Carrier 38AE User Manual

HEATING & COOLING

38AE

012,014,016 Air-Cooled Condensing Units

Installation, Start-Up and Service Instructions

50 and 60 Hz

INSTALLATION

Step 1 — Complete Pre-Installation Checks

UNCRATE UNIT — Remove unit packaging except for the top skid assembly, which should be left in place until after the unit is rigged into place.

INSPECT SHIPMENT — File claim with shipping com­ pany if shipment is damaged or incomplete.

CONSIDER SYSTEM REQUIREMENTS

•Consult local building codes and National Electrical Code (NEC, U.S.A.) for special installation requirements.

•Allow sufficient space for airflow clearance, wiring, re­ frigerant piping, and servicing unit. See Fig. 1. See Fig. 2 for unit component locations.

•Locate unit so that outdoor coil (condenser) airflow is unrestricted on all sides and above.

•Unit may be mounted on a level pad directly on the base channels or mounted on raised pads at support points. See Table 2 for weight distribution based on recom­ mended support points.

NOTE: If vibration isolators are required for a particular installation, use the data in Table 2 to make the proper selection.

LEGEND

A — 1V4 in. (32) diam. knockout for %-in. (16) ODM liquid line connection

B — 1%in (44 5)diam knockout for 1’/a in (28 6) (38AE012); 1%in (35) suction line connection (38AE014,016) C — %-in (22.2) diam knockout for control power

D — 2-in (50 8) diam knockout for unit power

Certified dimension drawings are available on request.

NOTES:

1SERVICE AREAS - Allow 3 ft (914) on both sides and 2 ft (610) on both ends of unif for

servicing

Dimensions in parentheses are in (mm)

Fig. 1 - Physical Data and Dimensions (ft-in.)

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book|1 |1	PC 111	Catalog No 533-816 Printed in U S.A.	Form 38AE-17SI	Pg 1	4-92 Replaces: 38AE-10SI
Tab 3a 2a

Table 1 — Physical Datrf^

ENGLISH

UNIT 38AE	012	014		016
OPERATING WEIGHT (lb)	732	779		789
REFRIGERANT (lb)‘		22
COMPRESSOR	Reciprocating, Hermetic, 6 Cylinder;
		1750 Rpm
Model No.	06DD824 1 06DD328 I 06DD537
Oil (pt)		10
Crankcase Heater Watts		75
Unloader Setting (pslg)		70 ± 1
Load
Unload		60 ± 2
OUTDOOR-AIR FANS	Axial Flow, Direct Drive
No. ...Rpm		2 1075
Diameter (in.)		24
Motor Hp		V2
Nominal Cfm Total		8800
OUTDOOR COIL		29.2
Face Area (sq ft)	27 2			39 8
Storage Capacity (lb)t		40.3
CONTROLS
Pressurestat Settings (pslg)
High Cutout		395 ± 10
Cut-in		295 ± 10
Low Cutout		29 ± 4
Cut-in
FUSIBLE PLUG		200 F

NEMA — National Electrical Manufacturing Association

‘Unit is factory supplied with holding charge only.

tStorage capacity is measured at liquid saturated temperatures of 125 F for 38AE012; 123 F for 38AE014; and 130 F for 38AE016

SI

UNIT 38AE	012		014		016
OPERATING WEIGHT (kg)	333		354		359
REFRIGERANT (kg)*		10
COMPRESSOR	Reciprocating, Hermetic, 6 Cylinder;
			29.2 Rps
Model No.	06DD824 1 06DD328 | 06DD537
Oil (L)		4.73
Crankcase Heater Watts		75
Unloader Setting (kPa)		483 ± 6 9
Load
Unload		414 ±13 8
OUTDOOR-AIR FANS		Axial Flow, Direct Drive
No. ...Rps		2...17.9
Diameter (mm)		610
Motor Hp		1/2
Nominal L/s Total		4153
OUTDOOR COIL		2.71
Face Area (sq m)	124				18.1
Storage Capacity (kg)f		183
CONTROLS
Pressurestat Settings (kPa)
High Cutout		2724 ± 68 9
Cut-in		2034 ± 68 9
Low Cutout		200 ± 27.6
Cut-in		103
		414 ± 0
FUSIBLE PLUG			93 3 C

NEMA — National Electrical Manufacturing Association

‘Unit is factory supplied with holding charge only

tStorage capacity is measured at liquid saturated temperatures of 51 7 C for 38AE012; 50 6 C for 38AE014; and 54 4 C for 38AE016

LEGEND

1 -	Low-Voltage Fuse	5	— No. 2 Fan	9	— Hot Gas Bypass Piping Stub (%-in ODM)
2 -	No. 1 Fan	6	— Terminai Biock 1 (Unit Power)	10	— Low-Pressure Switch
3 -	High-Pressure Switch	7	— Terminal Block 2 (Control Power)	11	— Compressor
4 -	Circuit Breakers	8	— Muffler	12	— Wraparound Coil

Fig. 2 — Component Locations

Table 2 — Weight Distribution

	UNIT			WEIGHT - lb (kg)
		Oper			Support Point
	38AE
r		Wt	A		B	C	D
	012	732 (333)	142 (65)		138 (63)	225 (102)	227(103)
	014	779 (354)	143 (65)		140 (64)	247 (112)	249 (113)
	016	789 (359)	143 (65)		143 (65)	250 (114)	253 (115)

COIL

TOP VIEW

INSTALL FILTER DRIER(S) AND MOISTURE INDICATOR(S) — Every unit should have a filter drier and liquidmoisture indicator (sight glass). In some applications, de­ pending on space and convenience requirements, it may be desirable to install 2 filter driers and sight glasses. One fil­ ter drier and sight glass may be installed at A locations in Fig. 3. Or, 2 filter driers and sight glasses may be installed at B locations.

Select the filter drier for maximum unit capacity and min­ imum pressure drop. Complete the refrigerant piping from indoor unit to outdoor unit before opening the liquid and suction lines at the outdoor unit.

Step 2 — Rig and Mount the Unit

A CAUTION

Be sure unit panels are securely in place prior to rigging.

RIGGING — These units are designed for overhead rig­ ging only. For this purpose, the transverse base channels extend beyond the sides of the unit, with holes provided in end plates to attach cables or hooks. Rig with top skid pack­ aging assembly in place to prevent unit damage by the rig­ ging cable. As further protection for the coil faces, plywood sheets may be placed against the sides of the unit, behind the cables. Run the cables to a central suspension point so that the angle from the horizontal is not less than 45 de­ grees. Raise and set the unit down carefully.

If it is necessary to roll the unit into position, mount the unit on longitudinal rails, using a minimum of 3 rollers. Apply force to the rails, not the unit. If the unit is to be skidded into position, place it on a large pad and drag it by the pad. Do not apply any force to the unit.

Raise from above to lift unit from the rails or pad when unit is in final position.

COMPRESSOR MOUNTING — As shipped, the compres­ sor is held tightly in place by self-locking bolts. Before starting unit, loosen self-locking boits until the flanged washer is stiil snug but can be moved side­ ways with finger pressure. Do not remove ship­ ping bolts.

Step 3 — Complete Refrigerant Piping

Connections

SIZE REFRIGERANT LINES - Consider the length of piping required between outdoor unit and indoor unit (evap­ orator), the amount of liquid lift, and compressor oil re­ turn. See Table 3 and also refer to Part 3 of Carrier System Design Manual for design details and line sizing. Refer to indoor installation instructions for additional information.

Table 3 - Liquid Line Data

		MAX		LIQUID LINE
	UNIT	ALLOW.	Max Allow.	Max Allow.	Filter Drier and
		LIQUID		Temp	Sight Glass
	38AE
		LIFT	Press. Drop	Loss	Flare Conn.*
		ft(m)	psig (kPa)	•F (”C)	in. (mm)
	012	52 (15 8)	7 (48.3)	2(1 1)	%
	014	67 (20.4)	7 (48 3)	2(1 1)	Ye
	016	82 (25)	7 (48 3)	2(1 1)	Ys

*lnlet and outlet.

NOTE: Figures shown are for units operating at 45 F (7.2 C) saturated suction and 95 F (35 C) entering air

Fig. 3 Locations of Sight Glass(es)

and Filter Drier(s)

INSTALL LIQUID LINE SOLENOID VALVE - SOLE­ NOID DROP — It is recommended that a solenoid valve be placed in the main liquid line (see Fig. 3) between con­ densing unit (38AE) and fan coil (40RR, 40RE). This valve prevents refrigerant migration (which causes oil dilution) to the compressor during the off cycle at low outdoor ambient temperatures. The solenoid should be wired in parallel with the compressor contactor coil. This means of electrical con­ trol is referred to as solenoid drop control.

INSTALL LIQUID LINE SOLENOID VALVE (OP­ TIONAL) - CAPACITY CONTROL - If 2-step cooling is desired, place a solenoid valve in the location shown in Fig. 3.

DO NOT USE A RECEIVER — No receiver is provided with the unit. It is recommended that one NOT be used.

MAKE PIPING CONNECTIONS - Do not remove plas­ tic dust plugs from suction and liquid line stubs in the com­ pressor compartment until piping connections are ready to be made. Pass nitrogen or other inert gas through piping while brazing to prevent formation of copper oxide.

Install field-supplied thermostatic expansion valve(s) to indoor section. If 2 thermostatic expansion valves are in­ stalled for 2-step cooling, install field-supplied liquid line solenoid valve ahead of the second expansion valve.

PROVIDE SAFETY RELIEF — A fusible plug is located on the compressor crankcase (Fig. 4). Do not cap this plug. If local code requires additional safety devices, install them as directed.

FUSIBLE PLUG

TERMINAL BOARD (JB^) IN 38AE CONTROL BOX

I DISCONNECT PER NEC, USA. |

I_______________________________I

LEGEND

EQUIP GND — Equipment Ground

NEC — National Electrical Code

---------- Field Wiring

Fig. 5 - Main Power Supply Wiring

Step 4 - Complete Electrical Connections

POWER WIRING — Unit is factory wired for voltage shown on nameplate. Provide adequate fused disconnect switch within sight from unit and readily accessible from unit, but out of the reach of children. Lock switch open (off) to prevent power from being turned on while unit is being serviced. Disconnect switch, fuses, and field wiring must comply with national and local code requirements.

Route power wires through opening in unit end panel to connection in unit control box as shown on unit label dia­ gram and Fig. 5. Unit must be grounded.

Affix crankcase heater warning sticker to unit disconnect switch.

CONTROL CIRCUIT WIRING - Control voltage is 24 v. See Fig. 6 and unit label diagram for field-supplied wiring details. Route control wires through opening in unit end panel to connection in unit control box.

TERMINAL BOARD (TB2) IN 38AE CONTROL BOX

L2

R2

		LEGEND
C	-	Compressor Contactor
HD		Heating Device
IFC	-	Indoor-Fan Contactor
LLSV	- Liquid Line Solenoid Valve
R -		Relay

---------- Field Wiring

----------- Factory Wiring

NOTES:

1.Combination LLSV plus IFC va should not exceed 30 va.

2.Do not exceed 5 va (24 vac) per coil.

3. If va values shown in Notes 1 and 2 must be exceeded,	use
accessory relay transformer package 38AE900001.

Fig. 6 “ Remote Thermostat Wiring