RefPlus LS Series User manual

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COMMERCIAL
WALK-IN EVAPORATORS
LS-LV-LA-LP SERIES
INSTALLATION, OPERATION
AND MAINTENANCE
MANUAL
AWEF
REGISTERED

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TABLE OF CONTENTS
1. SAFETY CONSIDERATIONS.............................................................................................................................. 4
2. INTRODUCTION ..................................................................................................................................................... 4
3. PRODUCT DESCRIPTION .................................................................................................................................. 4
4. NOMENCLATURE .................................................................................................................................................. 5
5. HANDLING AND RIGGING.................................................................................................................................. 6
5.1 STANDARD UNIT WEIGHTS ................................................................................................................................. 7
5.2 R-448A OPERATING CHARGES............................................................................................................................ 7
6. INSTALLATION ........................................................................................................................................................ 8
6.1 COMPLETE PRE-INSTALLATION INSPECTION ................................................................................................... 8
6.2 INSTALLATION LOCATION .................................................................................................................................... 8
6.3 MOUNTING............................................................................................................................................................. 8
6.4 CONNECTING DRAIN LINE ................................................................................................................................... 10
6.5 CONNECTING REFRIGERANT LINES .................................................................................................................. 10
6.6 CONNECTING THE EXPANSION VALVE .............................................................................................................. 11
6.7 BULB LOCATION AND INSTALLATION.................................................................................................................. 11
6.8 SUCTION LINE CONSTRUCTION ......................................................................................................................... 12
6.9 EXTERNAL EQUALIZER LOCATION ..................................................................................................................... 14
6.10 FIELD WIRING...................................................................................................................................................... 14
7. START UP.................................................................................................................................................................. 15
7.1 LEAK TESTING AND EVACUATION....................................................................................................................... 15
7.2 FAN MOTORS......................................................................................................................................................... 15
7.3 FAN DELAY DEFROST TERMINATION CONTROL............................................................................................... 15
7.4 FAN DELAY DRAIN PAN CONTROL ...................................................................................................................... 15
7.5 ADJUSTING EVAPORATOR PRESSURE AND SUPERHEAT ............................................................................... 15
8. DEFROST SYSTEM............................................................................................................................................... 16
8.1 AIR DEFROST UNITS. ........................................................................................................................................... 16
8.2 ELECTRIC DEFROST UNITS................................................................................................................................. 16
8.3 REVERSE CYCLE HOT GAS DEFROST UNITS. .................................................................................................. 16
8.4 THREE PIPE HOT GAS DEFROST UNITS ............................................................................................................ 16
9. SERVICE.................................................................................................................................................................... 17
9.1 INITIAL INSPECTION ............................................................................................................................................. 17
9.2 PERIODIC INSPECTIONS...................................................................................................................................... 17
9.3 CLEANING .............................................................................................................................................................. 17
10. TROUBLESHOOTING CHART ........................................................................................................................ 18
11. REPLACEMENT PARTS..................................................................................................................................... 18
12. EVAPORATOR START-UP REPORT FORM............................................................................................... 19
13. WIRING DIAGRAMS............................................................................................................................................ 21
13.1 LSA-LVA-LAA-LPA MODELS - AIR DEFROST ...............................................................................................................21
13.2 LVA-LAA-LPA MODELS - AIR DEFROST .......................................................................................................................24
13.3 LSE-LVE-LAE-LPE MODELS - ELECTRIC DEFROST...................................................................................................27
13.4 LVE-LAE-LPE MODELS - ELECTRIC DEFROST...........................................................................................................29
13.5 LSR-LST MODELS - HOT-GAS DEFROST ....................................................................................................................31
13.6 LV-LA-LP MODELS - HOT-GAS DEFROST....................................................................................................................32
13.7 LS-LV-LA-LP MODELS - HOT-GAS DEFROST ..............................................................................................................34
14. PIPING DIAGRAMS............................................................................................................................................. 35
14.1 TYPICAL PIPING DIAGRAM FOR LSR-LST MODELS - HOT-GAS DEFROST (STANDARD)......................................35
14.2 TYPICAL PIPING DIAGRAMS FOR LSR-LST MODELS - HOT-GAS DEFROST
(WITH OPTIONAL TXV MOUNTED)..................................................................................................................... 35
14.3 TYPICAL PIPING DIAGRAM FOR ALL LV-LA-LP MODELS - HOT-GAS DEFROST (STANDARD) ..............................36
1 4.4 TYPICAL PIPING DIAGRAMS FOR ALL LV-LA-LP MODELS - HOT-GAS DEFROST
(WITH OPTIONAL TXV MOUNTED)..................................................................................................................... 35
GENERAL WARRANTY............................................................................................................................................. 37

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1. SAFETY CONSIDERATIONS
Installing, starting up, and servicing equipment can be
hazardous due to system pressures, electrical components
and equipment location (elevated structures, etc.). Only
trained and qualied installers as well as service technicians
should install, start-up and service this equipment.
When working on the equipment, observe precautions found
in the literature, on the tags, stickers, and labels attached to
the equipment.
Follow all safety codes. Wear safety glasses and work gloves.
Keep quenched cloths and re extinguisher nearby when
brazing. Use care in handling, rigging, and setting bulky
equipment. Units are factory pressurized with dry air at
approximately 40 psig. Be careful when opening the circuit.
If no pressure is present, check for leaks or loose valves. Work
in a well-ventilated location when using refrigerant.
WARNING! Before installation, always check to
make sure main power to systems is OFF.
Electrical shock can cause personal injury or
death.
2. INTRODUCTION
These instructions describe installation, start-up and service
of refrigeration duty, commercial evaporator units.
3. PRODUCT DESCRIPTION
LS,LV,LA and LP series are ceiling-mounted commercial,
AWEF registered, walk-in evaporators. Each unit includes
a wiring diagram that meets the customer’s requirements.
The wiring diagram displays all the components with all the
necessary protections and controls.
LS series are single-coil construction for an air distribution
towards the centre of the cooler and freezer. The fans draw
air from the evaporator coil and discharge it through the fan
guards at the front of the unit.
LV, LA and LP series are dual-coil construction for an equal
air distribution on both sides of the unit. The fans draw air
upward through the fan guards and discharge it through each
evaporator coil.
For all series, coils are manufactured with seamless deoxidized
heavy wall smooth copper tubes and aluminum plate ns.
For a maximum heat transfer, the tubes are mechanically
expanded into self-spaced plate ns with full collar for a
permanent bond.
Connections and bends are brazed with high-temperature
brazing alloy. Coils are factory leak tested at 300 psig and
purged with a -40°F dew point dry air. Coils are ready for
HFC, HFO and CO 2 refrigerants and are provided with sweat
type connections (several coating materials are available).
All units are modular design and use a minimum amount of
parts for easy part replacement and availability.
Controls, motors and heaters are factory wired to provide a
fully automatic operation of the unit.
Casing for LS, LA and LP models is made from heavy-gauge
stucco aluminum. The LV model has a heavy-gauge painted
aluminum casing.
All units come with stainless steel or plated hardware for a
lightweight and rustproof assembly. Other optional materials
are available.
LS,LA and LP series are provided with removable
3/4” MPT drain ttings for easy installation and cleaning when
installed with a drain union. The LV series is provided with
removable 7/8” female pipe thread drain ttings.
All units are equipped with twin-speed or high-speed EC fan
motors.
All standard LSE, LVE, LAE and LPE models are provided
with a defrost termination switch, heater safety thermostat
and fan delay thermostat. All units feature incoloy low watt
density tubular heaters. They are embedded within the coil for
positive defrost and high-energy efciency. This allows heat
gain reduction in coolers and freezers. They are available for
208-240/3/60, 480/3/60 and 575/3/60. 240/3/60 and 480/3/60
can be used on 200/3/50 and 380/3/50. All units use proper
number of heaters for an even phase loading. Refer to the
wiring diagrams (Section 13) for heater arrangement.
LVG,LVH,LAG,LAH,LPG and LPH models are provided
with fan motor contactors, heater contactors, drain pan heater
safety, fan delay and defrost termination thermostats. These
thermostats sense the coil temperature and control the
operation of fans and heaters. All units feature incoloy low
watt density tubular heaters in the drain pan.
The LST model is provided with fan delay, defrost termination
thermostat and hot-gas defrost pan grid.

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4. NOMENCLATURE
OPTIONS #2A
W = Water / glycol mixture
VOLTAGE
1 = 120/1/60
2 = 240/1/60
5 = 208-240/3/60
8 = 575/3/60
9 = 480/3/60
2350 = 235 000 BTU/H
043 = 4300 BTU/H
MODEL NUMBER / NOMINAL CAPACITY @ 10°FTD
UNIT SERIES
LA = Low air walk-in
LP = Low profile walk-in
LS = Low silhouette walk-in
LV = low velocity walk-in
DEFROST TYPE
MODEL GENERATION
A = Air defrost
E = Electric defrost
G = Reverse cycle defrost with electric drain pan
H = Three-pipe defrost with electric drain pan
R = Reverse cycle defrost with hot gas drain pan
T = Three-pipe defrost with hot gas drain pan
0-6 = Conventional refrigerant generation
7-9 = CO2generation
OPTIONS
A = AWEF compliant
L = Low speed
S AL 235 L0 8 W
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5. HANDLING AND RIGGING
Good handling and rigging practices must be followed to
protect units from damage. Having proper handling equipment
at the job site is most important and it should be planned.
In the US, follow OSHA 1926.251 standard for Rigging
Equipment and Material Handling.
In Canada, follow your province’s requirements for
hoisting and rigging.
Improper rigging of a load or a rigging failure
can expose riggers and other workers nearby to
a variety of potential hazards.
Always lift units secured to the fork lift to
prevent it from slipping off.
Your unit is shipped crated on a pallet. This prevents any
damage to the drain pan underneath. To fasten the unit to the
ceiling, it is recommended to leave it on the pallet in order to
securely lift it up with a motorized or hand-operated forklift.
Do not use a forklift against sheet metal panels or coils. Make
sure forks extend the entire length of the unit and against a
structural part or frame.
On LS models, use the provided support brackets to bolt the
unit to the ceiling. On LV, LA and LP models, use the holes
provided in the unit's frame, as shown below.
This procedure is for reference only. Rigging and handling
procedures will vary from one machine to another and from
one site to another.
Equipment handling and rigging should be
carried out by a certied operator.
LS
LV
LA-LP
Figure 1 Securing unit to ceiling
HANDLING AND RIGGING

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STANDARD UNIT WEIGHTS / OPERATING CHARGES
5.1 STANDARD UNIT WEIGHTS (LB.)
MODEL SHIPPING
WEIGHT MODEL SHIPPING WEIGHT MODEL SHIPPING WEIGHT
LSA-0451 26 LSE-0431 27 LSR/LST-0431 28
LSA-0551 29 LSE-0521 30 LSR/LST-0521 31
LSA-0651 30 LSE-0621 31 LSR/LST-0621 32
LSA-0751 38 LSE-0721 40 LSR/LST-0721 41
LSA-0921 42 LSE-0881 44 LSR/LST-0881 45
LSA-1081 42 LSE-1031 44 LSR/LST-1031 45
LSA-1301 47 LSE-1241 49 LSR/LST-1241 51
LSA-1401 58 LSE-1331 60 LSR/LST-1331 63
LSA-1601 67 LSE-1521 70 LSR/LST-1521 72
LSA-1901 68 LSE-1801 71 LSR/LST-1801 73
LSA-2301 88 LSE-2201 92 LSR/LST-2201 95
LSA-2601 89 LSE-2401 93 LSR/LST-2401 96
LSA-3201 108 LSE-3001 112 LSR/LST-3001 116
LSA-3901 127 LSE-3701 132 LSR/LST-3701 136
MODEL SHIPPING
WEIGHT MODEL SHIPPING WEIGHT MODEL SHIPPING WEIGHT
LVA-0700 110 LVE-0700 120 LVG/LVH-0700 114
LVA-0800 118 LVE-0800 130 LVG/LVH-0800 122
LVA-0900 141 LVE-0900 154 LVG/LVH-0900 145
LVA-1200 159 LVE-1200 177 LVG/LVH-1200 165
LVA-1500 179 LVE-1500 197 LVG/LVH-1500 185
LVA-1900 195 LVE-1900 217 LVG/LVH-1900 201
LVA-2400 254 LVE-2400 282 LVG/LVH-2400 262
LVA-2700 298 LVE-2700 325 LVG/LVH-2700 306
LVA-3000 323 LVE-3000 356 LVG/LVH-3000 331
LVA-3600 352 LVE-3600 390 LVG/LVH-3600 360
LVA-4200 396 LVE-4200 440 LVG/LVH-4200 404
MODEL SHIPPING
WEIGHT MODEL SHIPPING WEIGHT MODEL SHIPPING WEIGHT
LAA-0601 96 LAE-0571 107 LAG/LAH-0571 99
LAA-0751 113 LAE-0721 126 LAG/LAH-0721 116
LAA-0951 120 LAE-0901 133 LAG/LAH-0901 123
LAA-1201 158 LAE-1141 174 LAG/LAH-1141 165
LAA-1501 168 LAE-1431 184 LAG/LAH-1431 173
LAA-1801 215 LAE-1701 241 LAG/LAH-1701 222
LAA-2401 265 LAE-2301 298 LAG/LAH-2301 277
LAA-2801 310 LAE-2701 350 LAG/LAH-2701 335
LAA-3001 255 LAE-2861 288 LAG/LAH-2861 268
LAA-3601 302 LAE-3431 342 LAG/LAH-3431 327
LAA-4201 302 LAE-4001 335 LAG/LAH-4001 315
LAA-4601 355 LAE-4381 395 LAG/LAH-4381 380
MODEL SHIPPING
WEIGHT MODEL SHIPPING WEIGHT MODEL SHIPPING WEIGHT
LPA-0601 95 LPE-0571 105 LPG/LPH-0571 96
LPA-0701 105 LPE-0671 118 LPG/LPH-0671 107
LPA-0801 110 LPE-0761 123 LPG/LPH-0761 112
LPA-1001 145 LPE-0951 161 LPG/LPH-0951 149
LPA-1201 152 LPE-1151 168 LPG/LPH-1151 156
LPA-1601 195 LPE-1521 221 LPG/LPH-1521 200
LPA-2001 240 LPE-1901 273 LPG/LPH-1901 247
LPA-2101 168 LPE-2001 184 LPG/LPH-2001 172
LPA-2401 282 LPE-2301 322 LPG/LPH-2301 290
LPA-2801 216 LPE-2701 242 LPG/LPH-2701 221
LPA-3501 266 LPE-3341 299 LPG/LPH-3341 273
LPA-4201 315 LPE-4001 355 LPG/LPH-4001 323
5.2 R-448A OPERATING CHARGES (LB.)
MODEL OPERATING
CHARGE MODEL OPERATING CHARGE MODEL OPERATING CHARGE
LSA-0451 0.85 LSE-0431 0.71 LSR/LST-0431 0.85
LSA-0551 1.29 LSE-0521 1.15 LSR/LST-0521 1.29
LSA-0651 1.29 LSE-0621 1.15 LSR/LST-0621 1.29
LSA-0751 1.27 LSE-0721 1.05 LSR/LST-0721 1.27
LSA-0921 1.9 LSE-0881 1.68 LSR/LST-0881 1.9
LSA-1081 1.9 LSE-1031 1.68 LSR/LST-1031 1.9
LSA-1301 2.31 LSE-1241 2.05 LSR/LST-1241 2.31
LSA-1401 2.22 LSE-1331 1.85 LSR/LST-1331 2.22
LSA-1601 3.34 LSE-1521 2.97 LSR/LST-1521 3.34
LSA-1901 3.34 LSE-1801 2.97 LSR/LST-1801 3.34
LSA-2301 4.36 LSE-2201 3.87 LSR/LST-2201 4.36
LSA-2601 4.36 LSE-2401 3.87 LSR/LST-2401 4.36
LSA-3201 5.38 LSE-3001 4.8 LSR/LST-3001 5.38
LSA-3901 6.43 LSE-3701 5.7 LSR/LST-3701 6.43
MODEL OPERATING
CHARGE MODEL OPERATING CHARGE MODEL OPERATING CHARGE
LVA-0700 3.17 LVE-0700 4.77 LVG/LVH-0700 3.17
LVA-0800 4.24 LVE-0800 6.72 LVG/LVH-0800 4.24
LVA-0900 4.58 LVE-0900 6.92 LVG/LVH-0900 4.58
LVA-1200 6.14 LVE-1200 9.69 LVG/LVH-1200 6.14
LVA-1500 6.04 LVE-1500 9.06 LVG/LVH-1500 6.04
LVA-1900 8.04 LVE-1900 12.66 LVG/LVH-1900 8.04
LVA-2400 10.03 LVE-2400 16.27 LVG/LVH-2400 10.03
LVA-2700 9.3 LVE-2700 14.52 LVG/LVH-2700 9.3
LVA-3000 12.37 LVE-3000 20.12 LVG/LVH-3000 12.37
LVA-3600 14.86 LVE-3600 24.55 LVG/LVH-3600 14.86
LVA-4200 17.68 LVE-4200 29.23 LVG/LVH-4200 17.68
MODEL OPERATING
CHARGE MODEL OPERATING CHARGE MODEL OPERATING CHARGE
LAA-0601 1.27 LAE-0571 0.83 LAG/LAH-0571 1.27
LAA-0751 2.29 LAE-0721 1.8 LAG/LAH-0721 2.29
LAA-0951 3.07 LAE-0901 2.58 LAG/LAH-0901 3.07
LAA-1201 3.36 LAE-1141 2.58 LAG/LAH-1141 3.36
LAA-1501 4.43 LAE-1431 3.7 LAG/LAH-1431 4.43
LAA-1801 5.8 LAE-1701 4.87 LAG/LAH-1701 5.8
LAA-2401 7.21 LAE-2301 5.99 LAG/LAH-2301 7.21
LAA-2801 8.57 LAE-2701 7.11 LAG/LAH-2701 8.57
LAA-3001 7.21 LAE-2861 5.99 LAG/LAH-2861 7.21
LAA-3601 8.57 LAE-3431 7.11 LAG/LAH-3431 8.57
LAA-4201 10.76 LAE-4001 9.6 LAG/LAH-4001 10.76
LAA-4601 12.86 LAE-4381 11.4 LAG/LAH-4381 12.86
MODEL OPERATING
CHARGE MODEL OPERATING CHARGE MODEL OPERATING CHARGE
LPA-0601 1.27 LPE-0571 0.83 LPG/LPH-0571 1.27
LPA-0701 1.56 LPE-0671 1.02 LPG/LPH-0671 1.56
LPA-0801 2.05 LPE-0761 1.56 LPG/LPH-0761 2.05
LPA-1001 2.24 LPE-0951 1.46 LPG/LPH-0951 2.24
LPA-1201 2.97 LPE-1151 2.24 LPG/LPH-1151 2.97
LPA-1601 3.9 LPE-1521 2.92 LPG/LPH-1521 3.9
LPA-2001 4.77 LPE-1901 3.6 LPG/LPH-1901 4.77
LPA-2101 4.43 LPE-2001 3.7 LPG/LPH-2001 4.43
LPA-2401 5.7 LPE-2301 4.29 LPG/LPH-2301 5.7
LPA-2801 5.8 LPE-2701 4.87 LPG/LPH-2701 5.8
LPA-3501 7.21 LPE-3341 5.99 LPG/LPH-3341 7.21
LPA-4201 8.57 LPE-4001 7.11 LPG/LPH-4001 8.57

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6. INSTALLATION
6.1 COMPLETE PRE-INSTALLATION INSPECTION
Check all items against the bill of lading to make sure all
crates and boxes have been received. Check unit for possible
damage incurred during shipment. Check for concealed
damage. If there is any shortage or damage, le a freight
claim immediately with the transport company. Do
not return damaged equipment to the factory without prior
approval. A Return Material Authorization (RMA) must be
obtained in advance. Items returned without an RMA label
will be refused. Also verify that the nameplate electrical
requirements match the available power supply.
All RefPlus evaporators are pressurized with dry air. A
lack of pressure does not indicate a leak. Check the coil
for possible leaks before installing or returning the unit.
The following essential rules should be complied with
when installing the unit:
• All circuits, including controls and safety switches, must
be correctly connected according to the wiring diagram
supplied with the unit and/or found in this manual.
• The factory wiring cannot be modied without RefPlus'
written approval.
• All units and equipment must be installed with the
specied clearances.
• System piping must be in accordance with proper
refrigeration practices.
• Inert gas must be charged into the system piping during
brazing.
6.2 INSTALLATION LOCATION
All units should be installed ush against the ceiling. The
unit must be level in all directions to ensure proper drainage
of condensate. Refer to Figure 2 and Figure 3 for unit
clearance information.
When deciding on the location of the unit, consider the
following:
• Location of aisle racks
• Location relative to compressor for minimum pipe runs
• Location of condensate drains for minimum run
• The air pattern must cover the entire room
• Never locate units over doors or door openings
• Allow sufcient space between rear of unit and wall to
permit free return of air
IMPORTANT: Avoid placement of the unit directly above
doors and door openings where low temperature is being
maintained. Position the unit so the discharge air blows above
the doors. Install a bafe if door extends above the blower
level. Leave space equal to unit height between bottom of unit
and product. Do not stack product in front of fans.
LS units should be located in a position where the air discharge
is towards the door.
The coil face on units should be away from the wall by:
• LS models: 1/2 coil unit height minimum -
unit height recommended
• LV models: 2 ft minimum - 12 ft maximum
• LA-LP models: 3 ft minimum - 20 ft maximum
NOTE: Units with electric defrost require a minimum clearance
equal to the width (W) of the unit at the left end when
facing the fans to allow removal of defrost heaters,
as shown in Figure 2 and Figure 3.
6.3 MOUNTINGS
Most units can be mounted with either bolts or rod steel
hangers. When mounting unit to ceiling, use Table 1 below
to determine proper rod or bolt size. Use steel rods with a
minimum 9 Kpsi. This information should be used as reference
only.
STEEL ROD
OR BOLT
SIZE
MAXIMUM WEIGHT PER ANCHOR POINT
5/16" 200 lbs
3/8" 300 lbs
1/2" 550 lbs
Table 1 Bolt and rod size chart
The evaporator must be mounted level for proper condensate
draining. Adequate support must be provided to hold the
weight of the unit.
NOTE: The area above the unit must be sealed or
accessible to facilitate hand cleaning without the
use of tools in order to comply with National
Sanitation Foundation (NSF) Standard 7.
INSTALLATION

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1/2 H min.
1 H recommended
3’ min.
(W for units
w/electric defrost)
(W for units
w/electric defrost)
Air
Flow
W
3’ min.
20’ max.
2’ min.
12’ max.
3’ min.
3’ min.
3’ min.
LS
LV-LA-LP
LV LA-LP
Figure 2 Single-evaporator clearance (H=Height of unit - W=Width of unit)
3’ min.
3’ min. 3’ min.
3’ min.
(W for units
w/electric defrost)
(W for units
w/electric defrost)
3’ min.
(W for units
w/electric defrost)
W min.
Air
Flow
Air
Flow
LS LS
1/2 H min.
1 H recommended
1/2 H min.
1 H recommended
LV-LA-LP LV-LA-LP
LV-LA-LP LV-LA-LP
W W
2’ min.
12’ max.
3’ min.
20’ max.
LV LA-LP
4’ min.
24’ max.
6’ min.
40’ max.
LV LA-LP
Figure 3 Multiple-evaporator clearance (H=Height of unit - W=Width of unit)
INSTALLATION

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6.4 CONNECTING DRAIN LINE
A drain line union is recommended for ease of installation
and future servicing and should be located in close proximity
to the drain pan.
LV: A 7/8" ID removable drain coupling is supplied with each
unit.
LS,LA & LP are supplied with 3/4" MPT connections.
FOR ALL MODELS, connect the drain line as follows:
1. Replace the rubber gasket to prevent condensate
leakage.
2. Locate the union as close to the drain pan as possible.
3. Hand tighten the coupling as shown in Figure 4. DO NOT
use wrench to tighten coupling in place as this could
damage the gasket and cause leaks. Once the coupling
is in place, connect the drain pipe and tighten pipe using
two wrenches as shown. The use of two wrenches will
prevent the coupling from twisting and damaging the unit.
HAND TIGHTEN ONLY
LOCK COUPLING IN PLACE
WHILE TIGHTENING PIPE
Figure 4 Drain pan coupling
4. Sharply pitch the drain line and exit it through the
cooler with a short run.
5. Insulate and seal the drain line where it passes through
the wall.
6. Locate the drain traps in warm ambient air temperature
to prevent freeze-up.
Drain traps on low temperature units must be outside of
refrigerated enclosures. Properly protected from freezing,
copper or steel pipes should be used. Food approved plastic
can also be used for medium temperature coolers above 35°F
(2°C). The drain line must have a minimum of 4’’ per foot
pitch for proper drainage. The unit must be perfectly level in
two directions. The drain line should be at least as large as
the evaporator drain connection. All plumbing connections
should 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 lines must be in a warm ambiance.
We recommend a trap on each evaporator. Traps located
outside the building must be insulated and wrapped with a
drain line heater. When installing the heater, be sure to avoid
overlapping. The heater must be permanently energized. A
heat input of at least 20 W per linear foot of drain line for a
0°F (-18°C) room and 30 W per linear foot of drain line for a
-20°F (-29°C) room should be satisfactory. Always trap drain
lines individually to prevent vapour migration.
6.5 CONNECTING REFRIGERANT LINES
All refrigerant system components must be installed in
accordance with applicable local and national codes using
proper engineering practices. Refer to the piping diagrams
on page 36.
Use top quality refrigeration tubing that is internally free of
dirt, humidity or other contaminants. Unsealed tubing should
not be used. Long radius elbows are recommended.
Dry nitrogen must be swept through the lines while joints are
brazed to avoid oxidation and carbon deposits.
IMPORTANT: A calibrated pressure gauge and regulator must
always be used with nitrogen gas cylinders.
All external piping must be well supported. The unit will not
support external piping or valves.
If the condition arises where the suction line must be raised
to a point higher than the suction connection on the unit, a
suction line trap must be installed on the unit.
Horizontal suction lines should slope away from the evaporator
toward the compressor. Leak check and evacuate the system
using a two-stage deep vacuum pump. Pull and hold for 24
hours a 500 micron vacuum.
INSTALLATION