Krack KR14E-037 Installation Manual
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KR Electrical Defrost Unit Coolers (PN E108318_E)
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TABLE OF CONTENTS
1 LOCATION RECOMMENDATIONS ......................................................................................... 2
2 UNIT MOUNTING ..................................................................................................................... 2
3 DRAIN LINE .............................................................................................................................. 4
4 REFRIGERATION PIPING ....................................................................................................... 4
5 REFRIGERANT DISTRIBUTOR ............................................................................................... 4
6 EXPANSION VALVE ................................................................................................................ 6
7 WIRING ..................................................................................................................................... 7
8 SEQUENCE OF OPERATION ................................................................................................. 7
9 PRE-STARTUP ......................................................................................................................... 8
10 REPLACEMENT PARTS ........................................................................................................ 12
FIGURES
Figure 1 Unit Dimensions ................................................................................................................... 3
Figure 2 Typical System Wiring 208/230/60/1 (Timer Only) .............................................................. 9
Figure 3 Typical System Wiring 208/230/60/1 (Timer & Defrost Contractor) .................................... 9
Figure 4 Typical System Wiring 208/230/60/3 ................................................................................. 10
Figure 5 Typical System Wiring – Multiple Evaporators 208/230/60/3 ............................................ 10
Figure 6 Typical System Wiring 460/60/1 ........................................................................................ 11
Figure 7 Replacement Parts ............................................................................................................ 12
TABLES
Table 1 Mounting dimensions and sizes of suction, liquid and drain connections. ........................... 3
Table 2 Distributor nozzles selections 5
Table 3 Recommended Expansion valves ......................................................................................... 6
Table 4 Motors and Heaters Electrical Information ............................................................................ 7
Table 5 Replacement Parts.............................................................................................................. 13
KR Electrical Defrost Unit Coolers (PN E108318_E) 1
1 LOCATION RECOMMENDATIONS
Electric defrost unit coolers must have proper airflow to maintain a uniform room temperature and have a
complete defrost.
These units are draw thru design thus drawing air thru the cooling coil and discharging it into the room via
the unit fans. For best performance it is desirable to arrange the air discharge toward the door of the cooler to minimize the entrance of warm moist air when the door is open. The unit must be at least 12 inches
from the wall to assure proper air intake.
2 UNIT MOUNTING
The unit cooler may be suspended with 3/8" diameter hanger rods or flush mounted to the ceiling using
5/16 minimum lag screws with flat washers. Rods should be double nutted top and bottom.
The unit must be level in all directions to insure proper drainage of condensate. Suspended units must
have sufficient clearance above for cleaning the top.
KR Electrical Defrost Unit Coolers (PN E108318_E) 2
Figure 1 Unit Dimensions
MODEL
NUMBERS
DIMENSIONS (INCHES)
CONNECTIONS ODS
(INCH)
A B C
LIQUID
SUCTION
KR14E-037
-
18
29-1/8
1/2
5/8
KR24E-065
-
36
47-1/8
1/2
7/8
KR24E-074
-
36
47-1/8
1/2
7/8
KR34E-111
-
54
65-1/8
1/2
7/8
KR44E-148
36
72
83-1/8
1/2
1-1/8
KR54E-185
36
90
101-1/8
1/2
1-1/8
KR64E-213
54
108
119-1/8
1/2
1-1/8
KR64E-220
54
108
119-1/8
1/2
1-1/8
KR16E-035
-
18
29-1/8
1/2
5/8
KR16E-041
-
18
29-1/8
1/2
5/8
KR16E-045
-
18
29-1/8
1/2
5/8
KR26E-067
-
36
47-1/8
1/2
7/8
KR26E-075
-
36
47-1/8
1/2
7/8
KR26E-090
-
36
47-1/8
1/2
7/8
KR36E-126
-
54
65-1/8
1/2
7/8
KR36E-135
-
54
65-1/8
1/2
7/8
KR46E-160
36
72
83-1/8
1/2
1-1/8
KR46E-180
36
72
83-1/8
1/2
1-1/8
KR56E-192
36
90
101-1/8
1/2
1-1/8
KR66E-240
54
108
119-1/8
1/2
1-1/8
KR66E-270
54
108
119-1/8
1/2
1-1/8
Table 1 Mounting dimensions and sizes of suction, liquid and drain connections.
KR Electrical Defrost Unit Coolers (PN E108318_E) 3
3 DRAIN LINE
The drain line should be as short and as steeply pitched as possible with a minimum of 1/4" drop per running foot. Any traps in the drain line must be located in an ambient above freezing. If the temperature surrounding the trap or drain line is below freezing it must be wrapped with a drain line heater. Be sure to
also wrap the unit drain coupling. Cover the drain line, drain coupling and heat tape with insulation. Be
sure to follow the manufacturer's recommendation when installing the drain line heat tape.
A union is recommended for ease of installation and future servicing. The union should be located as
close to the drain pan as possible. Use two wrenches when tightening to prevent the drain fitting from
twisting and damaging the unit.
Support long runs of drain line (i.e. more than a few feet) by hangers to avoid damage to the drain pan.
4 REFRIGERATION PIPING
System design must conform to all codes, laws and regulations applying to the site of installation. In addition the safety code for mechanical refrigeration.
Refrigerant line sizes and piping techniques should be obtained from the ASHRAE Guide or equivalent
reference. Under no circumstances should the refrigerant connection size of the unit be used as the basis
for sizing the lines.
The horizontal suction line should slope away from the unit toward the compressor. Vertical suction risers
may require a trap at the bottom of the riser for proper oil return.
For Food Service installations – seal any joint between unit cooler and cooler wall with a sealant Listed by
the National Sanitation Foundation.
5 REFRIGERANT DISTRIBUTOR
Distributor nozzles are included using a refrigerant distributor with a changeable nozzle design. The
nozzle(s) are packed in individual plastic envelopes along with a retainer ring and instruction card. The
instruction card tells what refrigerant the nozzle is to be used with. There may be 1, 2 or 3 envelopes with
nozzles located near the distributor.
The nozzles provided with the unit have been selected for design conditions of 9°F to 11°F T.D. and 95°F
liquid refrigerant at the expansion valve inlet. If the unit will be operated at conditions that are substantially different from these conditions, it may be necessary to select a different size nozzle. Contact the factory
for advice.
The nozzle must be installed before the expansion valve is installed. There are nozzle identification numbers stamped on one side of the nozzle. Be sure to insert the nozzle into the distributor with these
numbers visible in case identification is required later. The nozzle is held in place by a retainer ring that is
easily inserted or removed with a pair of needle nose pliers.
The standard distributor nozzles provided with the units are listed in Table 2.
KR Electrical Defrost Unit Coolers (PN E108318_E) 4
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