Surna SCMDH-300 Installation and operation manual

Surna Dehumidier
Operating & Maintenance Manual
www.surna.com
303.993.5271
Models: SCMDH-300, SCMDH-300WC Revised: September 2015

3
Table of Contents
Warranty Information 4
Limited Warranty 4
Limitation of Liability 4
Warranty Disclaimer 4
Product Suitability 4
Service Under Warranty 5
Service NOT Under Warranty 5
Warnings 6
Safety Symbols 6
Safety Guide 6
Parts List 8
Mechanical Installation 9
Electrical 9
Plumbing 9
Normal Operation 9
Routine Maintenance 9
System Specications 12

4
Warranty Information
If you are missing parts or believe that you have
a warranty issue, DO NOT return this item to the
store of purchase. You must contact Surna at
303.993.5271 for troubleshooting and service
instructions.
Thank you for choosing the IsoDehu 2-ton
Dehumidier by Surna. Because your
dehumidier is built with leading technologies
and the highest quality components, with proper
care and maintenance, it will provide you with
years of worry free service. Please examine the
unit upon arrival to be sure there is no damage
as a result of shipping. If shipping damage has
occurred, please not the damage on the
receiving slip, and contact Surna immediately.
Limited Warranty
A 90-day all-inclusive warranty for: parts, labor,
and shipping. Choice of repair facility and
technician is at the discretion of Surna.
A 1-year warranty on any defective part is also
provided. Choice of repair facility and
technician is at the discretion of the dehumidier
owner, although Surna is happy to assist with
locating a technician. If Surna chooses the
technician, limited labor coverage may apply.
NOTE: Extended warranty for parts, labor and
shipping are available for purchase for a nominal
fee. Contact Surna within 15 days of your dehu’s
arrival if you would like to purchase an extended
warranty
Limitation of Liability
To the extent allowable under applicable law,
Surna’s liability for consequential and incidental
damages is expressly disclaimed. Surna’s liability
in all events is limited to and shall not exceed the
cost of repair. Shipping damage is not covered
under warranty. In the event that the item(s)
arrive with shipping damage, Surna will assist with
the repair or replacement of the damaged item
ONLY if the damage is noted on the delivery
receipt.
Warranty Disclaimer
Surna provides product information in this
literature for the sole purpose of identication,
and does not state or imply that the products are
merchantable, or t for a particular purpose, or
that the products will conform to the descriptions.
Product Suitability
Many jurisdictions have codes and regulations
governing sales, construction, installation, and/
or use of products for certain purposes, which
may vary from those in neighboring areas. While
Surna attempts to ensure that its products
comply with such codes, it cannot guarantee
compliance, and cannot be responsible for how
the product is installed or used. Before purchase
and use of a product, review the product
applications, and all applicable national and
local codes and be sure that the product,
installation and use will comply with them.

5
Service Under Warranty
This product is warranted by Surna against
defects due to fault in workmanship or materials.
If the product has been damaged under
normal use, it will be entitled to warranty service
of the type described and within the timeframes
outlined. Damage caused by abnormal use, or
after the timeframes outlined have expired, carry
no such guarantee. Service under warranty is
provided only upon presentation of reasonable
evidence (purchase receipt) that the date of
claim is within the warranty period.
Service NOT
Under Warranty
The warranty is not valid if the defect is due to
accidental damage, misuse, shipping damage,
neglect, or in the case of alterations or repair
carried out by unauthorized persons. Surna can,
at its discretion, assist the consumer with shipping
claims in the case of damage incurred during
shipping, so long as the customer follows the
instructions outlined above.

6
Warnings
Safety Symbols Used
Dehumidier Safety Guide
Please read the information in this document
carefully prior to attempting the installation,
operation and/or servicing of the
dehumidifer unit. This document contains all
information required to install and operate the
Surna dehumidifying devices. Failure to follow
the directions provided herein may impair the
safeties provide and could cause damage to
the dehumidier equipment and or accessory
equipment, damage to building facilities, and/
or cause serious injury or death to the operator.
Please adhere to all applicable safety guideline
requirements in this document and all applicable
electrical and mechanical jurisdictional codes.
Prior to providing power to the equipment, be
sure to inspect the area for water spills, which
may present a shock hazard to the user. Take
extra care to mount accessory electrical
equipment away from areas regularly exposed
to water and be sure to provide secure wire and
cable routing to protect personnel from shock
hazards.
Only operate the equipment with an
appropriately sized switch or circuit breaker in
place and wire sizes with adequate current
carrying capacity. Consult with an electrician
and the specications section of this manual
before attempting electrical installation. The
switch or circuit breaker shall be accessible
without the use of a tool, shall be easily
accessible to users, shall be clearly marked with
“ON” and “OFF” positions, and shall disconnect
all current carrying conductors simultaneously.
CAUTION: Important information, consult
product manual and read the provided
instructions carefully.
WARNING: Potential electric shock hazard.
Protective Earth Connection
Action Prohibited
Prior to installing the dehumidier, apply power
to the unit following the operations instructions
below and verify the fan and compressor are
operating normally.

7
Using Surna Dehumidier equipment in a manner
not described in this manual may void its
warranty and any safeties provided herein.
This equipment is not meant for connection to a
ducting system.
Only use parts provided with, or specied for use
with, the dehumidier equipment.
Following unit installation and maintenance
activities, the user shall observe the system
operation to verify that normal operation has
resumed prior to letting the equipment to
operate unattended.
Care must be taken when handling sheet metal.
Sheet metal parts have sharp edges and could
cause injury.
The components of this fan coil have been
inspected at the factory and readied for
shipment. Upon receiving the shipment a visual
inspection of the packaging must be performed.
DO NOT use Ethylene Glycol with this system.
Only Propylene Glycol is to be used at prescribed
mixture ratios.
This unit must be connected to a protective
earthing system prior to operation. DO NOT
remove the grounded connection while power
is being supplied to the Surna air handling equip-
ment. Doing so presents an electric shock haz-
ard to users and service personnel.

8
Below is a list of all parts provided with each
Surna Dehumidier purchase.
Dehumidier Parts List
1. Dehumidier Product Manual
2. Surna Dehumider
3. Humidistat Switch
3. Humidistat Switch
2. Dehumidier

9
This dehumidier is meant for ceiling mounting
within the space that requires conditioning.
When mounting, be sure that the supporting
surface and mounting means are suitably rated
to support the dehumidier weight load (see
Specications Section of this document). To
mount the unit to the ceiling, the four mounting
brackets provided on the chassis exterior may be
used in concert with an equivalent to 1/2”
All-thread to mount the dehumidier to the
building installation. When mounting, care must
be taken to slope the unit towards the
condensate drain port. This slope has been built
into the mounting bracket positioning, so simply
verify that the mounting brackets are level with
respect to one another to ensure proper
drainage.
This unit is connected to the power system
using the supplied plug and power cord. Be
sure to read the Specications section of this
document for more information on the
power and circuit breaker requirements. An
on/off switch is used to power on the
equipment which is located on the front face
of the unit and should be switched on to
begin normal operation. Along with this, an
external switch or circuit breaker shall be use
as the primary disconnect device. The
disconnect device shall be accessible to
users, have a clearly marked on/off position,
and must disconnect all current carrying
conductors simultaneously.
Connection is provided for incorporating
a humidity controller or switch. To use this
feature of the dehumidier, simply install the
switch wire in the provided connector block
and make the connection to the mating end
attached to the exterior of the unit.
Installation Instructions
Mechanical Installation
Electrical
This product is designed to provide many years of
dependable, trouble free comfort when properly
maintained. Proper maintenance will consist of
routine coil cleanings, lter changes, and
condensate drain inspection/cleaning. Failure
to provide periodic check-ups and cleaning can
result in excessive operating cost and/or
equipment failure.
Routine Maintenance
To start normal operation, ip the switch on the
front of the unit to the “ON” position and set the
humidity controller that is being used to the
desired setting for that space. If using the
water-cooled version, verify that the ow rate
to the unit is set to 5 gallons per minute for best
results.
Normal Operation
Plumbing
The water-cooled dehumidier unit has a
dedicated water inlet connection and a
dedicated water outlet connection, while the
non-water cooled model does not incorporate
water connections outside of the condensate
drain. When installing connections water inlet/
outlet connections on the water-cooled model,
take care to verify that they are not reversed, or
the unit will not operate properly. Refer to the
Specications section of this document for water
connection sizes and types. Proper insulation
shall be provided for the water lines in
accordance with local and national building
codes.
Condensate drains should be connected to a
waste or reclamation system in order to direct
the condensate out of the space. Be sure that
condensate lines remain unobstructed to avoid
unattended spillage or drain pan overow. Use
of a p-trap is recommended to avoid pressure
and vacuum related issues which can negatively
affect condensate drainage. Following
plumbing installation, the system should be
checked for leaks prior to attempting
unattended operation of the system.

10
Installation Connections
ABC
D
Installation Connections
A –Dehumidistat Switch Connector
B –ON/OFF Toggle Switch
C – Set Screw (for air filter removal)
D –Condensate Drain

11
A
BC
Installation Connections
A –Mounting Brackets
B –Water Inlet (water-cooled model only)
C – Water Outlet (water-cooled model only)

12
System Specications

Dehumidier Wiring Diagram
208/230 VAC
Transformer
24 VAC
CONTACTOR
FAN
MOTOR
FAN
C A P.
RED
COMPRESSOR
YELLOW
BLK BLUE
COMPRRESSOR
C A P.
BLK
BLUE
BLK
BLUE
RED
Temperature
Controller
DELAY RELAY
CUSTOMER
CONNECTION
NEUTRAL
GREEN
RED
X X
ORANGE (240 VAC)
208
WHITE (COM)
120
X
X
400 PPD DEHUMIDIFIER
WIRING DIAGRAM
GND
Supplied
230 VAC
Plug/Power
Cord
LINE
WHITE
TOGGLE
SWITCH
BLUE
RED
BLUE
RED

303.993.5271 [email protected] surna.com
1780 55th Street Suite A, Boulder, CO 80301