set temperature selector below room ambient.
To Charge System — Refer to Carrier Standard
Service Techniques Manual, Chapter 1, for charging
methods and procedures mentioned below. Refer
to charging charts as applicable.
1. Be sure to use the correct refrigerant (see
charging chart).
2. Regulate refrigerant drum valve to maintain
suction pressure at 49 psig on 38AC012 and 80
psig on 38AC016 while charging.
©Carrier Corporation 1969 Form 38AC-2SS