Federal 90 Series User manual

REV 1
5/13/21
TROUBLE SHOOTING GUIDE
Table of Contents
Noise & Lights
…………………………………………………………………………...1
…..……………………………………………………………………….2
…………………………………………………………………………...3
……………………………………………………………………………4
……………………………………………………………………………5
…………………………………………………………………………...6
……………………………………………………………………………7
Hybrid - CRR / RSS
Confection - FCC / FCCR
Hot High Profile - HSSM
Island and Endcap - IMSS / ECSS Italian Glass -
New Bakery - Series 90
ITR/ITG / CGR/SGR / SN Market Series -
SQ
RSSM / NSSM / RSSD / RSSL
High Profile Bakery - Counter Top - WDC / CT
WDC / CT
…………………………………………………………………………...8
Temperature Issues
……………………………………………………………………….9-11
……………..………………………………………………….….12-13
.……………………………………………………………………14-15
.……………………………………………………………………16-17
…………………………………………………………………….18-20
………………………………………………………….………….24-27
Stand Alone RSS and Hybrid
CD-CRR / RSS
Countertop and Hybrid Top Hot
CH / RSS
Confection - FCC / FCCR
Hot High Profile - HSSM
Island and Endcap - IMSS / ECSS
Italian Glass - New Bakery - Series 90
ITR/ITG / CGR/SGR / SN
Market Series - SQ
RSSM / NSSM / RSSD / RSSL …………………………………………………………….…….…28-29
Water on the Floor
…………………………………………………………………….30-31
…………………………………………………………………….32-33
Stand Alone RSS and Hybrid
CD-RSS / RSS
Confection - FCC / FCCR …………………………………………………………………….34-35
…………………………………………………………………….38-40
Island and Endcap - IMSS / ECSS Italian Glass -
New Bakery - Series 90
ITR/ITG / CGR/SGR / SN
Market Series - SQ
RSSM / NSSM / RSSD / RSSL …………………………………………………………………….41-42
.…………………………………………………………………….21-23
…………………………………………………………………….36-37
**Due to continuing engineering improvements, the troubleshooting guide is subject to change without notice
***We strongly recommend all work, including but not limited to diagnosis and repair, of your merchandiser be completed by a professional
certified service technician. Federal Industries is not liable for injury to any person or damage to the merchandiser or property.

CONDITION
Unit Noisy BOTTOM OPEN AIR MERCHANDISERS NOISE AND LED LIGHTS
Check that the condensing coil is not restricted.
If equipped, check that the condenser filter is not restricted
Check the evaporator and condenser fan blades are not hitting
anything.
Check panels for loose fasteners and bent panels that can allow for
vibration.
Check refrigeration lines and condensing unit for vibration.
Check compressor for any abnormal noises.
Lights Not Working
(CRR/CD/CDSS)
Countertop Unit (RSS)
Bottom Unit
Hybrid Or Stand-Alone
If equipped, check that the top unit(s) are plugged in as they have
separate power cords from the bottom-refrigerated case and requires a
separate dedicated circuit for each top case.
Note:
The top unit power cord(s) are hidden behind the decorative back panel
during transit.
Check that the light switch is on.
Shelf lights – lamp cord must be fully seated into receptacle, gently tap
them in with a rubber mallet if needed to make full contact. Check that
the lamp cord is plugged into
the end of the LED light strip. – Replace light if necessary.
Check power AC input voltage at LED driver.
Check to DC output voltage at LED driver.
If no output, disconnect output from unit wiring harness and try again as
LED driver will put itself into protect mode if output harness has a short.
– Replace driver if necessary.
CH Hot Countertop Unit
Check that the heat lamps are on. The CH Hot Countertop / Optional
Top of Hybrid Unit does not contain LED Lighting as the heat lamps are
a majority of the heat source required for the unit to function.
Caution! Light bulbs may be hot.
NOISE & LED LIGHTS
CRR / RSS- (Refrigerated Service Top Unit)
CH – CHSS / RSS – Hot Top Unit (Service and Self-Service Top Unit) CD – CDSS
/ RSS
1

CONDITION
Unit Noisy
(Non-Refrigerated)
If equipped, check ventilation fan motor and blade for obstruction, change as
necessary.
Unit Noisy (Refrigerated
Only)
Close proximity to the counter, vaulted ceilings, tile and overall open floor plan
as well as grouping equipment together can all amplify unit “noise”
Check that the condensing coil is not restricted.
Check the evaporator and condenser fan blades are not hitting anything.
Check panels for loose fasteners and bent panels that can allow for vibration.
Check refrigeration lines and condensing unit for vibration.
Check compressor for any abnormal noises.
Lights Not Working Check that the light switch is on.
Shelf lights – lamp cord must be fully seated into receptacle, gently tap them in
with a rubber mallet if needed to make full contact. Check that the lamp cord is
plugged into the end of the LED light strip. – Replace light if necessary.
Check power AC input voltage at LED driver.
Check to DC output voltage at LED driver.
If no output, disconnect output from unit wiring harness and try again as LED
driver will put itself into protect mode if output harness has a short. – Replace
driver if necessary.
NOISE AND LED LIGHTS
FCC / FCCR CHOCOLATE and CONFECTIONARY CASE
NON-REFRIGERATED / CLIMATE CONTROLLED
2

CONDITION
Case Does Not Operate
Check that the MAIN power switch is on.
Check the circuit breaker box for tripped circuits or blown fuses.
Check that the unit is plugged in.
Check that the control for each shelf is on and is not displaying an error.
Case Lights Are Not Working
Check that light switch is on.
Shelf lights – lamp cord must be fully seated into receptacle, gently tap them
in with a rubber mallet if needed to make full contact. Check that the lamp
cord is plugged into the end of the LED light strip.
Check power AC input voltage at LED driver.
Check to DC output voltage at LED driver.
If no output, disconnect output from unit wiring harness and try again as LED
driver will go into protect mode if output harness has a short.
LED LIGHTS
HSSM
Heated Merchandiser
3

CONDITION
Unit Noisy
Close proximity to the counter, vaulted ceilings, tile and overall open floor
plan as well as grouping equipment together can all amplify unit “noise”
Check that the condensing coil is not restricted.
If equipped, check that the condenser filter is not restricted
Check the evaporator and condenser fan blades are not hitting anything.
Check panels for loose fasteners and bent panels that can allow for
vibration.
Check refrigeration lines and condensing unit for vibration.
Check compressor for any abnormal noises.
Lights Not Working Check that the light switch is on.
Shelf lights – lamp cord must be fully seated into receptacle, gently tap
them in with a rubber mallet if needed to make full contact. Check that the
lamp cord is plugged into
the end of the LED light strip. – Replace light if necessary.
Check power AC input voltage at LED driver.
Check to DC output voltage at LED driver.
If no output, disconnect output from unit wiring harness and try again as
LED driver will put itself into protect mode if output harness has a short. –
Replace driver if necessary.
NOISE AND LED LIGHTS
IMSS 60/84/120 – ECSS 40/60
SELF CONTAINED AND REMOTE OPEN AIR MERCHANDISERS
4

CONDITION
Unit Noisy
(Refrigerated Only)
Close proximity to the counter, vaulted ceilings, tile and overall
open floor plan as well as grouping equipment together can all
amplify unit
“noise”
Check that the condensing coil is not restricted.
If equipped, check the condenser air filter.
Check the evaporator and condenser fan blades are not hitting
anything.
Check panels for loose fasteners and bent panels that can allow
for vibration.
Check refrigeration lines and condensing unit for vibration.
Check compressor for any abnormal noises.
(Hot Deli Only) Check circulation fan and blade.
Lights Not Working Check that the light switch is on.
Shelf lights – lamp cord must be fully seated into receptacle,
gently tap them in with a
rubber mallet if needed to make full contact. Check that the lamp
cord is plugged into the end of the LED light strip. – Replace light
if necessary.
Check power AC input voltage at LED driver.
Check to DC output voltage at LED driver.
If no output, disconnect output from unit wiring harness and try
again as LED driver will put itself into protect mode if output
harness has a short. – Replace driver if necessary.
(Hot Deli Only)
If none of the incandescent lights are working, check the 10A
lamp fuse located on the rear of the case next to the circulation
fan switch.
Check to see that all light bulbs are the proper wattage/voltage
and are working as the light bulbs also throw heat into the case.
(120V, 60W coated bulbs only
unless otherwise specified 230V)
Note: Even though some models are supplied 208V – 240V due
to the overall amp draw, but the wells are split between L1 to
Neutral and L2 to Neutral and the circuitry inside the unit is still
120V internally unless outside of the U.S.A.
*** DO NOT CONVERT TO LED BULBS AS THE CASE WILL N
O T RE ACH TEMPERATURE ***
NOISE AND INCANDECENT LIGHTS
NEW BAKERY AND SERIES 90
HOT DELI
5

CONDITION
Unit Noisy
Close proximity to the counter, vaulted ceilings, tile and overall open floor plan as
well as grouping equipment together can all amplify unit “noise”
Check that the condensing coil is not restricted.
Cold Only Check the evaporator and condenser fan blades are not hitting anything.
Check panels for loose fasteners and bent panels that can allow for vibration.
Check refrigeration lines and condensing unit for vibration.
Check compressor for any abnormal noises.
Lights Not Working Check that the light switch is on.
Shelf lights – lamp cord must be fully seated into receptacle, gently tap them in
with a rubber mallet if needed to make full contact. Check that the lamp cord is
plugged into the end of the LED light strip. – Replace light if necessary.
Check power AC input voltage at LED driver.
Check to DC output voltage at LED driver.
If no output, disconnect output from unit wiring harness and try again as LED
driver will put itself into protect mode if output harness has a short. – Replace
driver if necessary.
HOT DELI UNITS NOISE AND LED LIGHTS
Unit Noisy
Close proximity to the counter, vaulted ceilings, tile and overall open floor plan as
well as grouping equipment together can all amplify unit “noise”
Check circulation motor(s) fan and fan(s).
Check panels for loose fasteners and bent panels that can allow for vibration.
Lights Not Working Check that the light switch is on.
Check that the bulbs are good – 120V 60W coated incandescent bulbs only.
Check the light fuse is good.
NOISE AND LED LIGHTS
MARKET SERIES
NON-REFRIGERATED AND REFRIGERATED DELI & BAKERY
6

CONDITION
Unit Noisy
Close proximity to the counter, vaulted ceilings, tile and overall open floor
plan as well as grouping equipment together can all amplify unit “noise”
Check that the condensing coil is not restricted.
If equipped, check that the condenser filter is not restricted
Check the evaporator and condenser fan blades are not hitting anything.
Check panels for loose fasteners and bent panels that can allow for
vibration.
Check refrigeration lines and condensing unit for vibration.
Check compressor for any abnormal noises.
Lights Not Working Check that the light switch is on.
Shelf lights – lamp cord must be fully seated into receptacle, gently tap
them in with a rubber mallet if needed to make full contact. Check that the
lamp cord is plugged into
the end of the LED light strip. – Replace light if necessary.
Check power AC input voltage at LED driver.
Check to DC output voltage at LED driver.
If no output, disconnect output from unit wiring harness and try again as
LED driver will put itself into protect mode if output harness has a short. –
Replace driver if necessary.
NOISE AND LED LIGHTS
RSSM/RSSD/RSSL – ERSSHP – TSSM - NSSM - LMD/LMDM – LPRSS/ELPRSS
OPEN AIR MERCHANDISERS
7

CONDITION
Lights Not Working
Check that the light switch is on.
Counter tops – typically located on the back left bottom of the unit from
customer view.
WDC – Located inside the lower storage compartment on the right side of
the interior ceiling
If equipped, shelf lights – lamp cord must be fully seated into receptacle,
gently tap them in with a rubber mallet if needed to make full contact. Check
that the lamp cord is plugged into the end of the LED light strip. – Replace
light if necessary.
Check power AC input voltage at LED driver.
Check to DC output voltage at LED driver.
If no output, disconnect output from unit wiring harness and try again as LED
driver will put itself into protect mode if output harness has a short. – Replace
driver if necessary.
LED LIGHTS
SPECIALTY BAKERY / COUNTERTOP
NON-REFRIGERATED BAKERY
WDC & CT
8

CONDITION
Case Is Not Holding Temperature
Refrigerated merchandisers are not intended as storage
refrigerators and will not “pull down” room temperature
products efficiently.
LOAD CASE INTERIOR WITH PRE-
CHILLED 38°F OR COLDER PRODUCT ONLY
Refrigerated Merchandisers are subject to air disturbance and due to
direct sunlight and close proximity of heating ducts, grills, radiators,
ceiling fans or main doors. Also, avoid locations where the unit is
subject to high humidity such as
near cases with water misting or fogging devices.
Check Ambient Conditions of the Location
Most of our cases require a maximum ambient of 75°F / 55% RH
(Relative Humidity) Exceeding either or both can result in temperature
issues as the evaporator coil ices up and restricts airflow.
Check that the condenser air inlet and outlet are not restricted.
If equipped, check condenser coil filter is clean.
Check that the condenser coil is clean
Non-refrigerated cases do not regulate internal temperature and may
be slightly higher than ambient temperature due to the lighting in the
unit or
direct sunlight.
Mechanical Thermostat (if
equipped)
If equipped, is a coil sensing thermostat that also controls the cut-in as
well as the cut-out so that the evaporator coil does not ice up.
Check that thermostat is turned on.
Adjust thermostat accordingly, the coldest setting is 9.
Electronic Unit Controller (if
equipped)
Check that the control is turned on.
TEMPERATURE ISSUES
CD or CRR/RSS REFRIGERATED TOP UNIT
OPEN AIR / CLOSED DOOR MERCHANDISERS
STAND ALONE RSS & HYBRID
9

Control Display Is Flashing - If the control is flashing all of its lights, it
is likely that you have a grounding issue with the power source. Verify
that the unit is properly grounded.
Check to see if the compressor run indicator is on, calling for
cooling.
Display Current Supply Air
Temperature
Supply Air Temperature – Press & Hold Down (Defrost) immediately
followed by Up (Power) – You must keep them both held to see the
temperature.
Display Set Point
Check Set Point Temperature; it # 1 is the warmest and # 9 is the
coldest – set
typically between 4 & 5 – adjust accordingly – control has a minimum
run time of 5 minutes and a maximum run of 75 minutes.
Defrost Mode
Is the unit entering into defrost too often, or staying in defrost to
long? Our cases typically defrost every 6 to 8 hours as long as the
evaporator sensor is below defrost termination temperature of
approximately 43°F. There is also a defrost on demand feature that
can supersede the normal defrost interval as needed. (30 minute
maximum defrost duration as well as a 30 minute minimum
between defrosts)
Freezing Product
Adjust temperature control to a warmer set point. (1= Warmest 9=
Coldest)
For electronic control only, verify 10KOhm NTC sensor is reading
properly.
Check that superheat is between 8°F to 12°F.
Product Load should also be a minimum of an inch off of back wall to
allow supply air to circulate and not freeze product at the back wall.
Some items may need more clearance
if they are sensitive to freezing, as supply air temperature needs to get
below freezing.
Warm Product
Adjust temperature control to a colder set point. (1= Warmest 9=
Coldest)
For electronic control only, verify 10KOhm NTC sensor is reading
properly.
Check that the condenser air inlet and condenser air outlet are not
restricted.
Check that all evaporator fan motors and blades are working as they
should.
Check that the condenser fan motor and blade are working as they
should.
Check that the evaporator is clear and not obstructed with ice or debris
Check TXV bulb installation is secure and insulated.
Check that superheat is between 8°F to 12°F.
If equipped, check sight glass for flashing and/or low charge.
See Defrost Mode
10

Compressor Is Not Operating
Check to see if the compressor run indicator is on, calling for
cooling.
Low pressure cutout will keep compressor from engaging even if the
electronic unit controller is calling due to low charge.
Check for power in and out of pressure control as both Low and High
side
pressure cutout will keep compressor from engaging.
Head Pressure Too High Check that the condensing coil is not restricted.
Check that the condenser filter is not restricted.
Check that condenser fan motor is working and the condenser fan is
not
damaged.
Check for restrictions.
Check that refrigerant is not overcharged.
Check the sub-cooling.
Check that the service valves are fully open.
Head Pressure Too Low Check unit for refrigerant leaks.
Perform pump-down procedure to verify the valves are pumping.
If equipped, check if sight glass is flashing or showing low charge.
Low Suction Pressure Check that evaporator fan motors are working.
Check that the air flow is being directed through the evaporator coil. (All
interior panels and must be in place as well as the evaporator fan
shroud.)
Check for restrictions.
Check that the Evaporator Coil is clear of ice and debris.
If equipped, check the sight glass for flashing.
High Suction Pressure Check for refrigerant being overcharged.
Check for refrigeration restrictions.
Perform pump-down procedure to verity the valves are pumping.
11

CONDITION
Unit Is Not Heating Check that the heat switch on.
Check that the thermostat is on high.
Check that the light switch (heat lamps) are on.
Thermometer Not Reading
Correctly
Indicates the approximate temperature of the interior of the case. It does not
indicate food temperature. Actual product temperature can only be
monitored by occasionally probing product with a thermometer probe.
Food Not Held Above 140°F
Check to see that the both shelves are in place and all light bulbs are the
proper wattage/voltage and are working as the light bulbs account for
approximately 70% of the heat source for the unit.
(120V, 60W coated bulbs only unless otherwise specified 230V)
*** DO NOTCONVERT TOLED BULBS AS THE CASEWILL NOTREACH
TEMPERATURE ***
Unit must be preheated prior to placing product into case.
Product temperature entering the case has to be at least 170°F or hotter.
Adjust thermostat to a warmer setting, especially during peak serving periods
to maintain proper product temperature.
Food Dried Out
Check thermostat, is setting to high, probe product to ensure proper product
temperature.
If equipped, check the humidity element is working and that, there is water in
the humidity pan as it is a manual fill. The humidity element is controlled with
the other heaters in the case with the thermostat. Water for the humidity pan
should be preheated when the unit is
in service, as to not lower the air temperature and affect product temperature.
TEMPERATURE & HUMIDITY ISSUES
CH HOT COUNTERTOP CASE
OPTIONAL TOP OF HYBRID UNIT
12

Food Too Warm
Adjust thermostat to a cooler setting, outside of peak serving periods while
maintaining proper product temperature.
REFER TO THE OWNER’S MANUAL FOR MORE DETAIL
13

CONDITION
Case Is Not Holding
Temperature
FCC - Non-refrigerated cases do not regulate internal temperature and may be
slightly higher than ambient
temperature due to the lighting in the unit or direct sunlight.
FCCR - Climate Controlled Case – Federal Chocolate and Confectionary (Case
Is Not Designed For Cold Storage)
The refrigeration system in this type of unit has a
Design Temperature range is between 55°F to 70°F and is considered to be
climate controlled, not “refrigerated”.
Note: This unit cannot be used for perishable products.
Non-Refrigerated / Climate Controlled Merchandisers are subject to air
disturbance and due to direct sunlight and close proximity of heating ducts, grills,
radiators, ceiling fans or main doors. Also, avoid locations where the unit is subject
to high humidity such as near cases with water misting or fogging devices.
Check Ambient Conditions of the Location
Most of our cases require a maximum ambient of 75°F / 55% RH (Relative
Humidity) Exceeding either or both can result in temperature issues as the
evaporator coil ices up and restricts airflow.
Check if the compressor is running.
Check that the condenser air inlet and outlet are not restricted.
Check that the condenser coil is clean
Warm Product Check that thermostat is on.
Check for proper power at the compressor.
Adjust thermostat accordingly, the coldest setting is 9.
Check TXV bulb installation is secure and insulated.
Check that superheat is between 8°F to 12°F.
If equipped, check sight glass for flashing and/or low charge.
Off cycle defrost mode.
Check for power in and out of pressure control as both Low and High side pressure
cutout will keep compressor from engaging.
Sweating
Front glass or product may sweat if the temperature inside the case gets too cold or
the %RH inside the case gets too high.
Humidity Control
Controls how much heat is introduced to the interior of the case to compensate run
time of the compressor. The lower the % RH, the more heat is applied and the
higher the % RH less heat is applied allowing the unit allowing the thermostat to
satisfy sooner. With the humidity control turned off, and the cold control maxed, the
case will achieve its coldest possible setting and potentially cause the unit to sweat
as a result.
Mechanical Thermostat
Coil sensing thermostat also controls the cut-in as well as the cut-out so that the
evaporator coil does not ice up.
Adjust thermostat accordingly, the coldest setting is 9.
Check that superheat is between 8°F to 12°F.
TEMPERATURE ISSUES
FCC / FCCR – CHOCOLATE and CONFECTIONARY CASE
NON-REFRIGERATED / CLIMATE CONTROLLED
14

Compressor Is Not
Operating
Check that thermostat is on.
Head Pressure Too High
Check that the condenser air inlet and outlet are not blocked.
Check that the condensing coil is not restricted.
Check that the condenser filter is not restricted.
Check that condenser fan motor is working and the condenser fan is not damaged.
Check that refrigerant is not overcharged.
Check the sub-cooling.
Check that the service valves are fully open.
Head Pressure Too
Low
Check unit for refrigerant leaks.
Perform pump-down procedure to verify the valves are pumping.
If equipped, check if sight glass is flashing or showing low charge.
Low Suction Pressure Check unit for refrigerant leaks.
Check that evaporator fan motors are working.
Check that the air flow is being directed through the evaporator coil.
(All interior panels and must be in place as well as the evaporator fan shroud.)
Check that the Evaporator Coil is clear of ice and debris.
If equipped, check the sight glass for flashing.
High Suction Pressure Check for refrigerant being overcharged.
Check for refrigeration restrictions.
Perform pump-down procedure to verity the valves are pumping.
15

CONDITION
Control Display Is Flashing
If all the control lights are flashing, it is likely that you have a grounding
issue with the power source. Have wiring inspected by a qualified
electrician.
No Display on Controller.
Check supply voltage on terminals #6 and #7 on the back of the
controller. If proper voltage is present, replace controller.
Control Error
Error EO = Shelf probe is reading Open or Shorted – unplug shelf and
ohm out probe at room temperature.
Note: The error will automatically clear within seconds once the
connection is restored if the sensor is giving the control a reading.
Turn the main power switch to off to power the unit down; Wait 10
seconds, and power the unit back on.
If error is still present, ensure all heater cords are fully seated into their
receptacles.
Verifying Shelf Temperature
On Controller
To Temporarily See the Current Shelf Temperature
Press & Hold Down (Defrost) immediately followed by Up (Power) You
must keep them both held to see the temperature.
Verifying Shelf Temperature
With Separate Probe
A Contact probe should be, at approximately the center of the shelf and
should read within approximately 15°F of the controller reading.
Temperature Is Too Low Check supply voltage to case is above 208 Volts.
Increase control set point.
Look for HVAC discharge vents, fans, and other potential air
disruptions.
If using rack, check rack orientation. Flip rack over if needed so product
is
closer to the shelf surface.
TEMPERATURE ISSUES / CONTROL
HSSM
Heated Merchandiser
16

Ohm out probe to verify it is giving a proper reading. See 60 KOhm
sensor chart.
Temperature Is Too High Decrease control set point.
Check the control for errors and contact service
Use supplied food rack to reduce heat intensity on food.
Ohm out probe to verify it is giving a proper reading. See 60 KOhm
sensor chart.
17

CONDITION
Case Is Not Holding Temperature
/ Freezing Product
Open Air refrigerated merchandisers are not intended as storage
refrigerators and will not “pull down” room temperature products efficiently.
LOAD CASE INTERIOR WITH PRE-
CHILLED 38°F OR COLDER PRODUCT ONLY
Open Air Display Cases are subject to air disturbance and due to direct
sunlight and close proximity of heating ducts, grills, radiators, ceiling fans or
main doors. Also avoid locations where the unit is subject to high humidity
such as near cases with water misting or fogging devices.
Check Ambient Conditions of the Location
Most of our cases require a maximum ambient of 75°F / 55% RH (Relative
Humidity) Exceeding either or both can result in temperature issues as the
evaporator coil ices up and restricts airflow.
Product Load should create a wall all of the way around the shelves to
create a barrier, keeping the cold air inside of the unit. The product should
be a minimum of half an inch off the tower to allow supply air to circulate
and not freeze product at the tower and requires a minimum 2 inches of
clearance above the product. Some items may need more clearance if they
are sensitive to freezing, as supply air temperature during the run cycle
should get well below freezing. Recommended set point is #4 which is
22°F, except for the IMSS120 (failure of the above steps with cause
extended run times, frozen product, the tower and shelves to sweat, icing of
the evaporator coil and potentially water on the floor)
If equipped, check that the condenser coil air filter attached to the inlet base
panel has been cleaned.
Check that the condenser coil is clean. (example of a restricted condenser
coil vs a clean condenser coil – self-contained)
TEMPERATURE ISSUES
IMSS 60/84/120 – ECSS 40/60
SELF CONTAINED AND REMOTE OPEN AIR MERCHANDISERS
18

No Power
Check that the master power switch is on. (located next to the Carel
Controller)
Carel Electronic Thermostat
(located behind lift up cover)
above the light switch on the top
of the base of the unit.)
Check to see that the control is turned on.
Control Display Is Flashing - If the control is flashing all of its lights, it is
likely that you have a grounding issue with the power source. Verify that
the unit is properly grounded.
Check to see if the compressor run indicator is on, calling for cooling.
Defrost Mode
Is the unit entering into defrost too often, or staying in defrost to long? Our
cases typically defrost every 6 to 8 hours as long as the evaporator sensor
is below defrost termination temperature of approximately 43°F. There is
also a defrost on demand feature that can supersede the normal defrost
interval as
needed. – 30 minute maximum, defrost duration.
Check Set Point Temperature; it # 1 is the warmest and # 9 is the coldest –
set typically between 4 & 5 – adjust accordingly – control has a minimum
run time of 5 minutes and a maximum run of 75 minutes (self-contained
units) and 60 minutes (remote condensing unit).
Supply Air Temperature – Press & Hold Down (Defrost) immediately
followed by Up (Power) – You must keep them both held to see the
temperature.
Check the return air grill inside unit for obstructions.
Check that the top air discharge diffuser is not blocked with dust or debris.
The airflow should be approximately 200 fpm.
Check that the condenser air inlet and condenser air outlet are not
restricted.
Check that all evaporator fan motor and blades are working as they should.
Check that the condenser fan motor and blade are working as they should.
Check that the evaporator is clear and not obstructed with ice or debris
Check TXV bulb installation is secure and insulated.
Check that superheat is between 8°F to 12°F.
If equipped, check sight glass for flashing and/or low charge.
Compressor Is Not
Operating
Check the electronic temperature control to see if the unit has the
compressor indicator illuminated.
19