EarthLinked ACM-1836B User manual

ACM-407CP-IM (11/12) Copyright 2012 Earthlinked Technologies, Inc
EarthLinked®
Auxiliary Cooling Module
Models ACM-1836B and ACM-4272B
for R-407C
Installation Manual
CONTENTS
PAGE
Pre-Installation
3
Installation
5
•
Placement
5
•
Refrigerant Connections
7
•
Electrical and Start-Up
9
•
Fan Speed Control
10

ACM-407CP-IM (11/12) Page 2
Disclaimer
The EarthLinked®Auxiliary Cooling Module is sold as a system component part and must be
properly sized and matched to the system compressor unit to provide the intended performance
and safe operation of the system. This component must be installed and serviced by a trained
technician who has successfully completed the ETI training class and passed the final examination.
Installation and service must be made in accordance with the instructions set forth within this
manual and the current EarthLinked®Heating and Cooling System Installation, Operation and
Maintenance Manual.
Failure to provide installation and service by an authorized, trained installer in a manner consistent
with this manual will void the limited warranty coverage for the EarthLinked® system.
EarthlinkedTechnologies shall not be liable for any defect, unsatisfactory performance, damage or
loss, whether direct or consequential, relative to the design, manufacture, construction, application
or installation of other components in the EarthLinked® system.
Earthlinked Technologies, Inc.
4151 South Pipkin Road
Lakeland, Florida 33811
tel. [phone] ● fax [phone]
[e-mail] ● www.earthlinked.com

ACM-407CP-IM (11/12) Page 3
Pre-Installation
EarthLinked®compressor units that provide space cooling shall be equipped with an
EarthLinked®Auxiliary Cooling Module when BOTH of the following circumstances occur:
•Ambient outdoor temperatures have exceeded the outdoor summer design
temperature conditions for at least 7 hours of continuous system run time, coupled
with the following conditions.
•Low thermal conductivity soils that do not effectively absorb and dissipate heat.
Examples of such soils are light dry soil, dry sand, peat and organic soils, dry clay
soils and hardpan.
This Auxiliary Cooling Module is sold as a system component and must be properly matched with
the compressor unit to provide the anticipated performance and safe operation of the system. The
table below lists the properly matched EarthLinked®Auxiliary Cooling Module models with
EarthLinked®compressor unit models.
Application of the Auxiliary Cooling Module (ACM) to EarthLinked®systems will require the
use of two (2) field supplied Type ACR copper couplings to match the ACM with the line set
vapor tube size. See the table below to determine the required coupling sizes.
Compressor
Unit Model
Auxiliary Cooling Module Vapor Line Set Size,
OD, in.
Model ACM - Connections
OD, In. R-407C
-018
1836B 7/8
5/8
-024 3/4
-030 3/4
-036 3/4
-042
4272B 1-1/8
7/8
-048 7/8
-060 1-1/8
-072 1-1/8
.

ACM-407CP-IM (11/12) Page 4
The dimensions data for the Auxiliary Cooling Module is shown in Figure 1.
Dimensions,
Inches
Connections
Tube, OD,
inches Sound,
dB(A)
Net
Weight,
Lbs
Coil
H W D Inlet Outlet Rows Fins/inch
Face Area,
Sq Ft
25-7/8 36 17-3/8 7/8 7/8 52.0 95 2 15 7.0
Fan Electrical
Type CFM RPM Dia., inches Power Fan HP Fan FLA Min Voltage
Swept 1,800 810 20 230-1-60 1/6 1.0 207
Figure 1. Auxiliary Cooling Module Dimensions and Data

ACM-407CP-IM (11/12) Page 5
Installation – Auxiliary Cooling Module Placement
The Auxiliary Cooling Module unit is placed as shown in Figure 2 relative to other components in
the EarthLinked®system. The Auxiliary Cooling Module is located outdoors and will be
connected to the refrigerant line set (vapor tube) outside the building.
Figure 2. Auxiliary Cooling Module Placement in EarthLinked®System
Location Requirements for the Auxiliary Cooling Module:
1. Within 40 Feet of the earth loop line set. Minimize refrigerant line lengths.
2. Higher than the compressor unit.
3. No more than 20 feet higher than the earth loop manifolds.
4. With proper clearances around the unit:
•24 inches minimum on the two sides and back (coil side)
•36 inches minimum on the front (fan side)

ACM-407CP-IM (11/12) Page 6
5. Away from windows, patios, decks, etc., where unit operation sounds may disturb the
occupants.
6. On a solid, level mounting pad. The mounting pad should extend a minimum of 2 inches
beyond the cabinet size of the Auxiliary Cooling Module. The minimum pad size is to be
22 inches by 46 inches. The pad should NOT be in contact with or be an integral part of
the building foundation. The following DiversiTech Pads (or their equivalent) are
recommended. The standard pads are 2inches thick. Local building codes may require a 3
inch thick pad.
Model Number Size,
Inches Comments
Ultralite®UC2448-2 24 x 48 x 2 fiber-cement construction
Ultralite®UC2448-3 24 x 48 x 3 fiber-cement construction
Elite®EL3648-2 36 x 48 x 2 Plastic-drillable for securing
unit
Elite®EL3648-3 36 x 48 x 3 Plastic-drillable for securing
unit
7. Where conditions or local codes require the Auxiliary Cooling Module to be attached to a
mounting pad or frame, tie down bolts should be used to fasten through the holes provided
in the Auxiliary Cooling Module feet.
8. Elevate the Auxiliary Cooling Module per local climate and code requirements to provide
clearance above estimated snowfall level and ensure adequate water drainage of Auxiliary
Cooling Module. Use snow stand in areas where prolonged freezing temperatures are
encountered.
Do NOT Locate the Auxiliary Cooling Module:
1. On brick, concrete blocks or unstable surfaces
2. Near clothes dryer exhaust vents
3. Near sleeping area or near windows
4. Under eaves where water, snow or ice can fall directly in the unit
5. Within clearance less than 2 Feet from a second unit
6. Within the minimum distance the Auxiliary Cooling Module can be installed from the
property line, where local zoning ordinances apply.

ACM-407CP-IM (11/12) Page 7
Installation – Refrigerant Connections
The Auxiliary Cooling Module has two refrigerant connections on the service side of the unit as
shown in Figure 1. The connections are the same size as each other. Each connection is identified
with a label saying “Compressor” or “Earth loops”. Check Figure 1 and the table on page 3 to
determine coupling sizes to match the line set vapor tube size.
The refrigerant connections have caps brazed on at the factory. They should be un-brazed at the
time that tubing is to be connected to the Auxiliary Cooling Module.
After locating the Auxiliary Cooling Module as noted earlier, a trench 3 to 4 Feet deep is to be
excavated running from the Auxiliary Cooling Module to the earth loop line set. If the lines to and
from the Auxiliary Cooling Module are to be run parallel to and within 10 Feet of the building
foundation or basement wall, both lines are to be insulated with ½” wall thickness Armaflex®or
InsulTube®tubing insulation, cased within a PVC pipe. The PVC pipe must be a minimum of 3 Feet
from the building foundation or wall. This is illustrated for a typical application in Figure 3.
Figure 3. Auxiliary Cooling Module Refrigerant Piping
A top view of typical Auxiliary Cooling Module and line set vapor line connections are illustrated in
Figure 4. For new installations of an EarthLinked system with an ACM, an alternate method to the
one shown in Figure 4 is to run a single piece vapor line from the compressor unit to the ACM and
another single piece vapor line from the ACM to the vapor manifold of the earth loop system.

ACM-407CP-IM (11/12) Page 8
Figure 4. Top View of Line Set Connections
All refrigerant piping joints and connections in the EarthLinked® heating and cooling system,
including the Auxiliary Cooling Module, line sets and earth loop system are to be brazed with
15% silver content brazing alloy, utilizing the NITROGEN BRAZING PROCESS.

ACM-407CP-IM (11/12) Page 9
Installation – Electrical and Start-Up
1. After turning “OFF” power to all EarthLinked®and field supplied system components at the
appropriate breakers remove the Auxiliary Cooling Module control box access panel.
2. Connect appropriately sized line voltage wires and ground wire to the Auxiliary Cooling
Module, as shown in Figure 5.
Figure 5. Auxiliary Cooling Module Field Wiring
3. The Auxiliary Cooling Module contains a pressure actuated fan speed control that has been
factory set for a pre-determined R-407C system condensing pressure.
4. Check all wiring and electrical connections to ensure proper routing and good
contact before restoring electric power, evacuating and recharging system in accordance
with the current EarthLinked®system installation manual.

ACM-407CP-IM (11/12) Page 10
Installation - Fan Speed Control
The Auxiliary Cooling Module (ACM) is equipped with a variable fan speed control that varies the
speed of the fan as a direct function of the system condensing pressure. When the system is
operating in cooling mode and the compressor unit turns on, the Auxiliary Cooling Module fan
speed will increase as condensing pressure increases. The fan will reach full speed at the factory-
set condensing pressure.
The system pressure setting and associated condensing temperature for full speed fan has been
factory-set and is shown in Figure 6.
Factory Setting for
Full Speed Fan Field Adjustment Guide
Condensing
Pressure,
psig
Condensing
Temperature,
ºF
Setting Screw
Rotation Condensing Pressure
Change, psig
Condensing
Temperature
Change,
ºF
350 132 ¼ Turn 12 2.7
Figure 6. R-407C Condensing Pressure and Temperature Information
If it is necessary to adjust the full speed fan pressure setting in the field, the Auxiliary Cooling
Module pressure control may be adjusted by accessing it through the ACM control panel cover.
With the control panel cover removed, the pressure control will appear as it does in the left view of
Figure 7. After removing the sealing plug, the 5/64” Allen key is inserted into the setting screw to
adjust the pressure level and associated condensing temperature for full speed fan operation.
Figure 6 indicates the change in full speed fan pressure and condensing temperature for each
¼ turn of the setting screw.
CLOCKWISE rotation of the setting screw INCREASES full speed fan pressure and condensing
temperature.
COUNTER-CLOCKWISE rotation of the setting screw REDUCES full speed fan pressure and
condensing temperature.

ACM-407CP-IM (11/12) Page 11
Figure 7. Field Adjustment Procedure
After adjustment has been made, install the sealing plug and replace and fasten the control panel
cover prior to restoring power to the Auxiliary Cooling Module.
The Auxiliary Cooling Module does not operate in heating mode.