Bard CHDM User manual

Manual 2100-506
Page 1 of 14
INSTALLATION INSTRUCTIONS
DEHUMIDIFIER
MODEL CHDM
for use with
CH3S1
CH4S1
CH5S1
Manual : 2100-506
Supersedes: NEW
File: Volume III Tab 17
Date: 03-27-08
Bard Manufacturing Company, Inc.
Bryan, Ohio 43506
Since 1914...Moving ahead just as planned.
© Copyright 2008

Manual 2100-506
Page 2 of 14
CONTENTS
Tables
Table 1 CH Dehumidifier Performance .............. 6
Table 2 System Refrigerant Pressure ................ 7
Figures
Figure 1 Wiring Diagram .................................... 8
Figure 2 Wiring Connection High & Low Voltage ... 9
Figure 3 Supply Duct ....................................... 10
Figure 4 Basic Installation ................................ 11
Cabinet & Functional Components
Exploded View .................................................... 12
Parts List ............................................................ 13
Exploded View .................................................... 14
Parts List ............................................................ 14
Getting Other Information and Publications
For More Information ............................................... 3
Wall Mount General
Description ............................................................ 4
Shipping Damage ................................................. 4
General .............................................................. 4
Installation....................................................... 4 & 5
Sequence of Operation ......................................... 5
High Pressure Switch & Lockout Sequence ......... 5
Low Pressure Switch Bypass & Lockout Sequence ... 5
Pressure Service Ports ......................................... 5

Manual 2100-506
Page 3 of 14
Getting Other Information and Publications
These publications can help you install the air
conditioner or heat pump. You can usually find these at
your local library or purchase them directly from the
publisher. Be sure to consult current edition of each
standard.
National Electrical Code ...................... ANSI/NFPA 70
Standard for the Installation .............. ANSI/NFPA 90A
of Air Conditioning and Ventilating Systems
Standard for Warm Air ...................... ANSI/NFPA 90B
Heating and Air Conditioning Systems
Load Calculation for ............................ ACCA Manual J
Residential Winter and Summer Air Conditioning
Duct Design for Residential .............. ACCA Manual D
Winter and Summer Air Conditioning and Equipment
Selection
FOR MORE INFORMATION, CONTACT
THESE PUBLISHERS:
ACCA Air Conditioning Contractors of America
1712 New Hampshire Ave. N.W.
Washington, DC 20009
Telephone: [phone]
Fax: [phone]
ANSI American National Standards Institute
11 West Street, 13th Floor
New York, NY 10036
Telephone: [phone]
Fax: [phone]
ASHRAE American Society of Heating, Refrigerating,
and Air Conditioning Engineers, Inc.
1791 Tullie Circle, N.E.
Atlanta, GA 30329-2305
Telephone: [phone]
Fax: [phone]
NFPA National Fire Protection Association
Batterymarch Park
P.O. Box 9101
Quincy, MA 02269-9901
Telephone: [phone]
Fax: [phone]

Manual 2100-506
Page 4 of 14
DESCRIPTION
The CHDM dehumidifier is designed to be used with
Bard 3 through 5 ton CH heat pump models. It will be
installed in the outdoor section of the CH unit. The
dehumidifier incorporates a complete refrigeration
system. It will share the high & low voltage control
from the CH control panel. The CHDM is for use in
CH*S Series units with or without CHERV or CHCRV.
The CHDM cannot be used in units equipped with
economizers CHEIFM.
SHIPPING DAMAGE
If a shipment is damaged or the piece count does not
agree with the quantity shown on the freight bill, the
buyer/receiver should make note on all copies of the
freight company’s delivery receipt of any damages and/
or shortages at the time of delivery. The receiving agent
and the freight company’s agent should both sign the
delivery receipt and the bill of lading. It is preferred,
that both signatures are obtained at the time of delivery.
If at all possible at the time of delivery, photograph the
noted damages as evidence to support a freight claim.
The damage and/or shortage notation on the delivery
receipt does not constitute a claim. It is the recipient’s
responsibility to initiate the claim process by requesting
an inspection and requesting a claim number from the
freight carrier. Save all noted freight bills, bills of
lading, delivery receipts, packing sheets and invoices for
documentation that will be required to support an
itemized claim.
For concealed damage you must immediately notify the
delivering freight carrier by phone and request an
inspection. Many freight carriers will not honor concealed
damage claim beyond 48 hours from the time of delivery
or if the product has been moved to another location other
than the ship to address. Most freight carriers will
challenge claims written after a two-week period.
GENERAL
The CH Dehumidifier equipment covered in this manual
should be installed by trained, experienced service and
installation technicians.
IMPORTANT
Make sure cabinet insulation does not tear!
While these instructions are intended as a general
recommended guide, they do not supersede any national
and/or local codes in any way and are not intended as a
step-by-step procedure with which the mechanically
inclined owner can install the package. See Page 3 for
information on codes and standards.
The dehumidifier is shipped in one carton and contains
the electrical harness, miscellaneous hardware and
installation instructions. Where local regulations are at
a variance with instructions, installer should adhere to
local codes.
INSTALLATION
DEHUMIDIFIER: Unpack the dehumidifier. Set
aside the sheet metal duct for now. Facing the outdoor
section of the CH model, on the right-hand side, there is
a long, narrow access panel. Remove this panel and set
aside. (See Page 11, Figure 4.)
Remove the fill plate located in the bottom of this
compartment by unscrewing the four screws. Remove
the 1½" knockout and clear the insulation hole. Place
fill plate back in the unit. With a marker, trace the 1½"
hole onto the screen below. Remove the fill plate again
and cut out marked hole. Place fill plate back into unit
and reattach with four screws.
Place the dehumidifier in this opening by placing the
wedge end of the cabinet in first and slide all the way
back (see Figure 4).
WIRING: Remove the knockout in the back of the CH
control panel and insert bushing (see Figure 2). Route
high and low voltage wires into the CH control panel
through the bushing. Connect per Figures 1 & 2.
Connect a humidistat (field-supplied) per the low
voltage connection diagram in the CH Literature.
WARNING
Open and lock unit disconnect switch before
installing this accessory to prevent injury or
death due to electrical shock or contact with
moving parts. Turn thermostat to OFF.

Manual 2100-506
Page 5 of 14
DRAIN: Connect a drain trap to the drain fitting under
the bottom of the dehumidifier section of the unit. The
drain connection is a ¾" female pipe fitting. The use of
a trap is required to ensure proper drainage.
AIR CHANNEL ASSEMBLY: (See Figure 3.)
Remove cover plate in unit and cut out the insulation.
On CH3S1 models, the duct extension is to be removed
and a new piece of foam (supplied) added to the bottom
of the air channel assembly. Slide the air channel
assembly into the unit and position the assembly to the
left until the angle hits the side of the inner back.
Secure the angle with three self-drilling screws. Secure
the top with one screw.
SEQUENCE OF OPERATION
Dehumidification – Circuit DH makes at the humidistat
pulling in the compressor contactor, starting the
compressor and the dehumidifier blower motor. The
“G” (indoor motor) is automatically completed on call
for dehumidification (Relay #2).
The dehumidifier may operate alone or run
simultaneously with the first stage of the CH unit. When
the CH unit switches to second stage, the operation of the
dehumidifier will be locked out (Relay #1).
The Compressor Control Module is an anti-short cycle/
lockout timer with high and low pressure switch
monitoring.
On initial power up or any time power is interrupted to
the unit, the delay on make period begins, which will be
two minutes. When the delay on make is complete and
the high pressure and low pressure are closed, the
compressor contactor is energized. Upon shutdown, the
delay or break timer starts and prevents restart until the
delay on break and delay on make have expired.
During routine operation of the unit with no power
interruption, the compressor will operate on demand
with no delay.
HIGH PRESSURE SWITCH AND
LOCKOUT SEQUENCE
If the high pressure switch opens, the compressor
contactor will de-energize immediately. The lockout
timer will go into a soft lockout and stay in soft lockout
until the high pressure switch closes and the delay on
break time has expired. If the high pressure switch
opens again in the same operating cycle, the unit will go
into manual lockout. Recycling the wall humidistat
resets the manual lockout.
LOW PRESSURE SWITCH
BYPASS & LOCKOUT SEQUENCE
If the low pressure switch opens for more than 120
seconds, the compressor contactor will de-energize and
go into a soft lockout. Regardless the state of the low
pressure switch, the contactor will re-energize after the
delay on make time delay has expired. If the low
pressure switch remains open longer than 120 seconds,
the unit will go into manual lockout. Recycling the wall
humidistat resets the manual lockout.
NOTE: Both high and low pressure switch controls are
inherently automatic reset devices. The high pressure
and the low pressure switch cut out and cut in settings
are fixed. The lockout features, both soft and manual,
are a function of the compressor control module.
FREEZE STAT OPERATION: The freeze stat
operation will open at 32° and de-energize the
compressor and fan. The compressor and fan will restart
after the coil defrosts and the freeze stat warms to 57°.
PRESSURE SERVICE PORTS
High and low pressure service ports are installed on the
unit, so the system operating pressures can be observed.
To gain access to these pressure ports, remove the long
narrow panel on the right-hand side of the outdoor
section of the CH unit. See Figure 4.
Reference the pressure table located on the front lower
panel and Table 2 within this manual.

Manual 2100-506
Page 6 of 14
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TABLE 1
CH DEHUMIDIFIER PERFORMANCE

Manual 2100-506
Page 7 of 14
High Side Pressure:±5°
evacuated, and recharged to serial plate instructions.
Capacitor for Compressor/Blower Motor: Part #8552-085, 15/5 MFD 370V
SYSTEM REFRIGERANT PRESSURE CHART
Low Side pressure: ±2° Table is based upon rated CFM (airflow) across the Evaporator
Coil. If there is any doubt as to the correct operating charge
being in the system, the charge should be removed, system
7961-679
50% RH 55% RH 60% RH
65% RH
70% RH 75% RH 80% RH
Low Side 96 97 98
100
102 104 106
Hi
g
h Side 248 253 258
261
265 269 273
Low Side 110 112 114
116
117 118 120
Hi
g
h Side 270 276 282
288
294 298 303
Low Side 115 119 123
127
132 136 140
Hi
g
h Side 297 306 315
324
333 342 351
Low Side 120 127 134
141
148 153 158
Hi
g
h Side 342 349 356
363
370 375 380
75° DB
80° DB
85° DB
Relative Humidity %Return Air
Temperature Pressure
70° DB
TABLE 2
CHARGING PRESSURE LABEL

Manual 2100-506
Page 8 of 14
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Manual 2100-506
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Manual 2100-506
Page 11 of 14
MIS-2456
Door
(under fill plate)
Dehumidifier
Control Panel
Door
Dehumidifier
Knockout
Filter Access
Access Panel
Ø1.500 Drain Fill Plate
Unit Right Side
Hex grille pattern
Door
Vent Option
Service
Ports
Drain Tube
(must have trap)
Field Supplied
FIGURE 4

Manual 2100-506
Page 12 of 14
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Manual 2100-506
Page 13 of 14
CABINET and FUNCTIONAL COMPONENTS
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Manual 2100-506
Page 14 of 14
CABINET and FUNCTIONAL COMPONENTS
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