Carrier 38AC User Manual

Carrier

Start-Ito cmd

Senrìce Instructions

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Heat Pump - Outdoor Unit

Table 1 — Physical Data

'~oig

; 1750 Rpm

06DA537

Direct Drive

13 Per Incl

о D

5

15_^

65+3

272
178

016

22

45

6

10

75 ^

3

1 120

22

%

13,000

26 2

51

364
264

29

54

70
75
57
62

UNIT 38ЛС ___ _ ___,

OPERAJJNG WЕЮH]!,(I

REFRIGERANT

Ope rating Charge (lb)*

’comp'ressor'''^"

Model
Cyl inders
Oil (pts)
Crankcase Heater (watts)

Outdoor FANS

Number
Rpm; 60-Hertz 1 120
Diameter (in.) 22
Motor hp

OUTDOOR COIL

Face Area (sq ft)

Capacity (lb)t ^

PRESSURESTAT

(Cut-in (psig)

Low

(Cut-in (pstg)

Liquid Line

Cutout (psig)

Cut-in (psig)

Thermostat^

Defrost
n- u I- jOpens (F)

Discharge

Fan Cycling

*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

(Closes (F)

No. (F)

N.. 3 lÿ'"- <■=>

oses (F)

lens (F)

oses (F)

012.....

890 ____ _
500 '

_36 _

Recip Herme

06DA337

6

10

_ 75 ^
Propel I

2

кз

_

___

__

Plate Fins;

18 4

32

320

245

42

60
65

3-Rc

17

45 + 3

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

COOLING CYCLE

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Q.

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V)
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38AC012 with 40RT012 Indoor Unit

38AC016 with 40RT016 Indoor Unit

HEATING CYCLE

38AC012with 40RT012 Indoor Unit

‘Minimum cfm that will allow the unitsto operate at 80 F indoor return air and 65 F

operating efficiency of system and reduce operating costs

Fig. 1 - Charging Charts

38AC016 with 40RT016 I ndoor Unit

wb outdoor air on heating cycle. Higher air quantities increase

2