COMMERCIAL/
RESIDENTIAL
1.5-8 TON CHILLER
OPERATING AND
MAINTENANCE MANUAL
surna.com
Models: 1-18-01, 1-24-01,
1-48-01, 1-96-01, 1-96-02
October 2017
TABLE OF CONTENTS
Specifications 4
Warnings 6
Warranty Information 8
Installation Instructions 10
Operation Instructions 16
Routine Maintenance 17
Troubleshooting 18
3
SPECIFICATIONS
PHYSICAL
1.5 TON
1-18-01
2 TON
1-24-01
4 TON
1-48-01
8 TON
1-96-01
8 TON
1-96-02
Length 32 in 35 in 38 in 45 in
Width 28 in 30 in 35 in 40 in
Height 28 in 28 in 41 in 39 in
Weight 165 lbs 240 lbs 260 lbs 355 lbs
ELECTRICAL
Volts - Phase 208/230V Single Phase
208/230V
Three Phase
460V Three
Phase
Compressor FLA 7.6A 12A 20.2A 30.5A 16.7A
Minimum Circuit
Ampacity
17.6A 19.1A 32.8A 43.2A 24.4A
Maximum
Overcurrent
Protection
30A 50A 70A 40A
PERFORMANCE & MECHANICAL
Nominal Cooling
Capacity
18,000 BTU/hr 27,000 BTU/hr 48,000 BTU/hr 96,000 BTU/hr
Flow Rate 5 GPM 5.5 GPM 9 GPM 18 GPM
Decibels 75 78 77 84
Water Line In 3/4 in FNPT 1 in FNPT
Water Line Out 3/4 in FNPT 1 in FNPT
EER / IPLV 10.5/16.8 9.9/15.4 10.2/15.6 10.1/15.4 10.1
Certifications ETL
4
5
DEFINITIONS
CAUTION: Important information, consult product
manual and read the provided instructions carefully.
WARNING: Risk of death/serious injury if warning
isn’t heeded.
DANGER: Risk of death/serious injury if danger
isn’t avoided.
SAFETY SYMBOLS USED
CAUTION: Important information, consult
product manual and read the provided
instructions carefully
WARNING: Potential electric shock hazard
WARNING: High voltage
Protective Earth connection
Action prohibited
CHILLER SAFETY GUIDE
Please read the information in this document carefully
prior to attempting the installation, operation and/or
servicing of the Surna chiller. This document contains
all information required to install and operate the Surna
chiller commercial line of water-cooling devices. Failure
to follow the directions provided herein may impair
the safeties provided and could cause damage to the
Surna chiller 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
breaker in place and wire sizes with adequate current
carrying capacity. Consult with an electrician before
attempting electrical installation.
Using the Surna chiller equipment in a manner not
described in this manual may void its warranty.
WARNINGS
6
After following unit installation and maintenance
activities, observe the system operation to verify that
normal operation has resumed prior to leaving the
equipment to operate unattended.
Only use parts provided with, or specified for use with,
the Surna chiller equipment.
DO NOT operate the Surna chiller at a temperature
setting lower than 45°F (7°C) or risk freezing the
evaporator, which is not covered under the product
warranty.
DO NOT operate the Surna chiller without an
appropriate mixture of propylene glycol. Surna
recommends using a 50%/50% (glycol/water) mixture
when outdoor temperatures fall below 20°F (-7°C). In
all cases, maintain a minimum 30% propylene glycol by
volume. Use only colored, USP food grade propylene
glycol.
DO NOT use the Surna chiller indoors.
DO NOT operate the Surna chiller without adequate
water flow. Process fluid must be supplied at 2.5 GPM
per nominal cooling ton (i.e. 18 GPM for 8-ton chiller) to
reduce the risk of freezing evaporator.
DO NOT remove the grounded connection while power
is being supplied to the Surna chiller equipment. Doing
so presents an electric shock hazard to users and service
personnel.
Chiller systems shall be used in accordance with the
safety regulations in your local jurisdiction. Please
contact Surna if you are unsure about how to properly
incorporate our chillers within your system.
7
Equipment manufactured by Surna (“Company”), the
warranty shall exist for a period of twelve (12) months
from initial start-up or eighteen (18) months from date
of shipment, whichever period is shorter, against failure
due to defects in material and/or manufacturing and
warranted to the capacities and ratings set forth in
Company’s catalogs and bulletins (“Warranty”).
Equipment, material, and/or parts that are not
manufactured by Company are not warranted by
Company and carry such warranties as may be extended
by the respective manufacturer.
Exclusions from this Warranty include damage or failure
arising from: wear and tear; corrosion, erosion,
deterioration; modifications made by others to the
Equipment; repairs or alterations by a party other than
Company that adversely aect the stability or reliability
of the Equipment; vandalism; neglect; accident; adverse
weather or environmental conditions; abuse or improper
use; improper installation; commissioning by a party
other than Company; unusual physical, electrical or
mechanical stress; lack of proper startup or maintenance
as recommended by Company; operation with any
accessory, equipment or part not specifically approved
by Company; and/or refrigerant not recommended or
supplied by Company.
Company shall not be obligated to pay for the cost of
lost refrigerant or lost product or any other direct,
indirect, or consequential damages. Company’s
obligations and liabilities under this Warranty are limited
to furnishing replacement equipment or parts, at its
option, FCA (Incoterms 2000) factory or warehouse
(f.o.b. factory or warehouse for US domestic purposes) at
Company-designated shipping point, freight allowed to
Company’s warranty agent’s stock location, for all
non-conforming Company manufactured Equipment
which have been returned by Customer to Company.
Returns must have prior written approval by Company
and are subject to restocking and replacement charges
where applicable.
No warranty liability whatsoever shall attach to Company
until Customer’s complete order has been paid for in full
and Company’s liability under this Warranty shall be
limited to the purchase price of the Equipment shown to
be defective.
Additional warranty and service protection is available
on an extra-cost basis and must be in writing and
agreed to by an authorized signatory of the Company.
The warranty excludes: (a) labor, transportation and
related costs incurred by the Dealer or Customer; (b)
re-installation costs of repaired equipment; (c) reinstallation costs of replacement equipment; (d) removal
costs of equipment; (e) consequential damages of any
kind; and, (f) reimbursement for loss caused by
interruption of service.
EQUIPMENT MANUFACTURED BY COMPANY THAT
INCLUDES A REQUIRED START-UP AND SOLD IN
NORTH AMERICA WILL NOT BE WARRANTED BY
COMPANY UNLESS COMPANY OR ITS AUTHORIZED
AGENT PERFORMS THE EQUIPMENT STARTUP.
WARRANTY
INFORMATION
8
COMPANY MAKES NO REPRESENTATION OR
WARRANTY, EXPRESS OR IMPLIED, REGARDING
PREVENTION OF MOLD/MOULD, FUNGUS, BACTERIA,
MICROBIAL GROWTH, OR ANY OTHER
CONTAMINATES.
EXCEPT FOR COMPANY’S WARRANTY EXPRESSLY
SET FORTH HEREIN, COMPANY DOES NOT MAKE,
AND HEREBY EXPRESSLY DISCLAIMS, ANY
WARRANTIES, EXPRESS OR IMPLIED CONCERNING
ITS PRODUCTS, EQUIPMENT OR SERVICES,
INCLUDING, WITHOUT LIMITATION, ANY WARRANTY
OF DESIGN, MERCHANTABILITY OR OF FITNESS FOR
A PARTICULAR PURPOSE, OR OTHERS THAT ARE
ALLEGED TO ARISE FROM COURSE OF DEALING OR
TRADE.
CHILLER ORDER
Below is a list of all parts provided with each Surna
Chiller. The following are included with the order
(quantities are dependent on individual order).
1. Surna commercial/residential chiller (1.5-8 tons)
2. Surna commercial/residential product manual
3. Brass wye strainer
4. Flowmeter: 2-20 GPM rotameter style
9
LOCATION
Provide rigid, non-warping mounting pads or a concrete
foundation of sucient strength and mass to support
the total weight (including completed piping and full
operating charges of refrigerant, oil, and water). Once in
place, the unit must be level within ¼ inch (0.64 cm) over
its length and width. Consult your local building codes
and guidelines before attempting roof mounting.
Following installation, verify there is a minimum of 24
inches (60.96 cm) of clearance from obstruction on all
sides and 7 feet (2.13 m) of clearance above the unit to
ensure proper airflow over the condenser.
ELECTRICAL
All wiring must comply with local codes and the latest
version of the National Electric Code (NEC). Electrical
work should only be performed by licensed, qualified
contractors. Ensure all conductors and circuit breakers
are appropriately sized. Reference the specifications
section in this document for electrical details.
PLUMBING
IMPORTANT: Chillers are designed to run on a mixture
of propylene glycol and water. Maintain a minimum
30% propylene glycol by volume. A 50%/50% mixture
is necessary when outdoor temperatures fall below 10°F
(-12°C). Running the chiller with insucient quantities
of glycol can lead to damage, which is not covered by
warranty. DO NOT use ethylene glycol in the Surna
chiller system.
Depending on the size of your unit, the chilled water
plumbing connections will be either ¾ inch (1.9 cm) or 1
inch (2.54 cm). Refer to the specifications section in this
document for further details. When transitioning to PVC,
larger pipe must be used. Contact Surna with questions
on pipe sizing.
Be sure to install the water connections to the
appropriately labeled “WATER IN” and “WATER OUT”
ports on the chiller unit. The chiller will not function if
these connections are reversed.
INSTALLATION
INSTRUCTIONS
10
IMPORTANT PLUMBING TIPS
ALWAYS use a backup wrench when installing water fittings. Failure to do so can
cause damage to the copper lines, which is not covered under warranty.
ALWAYS use the brass strainer that is provided with the unit. The strainer must be
installed on the supply line water connection to prevent particles from entering
and damaging the heat exchanger. Clean the strainer regularly to maintain
optimum water flow.
Periodically check the strainer to verify that the chiller is receiving the desired
water flow. A decrease in flowrate could indicate a clogged filter. Isolate the flow
to the chiller before opening the wye strainer to inspect or service.
Monitor chiller flowrate using a properly sized rotameter or vortex (turbine – type)
flowmeter. Chiller flow should be within 25-75% of device full scale range.
Process fluid must be supplied to the chiller at a rate of 2.5 GPM per nominal
cooling ton. Improper flow can lead to permanent equipment damage and/or
reduced cooling performance.
The proper pump sizing depends on many factors and is critical to system
operation and reliability. Please contact Surna for more details on properly sizing
your pump.
11
INSTALLATION CONNECTIONS
A - Water Inlet B - Water Outlet C - Electrical Panel D - Power Connections
E - Cable Routing Port F- Delay Timer G - Grounding H - Power Connection (On/O Switch)
A B C
D E
F
D
G
H
NOTE: If the compressor makes an unusual noise after applying 3-Phase power (8-ton 480V), the power wiring
has been installed backwards. Shut the unit off immediately, shut the electric supply off at the breaker, and
reverse any 2 of the 3 line conductor wires.
1.5- to 4-Ton Units 8-Ton Units
12
CONTROL PANEL CONNECTIONS
A - Control Panel Exterior B- Low Pressure Switch C - Heat Exchanger D - Temperature Controller
E - Thermal Expansion Valve F - Flow Switch G - Fan Cycle Switch H - High Pressure Switch
A
E
F
B
4-Ton Chiller
8-Ton Chiller
A
C
D
G
C
D
E
F*
H
G
B
*Located behind H
13
1.5 TO 4TON WIRING DIAGRAM
14
8TON WIRING DIAGRAM
15
OPERATION
INSTRUCTIONS
TEMPERATURE SETTINGS
After chiller electrical and plumbing connections are completed, power on the chiller unit and set desired
temperature as follows:
1. Turn the chiller on using the power switch- see H on installation connections diagram.
2. Press “Set” once: Choose Celsius or Fahrenheit using up or down arrows.
3. Press “Set” twice: Using the up and down arrows, set chiller exiting water temperature. Recommended
set point is 55°F (12°C).
4. Press “Set” three times: This is the temperature dierential. It is factory preset at 3 degrees and should
not be changed without consulting Surna.
5. Press “Set” four times: This is the mode; it is factory preset to “C1” and will not function in any other
mode.
All other settings should never be changed from the factory presets.
CONTACT US
Contact Surna via email at support@surna.com or via phone at 303.993.5271.
16
SYSTEM INSTRUCTIONS AND RECOMMENDATIONS
No. Equipment Task Description for Chillers Frequency*
1 Chiller Check wye strainer for particulates and/or debris. Clean as needed to
ensure proper operation.
Q1, SA, Q3, A
2 Chiller Verify chiller flow rate to achieve optimal energy eciency. Advise on
adjustments or repairs to restore proper flow ensuring proper
operation.
Q1, SA, Q3, A
3 Chiller Perform chemical testing of system water. Advise on treatment to
ensure proper water chemistry and freeze protection.
Q1, SA, Q3,A
4 Chiller Check for evidence of improper operation. Advise on replacement
components as needed to ensure proper operation.
Q1, SA, Q3, A
5 Chiller Visually inspect fan blades and shroud for any signs of damage or
excessive wear. Advise on adjustments or repairs to ensure proper
operation.
Q1, SA, Q3, A
6 Chiller Visually inspect condenser coil for buildup of particulates and/or
debris. Clean coil as needed to restore optimal energy eciency.
Advise on repairs to ensure proper operation.
SA, A
7 Chiller Check system temperatures. If outside of recommended operating
levels, find cause. Advise on necessary adjustments and/or repairs to
ensure proper operation and optimal energy eciency.
SA, A
8 Chiller Check control box for dirt, debris, loose connections, and signs of
damage. Clean, tighten as needed, advise on repairs to ensure proper
operation.
A
Legend*
Q1 First Quarter
SA Semi-Annually
Q3 Third Quarter
A Annually
ROUTINE
MAINTENANCE
17
TROUBLESHOOTING
This unit is equipped with safety sensors that may include
high and low pressure sensors for the refrigeration circuit
and also a flow switch to help prevent freezing if there
is a pump failure or other loss of flow. If any of these
sensors detect a problem, they will not allow the chiller to
function.
Some of the troubleshooting steps listed below can be
performed by the end user, and some of these steps must
be performed by a licensed HVAC technician. Retain this
guide should your chiller ever require servicing.
TEMPERATURE CONTROLLER HAS
NO POWER
1. Ensure switch is in the on position.
2. Check breaker for proper function.
3. Check flow meter for adequate water flow (2.5
GPM per ton). Insucient flow will cause loss of
power.
4. Visually check for any loose wires.
THE FOLLOWING STEPS SHOULD BE PERFORMED BY
QUALIFIED SERVICE PERSONNEL ONLY
5. Check flow for proper voltage at the unit with an
electric volt-meter.
6. Remove the front cover of the temperature
sensor and check voltage. If 24 VAC is presen
and all wires are installed and tight, the controller
may need to be replaced. If no
voltage is present, see step 7.
7. The controller is wired so that it will not come on
if there is not sucient water flow to the unit. If
there is no voltage at the controller, check the
flow and verify that the chiller is receiving at least
2.5 GPM for each ton of cooling required. If there
is sucient flow, see step 8.
8. Check connections of the flow sensor (the flow
sensor is installed in the water line) to verify there
is 24VAC across the sensor while
sucient water is flowing. If there is no voltage
across the sensor leads with a proper flow-rate,
then the sensor needs to be replaced.
9. Check the direction of flow in the water circuit. If
water is flowing backwards, the flow switch will
not allow power to the temperature controller,
and the unit will not function properly.
TEMPERATURE CONTROLLER IS ON
BUT CHILLER WILL NOT START
1. The unit has a 5-minute delay on start-up
before beginning normal operation. Before
troubleshooting, ensure that 5 minutes have
passed.
2. Check the temperature set-points of the
controller to verify the desired settings are
still in place. The factory dierential temperature
should be 3 degrees, and shouldn’t be changed.
For example, with the factory set dierential
temperature setting of 3 degrees, and a desired
temperature setting of 45°F (8°C), the unit will
not start until the water reaches 48°F (9°C).
3. Check to make sure the controller is set to C1.
18
THE FOLLOWING STEPS SHOULD BE PERFORMED BY QUALIFIED SERVICE
PERSONNEL ONLY
4. Check voltage at contactor (spade terminals on each side) which should be 24VAC while
the temperature controller is calling for cooling. Check for a loose wire on the
controller. If none are found, check for power at the relay inside the controller. If relay
inside the controller has power, unit may have tripped a high/low pressure sensor, in which
case an HVAC technician will need to service your unit. He/she should check the
refrigeration pressures with a gauge set to verify there is not a problem with system
pressures. If no problems are found with pressure, then the high/low pressure sensor may
need to be replaced.
5. Check the voltage across the ENDS of the main contactor with a meter. This should be
240VAC on each side when the temperature controller is calling for cooling. If there is not
240VAC on each side, the contactor is malfunctioning and needs to be replaced.
6. If there is voltage across the contactor when the temperature controller is calling
for cooling and the compressor, fan (or both) are not coming on, the capacitor may be
malfunctioning and should be replaced. Check voltage across the capacitor to verify.
Bulging capacitors are an indication of a problem.
7. If both the compressor and fan are not engaging, then the problem may be an
easily replaceable bolt-on component, and not with the fan or compressor themselves. If
one of the two components is not running after these troubleshooting steps have been
attempted, there may be a problem with one of those components and they may need
to be replaced. The fan motor is easily replaceable and can be done by the end user after
all power has been disconnected from the unit. If compressor replacement is required, a
licensed refrigeration technician must complete the associated repairs.
8. If the refrigerant charge of the unit is in question, recover and weigh the charge. The
amount of refrigerant required in the system is written on the product label. Pressures are
an unreliable indicator of proper charge.
FAN TURNS ON & OFF EVEN THOUGH COMPRESSOR IS
NOT RUNNING
The unit is equipped with a fan cycle switch, in which case the fan will come on only when
absolutely needed. The cycling of the fan is most common in cooler weather.
19
surna.com
1780 55th Street, Suite A
Boulder, CO 80301
303.993.5271
info@surna.com
A
P
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