Heatcraft Refrigeration Products Humidifier H IM UC User Manual

Installation and  
Operations Manual  
H-IM-UC  
August 2008  
Part No. 25008201  
Replaces None. Information formerly included in H-IM-64L  
Unit Coolers  
Table of Contents  
General Safety Information.................................................................. 2  
Inspection ................................................................................................ 2  
Warranty Statement............................................................................... 2  
Placement .............................................................................................3-4  
Defrost Troubleshooting....................................................................... 4  
Condensate Drain Lines ........................................................................ 5  
Field Wiring.............................................................................................. 5  
Check Out and Start Up......................................................................... 5  
Operational Check Out.......................................................................... 6  
Evaporator Superheat ........................................................................... 6  
Expansion Valve Selection.................................................................... 7  
Evaporator Troubleshooting ................................................................ 8  
InterLink Replacement Parts................................................................ 8  
H-IM-UC-0808 | Version 000  
 
Unit Coolers  
Recommended Unit Cooler Placement  
Some general rules for evaporator placement which must be  
followed are:  
1.  
2.  
3.  
4.  
5.  
The air pattern must cover the entire room.  
NEVER locate evaporators over doors.  
Location of aisles, racks, etc. must be known.  
Location relative to compressors for minimum pipe runs.  
Location of condensate drains for minimum run.  
The size and shape of the storage will generally determine the  
type and number of evaporators to be used and their location.  
The following are some typical examples:  
NOTE: Leave space equal to unit height between bottom of unit  
and product. Do not stack product in front of fans.  
Minimum Unit Clearances  
Figure 1. Medium Profile and Large Unit Coolers  
NOTE:  
W = Total width  
of evaporator  
coil surface.  
One evaporator  
Two evaporators  
Figure 2. Low Profile Unit Coolers  
NOTE:  
H = Total height  
of evaporator  
coil surface.  
Two evaporators  
One evaporator  
Figure ꢀ. Center Mount Unit Coolers  
Recommended Maximum - Minimum Dimensions for  
Center Mount Unit Cooler Installations.  
E
S
M
T
Max. Min.  
Max. Min. Max. Min. Max. Min.  
20' 3' 40' 3' 40' 6'  
25'  
2'  
 
Installation and Operations Manual  
Unit Cooler Mounting  
theareaabovetheunitcoolermustbesealedorexposedinsuchaway  
to facilitate hand cleaning without the use of tools. When lagging or  
bolting the unit flush to the ceiling, seal the joint between the top and  
theceilingwithanNSFlistedsealantandendsofopenhangerchannels  
must be sealed to prevent accumulation of foreign matter.  
Most evaporators can be mounted with rod hangers, lag screws, or  
bolts. Use 5/16" bolt and washers or rod for up to 250 pounds, 3/8"  
for up to 600 pounds and 5/8" for over 600 pounds. Care should be  
taken to mount the units level so that condensate drains properly.  
Note that some unit cooler designs achieve drain pan slope by using  
different height mounting brackets. In this situation, the top of the  
mounting brackets should be level. Adequate support must be  
provided to hold the weight of the unit.  
When locating unit coolers in a cooler or freezer, refer to Figures 1  
through 4 for guidelines.  
NOTE: Always avoid placement of Unit Coolers direct above  
doors and door openings.  
When using rod hangers, allow adequate space between the top of  
the unit and the ceiling for cleaning. To comply with NSF Standard 7,  
Figure ꢁ. Large Coolers and Freezers Placement.  
Cooler or Freezers  
where one wall will not  
accommodate all required  
evaporators or where air  
throw distance must be  
considered.  
Baffle  
Cooler or Freezer with Glass  
Glass  
Display  
Door  
Display Doors  
Baffled Unit - Allow sufficient  
space between rear of Unit Cooler  
and wall to permit free return of  
air. Refer to Figures 1 through 3  
(page 3) for proper space.  
Where one wall evaporator  
mounting is satisfactory.  
Elevation view of glass display  
door cooler or freezer. Be sure  
air discharge blows above, not  
directly at doors. Provide baffle if  
door extends above blower level.  
Defrost Troubleshooting  
Fan Motor  
Ifthefanmotorfailstostartwhenthecontrolisbelow35ºF,disconnect  
the fan motor leads and check the motor as described for fan motors.  
Also check whether current is being supplied at “Nand “4from the  
timer. The fan delay control must be below 35ºF when checking for  
a closed circuit.  
Ifthemotordoesnotoperateoritcyclesonthermaloverload, remove  
motor leads from terminal block and apply correct voltage across the  
leads. Ifmotorstilldoesnotoperatesatisfactorily, itmustbereplaced.  
Beforestartingtheunit,rotatefanbladestomakesuretheyturnfreely  
and have sufficient clearance.  
Fan Delay & Defrost Termination Control  
Defrost Heater  
This control is a single pole double throw switch. The red lead wire  
is wired to common. The black wire is wired in series with the fan  
motors. The brown wire is wired in series with the defrost termination  
solenoid in the timer. The brown and red contacts close and the black  
and red contacts open when the temperature is above 55ºF. The black  
and red contacts close and the brown and red contacts open when  
the temperature is below 35ºF.  
Ifunitshowsverylittleornodefrostinganddoesnotheat, disconnect  
heaterandchecktondifitisburnedout. Totest,applycorrectvoltage  
across heater or use continuity flashlight battery tester.  
Drain Pan  
If drain pan has an ice build-up, drain line may be frozen. The  
drain line should be pitched sharply and exit cabinet as quickly as  
possible. Sometimes location and ambient at the drain outside of  
cabinet may cause freeze-up. A drain line heater may be required  
to correct the freeze-up. Any traps in the drain line must be located  
in a warm ambient.  
On initial “pull down” of a warm box the fan will not start until  
the coil temperature reaches approximately 35ºF. If the box is still  
comparatively warm (60ºF) when the fan starts, then blowing this  
warm air over the coil may cause it to warm up to 55ºF and thus stop  
the fan. Therefore, the fan may recycle on initial “pull down. This  
control cannot be adjusted.  
 
Unit Coolers  
Condensate Drain Lines  
Field Wiring  
Eithercopperorsteeldrainlinesshouldbeusedandproperlyprotected  
from freezing. In running drain lines, provide a minimum 1/4 inch per  
foot pitch for proper drainage. Drain lines should be at least as large  
astheevaporatordrainconnection.Allplumbingconnectionsshould  
be made in accordance with local plumbing codes. All condensate  
drain lines must be trapped, and run to an open drain. They must  
never be connected directly to the sewer system. Traps in the drain  
line must be located in a warm ambient. We recommend a trap on  
each evaporator drain line prior to any tee connections.Traps located  
outside, or extensive outside runs of drain line must be wrapped with  
a drain line heater.The heater should be connected so that it operates  
continuously. It is recommended that the drain line be insulated to  
prevent heat loss. A heat input of 20 watts per linear foot of drain line  
for 0˚F (-18˚C) room applications and 30 watts per linear foot for -20˚F  
(-29˚C)roomsissatisfactory. Infreezers,theevaporatordrainpantting  
should be included when heating and insulating the drain line.  
WARNING: All wiring must be done in accordance with  
applicable codes and local ordinances.  
The field wiring should enter the areas as provided on the unit. The  
wiring diagram for each unit is located on the inside of the electrical  
panel door. All field wiring should be done in a professional manner  
and in accordance with all governing codes. Before operating unit,  
double check all wiring connections, including the factory terminals.  
Factory connections can vibrate loose during shipment.  
1.  
2.  
3.  
The serial data tag on the unit is marked with the electrical  
characteristic for wiring the unit.  
Consult the wiring diagram in the unit cooler and in the con-  
densing unit for proper connections.  
Wire type should be of copper conductor only and of the  
proper size to handle the connected load.  
The unit must be grounded.  
For multiple evaporator systems, the defrost termination  
controls should be wired in series. Follow the wiring diagrams  
for multiple evaporator systems carefully. This will assure  
complete defrost of all evaporators in the system.  
Multiple evaporator systems should operate off of one ther-  
mostat.  
Inspect drain pan periodically to insure free drainage of condensate.  
Ifdrainpancontainsstandingwater, checkforproperinstallation.The  
drain pan should be cleaned regularly with warm soapy water.  
4.  
5.  
WARNING: All power must be disconnected before clean-  
ing. Drain pan also serves as cover of hazard-  
ous moving parts. Operation of unit without  
drain pan constitutes a hazard.  
6.  
7.  
If a remote defrost timer is to be used, the timer should be  
located outside the refrigerated space.  
Traps on low temperature units must be outside of refrigerated  
enclosures. Traps subject to freezing temperatures must be wrapped  
with heat tape and insulated.  
Check Out and Start Up  
NOTE: All adjustable controls and valves must be field  
adjusted to meet desired operation. There are no  
factory preset controls or valve adjustments. This  
includes low pressure, high pressure, adjustable  
head pressure systems and expansion valves.  
NOTE: Always trap single evaporator system drain  
lines individually to prevent humidity migration.  
Aftertheinstallationhasbeencompleted,thefollowingpointsshould  
be covered before the system is placed in operation:  
Figure 5. Condensate Drain Lines  
(a) Check all electrical and refrigerant connections.  
Be sure they are all tight.  
(b) Check the room thermostat for normal operation  
and adjust.  
(c) Wiring diagrams, instruction bulletins, etc. attached  
to the condensing units should be read and filed for  
future reference.  
(d) All fan motors on evaporators should be checked for  
proper rotation. Fan motor mounts should be carefully  
checked for tightness and proper alignment.  
(e) Electric and hot gas evaporator fan motors should  
be temporarily wired for continuous operation until  
the room temperature has stabilized.  
(f) Do not leave unit unattended until the system has  
reached normal operating conditions and the oil  
charge has been properly adjusted to maintain the oil  
level between 1/4 and bottom of the sight glass.  
(g) Make sure all Schrader valve caps are in place and tight.  
DRAIN LINE MIN.  
PITCH - 1/4”/ FT.  
VAPOR SEAL  
TRAP  
OPEN  
DRAIN  
5
 
Installation and Operations Manual  
Operational Check Out  
Alternative Superheat Method  
The most accurate method of measuring superheat is found by  
following the previous procedure, Temperature/Pressure method.  
However, that method may not always be practical. An alternative  
method which will yield fairly accurate results is the temperature /  
temperature method:  
After the system has been charged and has operated for at least  
two hours at normal operating conditions without any indication of  
malfunction, it should be allowed to operate overnight on automatic  
controls. Thenathoroughrecheckoftheevaporatoroperationshould  
be made as follows:  
1. Measure the temperature of the suction line at the  
point the bulb is clamped (outlet).  
(a) Checkliquidlinesightglassandexpansionvalveoperation.  
If there are indications that more refrigerant is required,  
leaktestallconnectionsandsystemcomponentsandrepair  
any leaks before adding refrigerant.  
2. Measure the temperature of one of the distributor  
tubes close to the evaporator coil (inlet).  
(b) Thermostatic expansion valves must be checked for  
propersuperheatsettings.Feelerbulbsmustbeinpositive  
contactwiththesuctionlineandshouldbeinsulated. Valves  
set at high superheat will lower refrigeration capacity.  
Low superheat promotes liquid slugging and compressor  
bearing washout.  
(c) Check defrost controls for initiation and termination  
settings, and length of defrost period. Set fail safe at  
length of defrost + 25%.  
3. Subtract the inlet temperature from the outlet  
temperature. The difference is Superheat.  
This method will yield fairly accurate results as long as the pressure  
drop through the evaporator coil is low.  
Figure ꢂ. Bulb and Contact Location  
Example: 20 minute defrost + 5 minutes  
= 25 minute fail safe  
(d) Check drain pan for proper drainage.  
(e) Install instruction card and control system diagram for  
use of building manager or owner.  
Evaporator Superheat  
Check Your Superheat. After the box temperature has reached or is  
close to reaching the desired temperature, the evaporator superheat  
should be checked and adjustments made if necessary. Generally,  
systems with a design TD of 10˚F should have a superheat value of 6˚  
to 10˚F for maximum efficiency. For systems operating at higherTD’s,  
the superheat can be adjusted to 12˚ to 15˚ ˚F as required.  
Figure 7. Multiple Evaporators  
NOTE:  
Minimum compressor suction superheat  
of 20˚F may override these recommendations  
on some systems with short line runs.  
To properly determine the superheat of the evaporator, the following  
procedure is the method Heatcraft recommends:  
WARNING: If the condensing unit has no flooded  
condenser head pressure control, the  
condensing unit must have the discharge  
pressure above the equivalent 105˚F  
condensing pressure.  
1. Measure the temperature of the suction line at the point  
the bulb is clamped.  
2. Obtain the suction pressure that exists in the suction line  
at the bulb location by either of the following methods:  
a. A gauge in the external equalized line will indicate the  
pressure directly and accurately.  
b. A gauge directly in the suction line near the  
evaporator or directly in the suction header of the  
evaporator will yield the same reading as 2a above.  
3. Convert the pressure obtained in 2a or 2b above to  
saturated evaporator temperature by using a  
temperature-pressure chart.  
4. Subtract the saturated temperature from the actual  
suction line temperature. The difference is Superheat.  
 
Unit Coolers  
Table 1. Expansion Valve Selection For 100# Head Pressure Valve  
R-507/Rꢁ0ꢁA  
-20˚F/-29˚C Evap.  
R-507/Rꢁ0ꢁA  
+25˚F/-ꢁ˚C Evap.  
R-22  
-20˚F/-29˚C Evap.  
R-22  
+25˚F/-ꢁ˚C Evap.  
BTUH at about  
10° T.D.  
Sporlan  
ALCO  
Sporlan  
ALCO  
Sporlan  
ALCO  
Sporlan  
ALCO  
3,000-5,000  
5,500-7000  
7500-8000  
8500-10,000  
EGSE 1/2 ZP  
EGSE 1/2 ZP  
EGSE 1 ZP  
EGSE 1 ZP  
EGSE 1 ZP  
HFESC-1/2-RZ  
HFESC-1/2-RZ  
HFESC-1/2-RZ  
HFESC-1-RZ  
EGSE 1/2 C  
EGSE 1 C  
EGSE 1 C  
HFESC-1/2-RC  
HFESC-1/2-RC  
HFESC-1-RC  
EGVE 1/2 Z  
EGVE 1 ZP  
EGVE 1 ZP  
HFESC-1-HZ  
HFESC-1-HZ  
HFESC-1 1/2-HZ  
EGVE 1/2 C  
EGVE 1 C  
EGVE 1 C  
EGVE 1 C  
EGVE 11/2 C  
EGVE 11/2 C  
HFESC-1/2-HC  
HFESC-1-HC  
HFESC-1-HC  
HFESC-1-HC  
HFESC-1-HC  
HFESC-1-HC  
HFESC-2-HC  
HFESC-2-HC  
HFESC-2 1/2-HC  
HFESC-3-HC  
HFESC-3-HC  
HFESC-5 1/2-HC  
HFESC-5 1/2-HC  
HFESC-5 1/2-HC  
HFESC-8-HC  
HFESC-8-HC  
HFESC-10-HC  
HFESC-10-HC  
HFESC-15-HC  
HFESC-15-HC  
HFESC-15-HC  
HFESC-15-HC  
EGSE 11/2 C HFESC-1 1/4-RC EGVE 11/2 ZP HFESC-1 1/2-HZ  
10,500-11,000  
11,500-13,000  
13,500-15,000  
15,500-17,000  
17,500-20,000  
20,500-24,000  
24,500-28,000  
28,500-34,000  
34,500-40,000  
40,500-50,000  
50,500-60,000  
60,500-70,000  
70,500-80,000  
80,500-90,000  
90,500-100,000  
100,500-110,000  
110,500-120,000  
120,500-130,000  
HFESC-1 1/4-RZ EGSE 11/2 C HFESC-1 1/4-RC EGVE 11/2 ZP  
HFESC-2-HZ  
HFESC-2-HZ  
HFESC-2 1/2-HZ EGVE 11/2 C  
HFESC-2 1/2-HZ  
HFESC-3-HZ  
HFESC-3-HZ  
HFESC-5 1/2-HZ  
HFESC-5 1/2-HZ  
HFESC-5 1/2-HZ  
HFESC-8-HZ  
EGSE 11/2 ZP HFESC-1 1/2-RZ EGSE 11/2 C HFESC-1 1/4-RC EGVE 11/2 ZP  
EGSE 11/2 ZP  
EGSE 2 ZP  
EGSE 2 ZP  
SSE 3 ZP  
SSE 3 ZP  
SSE 4 ZP  
OSE 6 ZP  
OSE 8 ZP  
OSE 9 ZP  
OSE 9 ZP  
OSE 12 ZP  
OSE 12 ZP  
OSE 12 ZP  
OSE 21 ZP  
OSE 21 ZP  
OSE 21 ZP  
HFESC-2-RZ  
HFESC-2-RZ  
HFESC-3 1/2-RZ  
HFESC-3 1/2-RZ  
HFESC-3 1/2-RZ  
HFESC-5-RZ  
EGSE 2 C  
EGSE 2 C  
SSE 3 C  
SSE 3 C  
SSE 4 C  
HFESC-1 1/2-RC  
HFESC-2-RC  
HFESC-2-RC  
HFESC-3-RC  
HFESC-3-RC  
HFESC-3-RC  
HFESC-5-RC  
HFESC-5-RC  
HFESC-7-RC  
HFESC-10-RC  
HFESC-10-RC  
HFESC-10-RC  
HFESC-13-RC  
HFESC-13-RC  
HFESC-13-RC  
TRAE-20-RC  
EGVE 2 ZP  
EGVE 2 ZP  
EGVE 3 ZP  
SVE 3 ZP  
SVE 4 ZP  
SVE 5 ZP  
EGVE 2 C  
EGVE 2 C  
SVE 3 C  
SVE 3 C  
SVE 4 C  
SVE 4 C  
SVE 5 C  
SVE 8 C  
SVE 8 C  
SVE 10 C  
SVE 10 C  
OVE 15 C  
OVE 15 C  
OVE 15 C  
OVE 15 C  
SSE 4 C  
SSE 6 C  
HFESC-5-RZ  
HFESC-7-RZ  
SVE 8 ZP  
OSE 8 C  
OSE 9 C  
OSE 9 C  
OSE 12 C  
OSE 12 C  
OSE 12 C  
OSE 21 C  
OSE 21 C  
OSE 21 C  
SVE 10 ZP  
SVE 10 ZP  
OVE 15 ZP  
OVE 15 ZP  
OVE 15 ZP  
OVE 15 ZP  
OVE 20 ZP  
OVE 20 ZP  
OVE 20 ZP  
HFESC-10-RZ  
HFESC-10-RZ  
HFESC-10-RZ  
HFESC-13-RZ  
HFESC-13-RZ  
TRAE-20-RZ  
HFESC-8-HZ  
HFESC-10-HZ  
HFESC-15-HZ  
HFESC-15-HZ  
HFESC-15-HZ  
HFESC-20-HZ  
HFESC-20-HZ  
HFESC-20-HZ  
TRAE-20-RZ  
TRAE-20-RZ  
NOTES:  
1. Valve selections assume standard conditions and 100°F vapor-free liquid.  
2. Equivalent valve may be used in place of selection.  
3. For "Medium Temp R-507," valve designation will use “Pfor refrigerant code.  
Table 2. Expansion Valve Selection 180# Head Pressure Valve  
R-507/Rꢁ0ꢁA  
-20˚F/-29˚C Evap.  
R-507/Rꢁ0ꢁA  
+25˚F/-ꢁ˚C Evap.  
R-22  
-20˚F/-29˚C Evap.  
R-22  
+25˚F/-ꢁ˚C Evap.  
BTUH at about  
10° T.D.  
Sporlan  
ALCO  
Sporlan  
ALCO  
Sporlan  
ALCO  
Sporlan  
ALCO  
3,000-5,000  
5,500-7000  
7500-8000  
8500-10,000  
EGSE 1/2 ZP  
EGSE 1/2 ZP  
EGSE 1 ZP  
EGSE 1 ZP  
EGSE 1 ZP  
HFESC-1/2-RZ  
HFESC-1-RZ  
HFESC-1-RZ  
HFESC-1-RZ  
EGSE 1/2 C  
EGSE 1 C  
EGSE 1 C  
EGSE 1 C  
HFESC-1/2-RC  
HFESC-1/2-RC  
HFESC-1/2-RC  
HFESC-1-RC  
HFESC-1-RC  
EGVE 1/2 ZP  
EGVE 1 ZP  
EGVE 1 ZP  
EGVE11/2 ZP HFESC-1 1/2-HZ  
EGVE 11/2 ZP HFESC-1 1/2-HZ  
HFESC-1/2-HZ  
HFESC-1-HZ  
HFESC-1-HZ  
EGVE 1/2 C  
EGVE 1/2 C  
EGVE 1 C  
EGVE 1 C  
EGVE 1 C  
EGVE 1 C  
HFESC-1/2-HC  
HFESC-1-HC  
HFESC-1-HC  
HFESC-1-HC  
HFESC-1-HC  
HFESC-1 1/2-HC  
10,500-11,000  
11,500-13,000  
13,500-15,000  
15,500-17,000  
17,500-20,000  
20,500-24,000  
24,500-28,000  
28,500-34,000  
34,500-40,000  
40,500-50,000  
50,500-60,000  
60,500-70,000  
70,500-80,000  
80,500-90,000  
90,500-100,000  
100,500-110,000  
110,500-120,000  
120,500-130,000  
HFESC-1 1/4-RZ EGSE 11/2 C  
EGSE 1 1/2 ZP HFESC-1 1/4-RZ EGSE 11/2 C HFESC-1 1/4-RC EGVE 11/2 ZP  
HFESC-2-HZ  
HFESC-2-HZ  
EGSE 2 ZP  
EGSE 2 ZP  
EGSE 2 ZP  
SSE 3 ZP  
SSE 4 ZP  
SSE 4 ZP  
HFESC-1 1/2-RZ EGSE 11/2 C HFESC-1 1/4-RC  
EGVE 2 ZP  
EGVE 2 ZP  
EGVE 3 ZP  
SVE 3 ZP  
SVE 4 ZP  
SVE 4 ZP  
EGVE 11/2 C HFESC-1 1/2-HC  
HFESC-2-RZ  
HFESC-2-RZ  
HFESC-3-RZ  
HFESC-3-RZ  
HFESC-5-RZ  
HFESC-5-RZ  
HFESC-7-RZ  
HFESC-7-RZ  
HFESC-10-RZ  
HFESC-10-RZ  
HFESC-10-RZ  
HFESC-13-RZ  
HFESC-13-RZ  
HFESC-13-RZ  
HFESC-13-RZ  
EGSE 2 C  
EGSE 2 C  
SSE 3 C  
SSE 3 C  
SSE 4 C  
HFESC-1 1/2-RC  
HFESC-1 1/2-RC  
HFESC-2-RC  
HFESC-2 1/2-HZ EGVE 11/2 C HFESC-1 1/2-HC  
HFESC-2 1/2-HZ EGVE 11/2 C  
HFESC-2-HC  
HFESC-2-HC  
HFESC-2 1/2-HC  
HFESC-3-HC  
HFESC-3-HZ  
HFESC-3-HZ  
HFESC-5 1/2-HZ  
HFESC-5 1/2-HZ  
HFESC-5 1/2-HZ  
HFESC-8-HZ  
SVE 2 C  
SVE 3 C  
SVE 3 C  
SVE 3 C  
SVE 4 C  
SVE 5 C  
SVE 5 C  
SVE 8 C  
SVE 8 C  
SVE 10 C  
SVE 10 C  
SVE 10 C  
OVE 15 C  
HFESC-2-RC  
HFESC-3 1/2-RC  
HFESC-3 1/2-RC  
HFESC-3 1/2-RC  
HFESC-5-RC  
HFESC-7-RC  
HFESC-7-RC  
HFESC-10-RC  
HFESC-10-RC  
HFESC-10-RC  
HFESC-10-RC  
HFESC-13-RC  
SSE 6 ZP  
SSE 6 C  
SSE 6 C  
SVE 5 ZP  
SVE 8 ZP  
HFESC-3-HC  
OSE 9 ZP  
OSE 9 ZP  
OSE 9 ZP  
OSE 12 ZP  
OSE 12 ZP  
OSE 12 ZP  
OSE 12 ZP  
OSE 12 ZP  
OSE 21 ZP  
HFESC-5 1/2-HC  
HFESC-5 1/2-HC  
HFESC-5 1/2-HC  
HFESC-8-HC  
HFESC-8-HC  
HFESC-8-HC  
HFESC-10-HC  
HFESC-10-HC  
HFESC-10-HC  
OSE 9 C  
OSE 9 C  
OSE 12 C  
OSE 12 C  
OSE 12 C  
OSE 12 C  
OSE 12 C  
OSE 12 C  
SVE 10 ZP  
OVE 15 ZP  
OVE 15 ZP  
OVE 15 ZP  
OVE 15 ZP  
OVE 20 ZP  
OVE 20 ZP  
OVE 20 ZP  
HFESC-8-HZ  
HFESC-10-HZ  
HFESC-10-HZ  
HFESC-15-HZ  
HFESC-15-HZ  
HFESC-15-HZ  
HFESC-15-HZ  
7
 
Table ꢀ. Evaporator Troubleshooting Chart  
SYMPTOMS  
POSSIBLE CAUSES  
POSSIBLE CORRECTIVE STEPS  
Fan(s) will not operate.  
1. Main switch open.  
2. Blown fuses.  
3. Defective motor.  
1. Close switch.  
2. Replace fuses. Check for short circuits or overload conditions.  
3. Replace motor.  
4. Defective timer or defrost thermostat.  
5. Unit in defrost cycle.  
6. Coil does not get cold enough to reset thermostat.  
4. Replace defective component.  
5. Wait for completion of cycle.  
6. Adjust fan delay setting of thermostat. See Defrost  
Thermostat Section of this bulletin.  
Room temperature too high.  
1. Room thermostat set too high.  
2. Superheat too high.  
3. System low on refrigerant.  
4. Coil iced-up.  
5. Unit cooler located too close to doors.  
6. Heavy air infiltration.  
1. Adjust thermostat.  
2. Adjust thermal expansion valve.  
3. Add refrigerant.  
4. Manually defrost coil. Check defrost controls for malfunction.  
5. Relocate unit cooler or add strip curtain to door opening.  
6. Seal unwanted openings in room.  
Ice accumulating on ceiling  
around evaporator and/or on  
fan guards venturi or blades.  
1. Defrost duration is too long.  
1. Adjust defrost termination thermostat.  
2. Defective defrost thermostat or not adjusted properly.  
3. Replace defective component.  
2. Fan delay not delaying fans after defrost period.  
3. Defective defrost thermostat or timer.  
4. Too many defrosts.  
4. Reduce number of defrosts.  
Coil not clearing of frost during  
defrost cycle.  
1. Coil temperature not getting above freezing point  
during defrost.  
2. Not enough defrost cycles per day.  
3. Defrost cycle too short.  
1. Check heater operation.  
2. Adjust timer for more defrost cycles.  
3. Adjust defrost thermostat or timer for longer cycle.  
4. Replace defective component.  
4. Defective timer or defrost thermostat.  
Ice accumulating in drain pan  
Uneven coil frosting  
1. Defective heater.  
2. Unit not pitched properly.  
3. Drain line plugged.  
4. Defective drain line heater.  
5. Defective timer or thermostat.  
1. Replace heater.  
2. Check and adjust if necessary.  
3. Clean drain line.  
4. Replace heater.  
5. Replace defective component.  
1. Defective heater.  
1. Replace heater.  
2. Relocate evaporator.  
3. Adjust defrost termination setting higher.  
4. Add or replace nozzle with appropriately sized  
orif ice for conditions.  
2. Located too close to door or opening.  
3. Defrost termination set too low.  
4. Incorrect or missing distributor nozzle.  
Replacement Parts by  
Commercial Refrigeration Parts  
InterLink is your link to a complete line of dependable and certified commercial refrigeration parts, accessories and innovative electronic controls for all Heatcraft  
Refrigeration Products (HRP) brands - including Bohn, Larkin, Climate Control and Chandler. At InterLink, we provide our wholesalers with a comprehensive  
selection of product solutions and innovative technologies for the installed customer base. And every product is built to ensure the same high performance  
standards with which all HRP brands are built — backed by a dedicated team to serve every customer need, delivering at the best lead times in the industry.  
Replacement parts should be obtained from your local InterLink wholesaler. Replacement parts, which are covered under the terms of the warranty statement  
on page 2 of this manual, will be reimbursed for total part cost only. The original invoice from the parts supplier must accompany all warranty claims for  
replacement part reimbursement. Heatcraft Refrigeration Products reserves the right to adjust the compensation amount paid on any parts submitted  
for warranty reimbursement when a parts supplier's original invoice is not provided with a claim. For more information, call 800-ꢂ8ꢂ-7278 or visit  
for our complete Refrigeration Systems Installation and Operation Manual (H-IM-ꢂꢁL).  
Defrost Thermostat  
Expansion Valves & Nozzles  
Refrigerant Oils  
Recommended Refrigerant Piping Practices  
Line Sizing Charts  
Hot Gas Defrost Systems  
Evacuation and Leak Detection  
Refrigerant Charging Instructions  
System Balancing — Compressor Superheat  
General Sequence and Operation  
Troubleshooting Guides  
Preventive Maintenance Guidelines  
Typical Wiring Diagrams  
Since product improvement is a continuing effort, we reserve the right to make changes in specifications without notice.  
The name behind the brands you trust.™  
CLIMATE  
Commercial Refrigeration Parts  
CONTROL  
 
H-IM-UC-0808  

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