Laars LT199NRX1 Quick guide

Base Rack : ST1249 Extension Rack : ST1250
Installation and Instruction Manual
Cascade Rack
System
Model LT199NXX1 / LT199PXX1
LT199NRX1 / LT199PRX1
RTGS199N1 / RTGS199X1
RTGR199N1 / RTGR199X1
Base Rack : ST1249
Extension Rack : ST1250
FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,
qualied in hot water boiler and heater installation and maintenance. Improper installation and/or
operation could create carbon monoxide gas in ue gases which could cause serious injury, property
damage, or death. Improper installation and/or operation will void the warranty.
Installation and Instruction Manual Cascade Rack System S633100214 Rev 09/23

2
This installation shall be done by a qualied service agency in accordance with these instructions, the installation manual included with
the appliance to be mounted on this rack, all applicable codes, and requirements of the authority having jurisdiction. Failure to follow
these instructions could result in substantial property damage, severe personal injury, or death.
STOP! Follow these instructions or warranty will be void!
■Installation Must Comply With:
1. This appliance must be installed in accordance with local codes if any; if not, follow ANSI Z223.1/NFPA 54 or
CAN/CSA B149.1, Natural Gas and Propane Installation Code, as applicable.
2. Local, state, provincial, and national codes, laws, regulations,and ordinances. This installation shall be done by a
qualied service agency in accordance with these instructions, the installation manual included with the appliance
to be mounted on this rack, all applicable codes, and requirements of the authority having jurisdiction. Failure to
follow these instructions could result in substantial property damage, severe personal injury, or death.
Included with Kit:
4
6
7
5
1
2
WARNING
No Description
Quantity
Main
Rack
Extension
Rack
1Base Foot 2 1
2Base Support 4 2
3Angle Support 4 2
4Vertical Post 2 1
5 Lower Beam 1 1
6Upper Beam 1 1
7 End Cap 2 1
8 M10 Washer 44 24
9M10 Hex Screw 22 12
10 M10 Hex Nut 22 12
11 M6 Self Tapping Screw 8 8
12 M6 Hex Screw 4 3
13 M6 Hex Nut 4 3
14 M6 Washer 8 6
13
12
14
Figure B
Figure A
Figure C
Figure A Figure B Figure C
9
10
8
3
11

3
NOTICE
Remove all items from the packaging and ensure that all parts
and accessories are included in the kit. Any claims for damage
or shortage in shipment must be led immediately against the
transportation company by the consignee.
■Tools Required (Not Included):
- 7 mm and 10 mm wrench
- Phillips head screwdriver
- Rubber Mallet
- Drill and proper bolts or anchors for attaching to the
floor(refer to local codes).
■Preparing for Installation:
Determine the best area to install the rack system.
Ensure the location meets all code requirements,
and that all safety and clearance requirements for
the appliance(s) to be mounted to the rack are met,
refer to installation manual.
■ Installing the Rack System:
1. Move the rack components to the installation
location. Ensure you have all the components for the
installation.
2. Set the base feet in the installation location. Verify
finished installation clearances will meet the service
clearance requirements of the appliance(s) to be
mounted on the rack.
3. Use a Phillips Head Screwdriver and eight(8) M6
Self Tapping Screws to loosely install the four(4)
Angle Supports to the two(2) Base Feet. See Figure
1(a).
Installer - Read all instructions in this manual before
installing. Perform steps in the given order. Obey all local
codes. Obtain all applicable permits before installing this rack
system.
NOTE: Install all components in such a manner that does not
reduce the performance of any re rated assembly.
User - These instructions are for use only by a qualied
heating installer / service technician.
FAILURE TO ADHERE TO THE GUIDELINES ON THIS PAGE
CAN RESULT IN SUBSTANTIAL PROPERTY DAMAGE,
SEVERE PERSONAL INJURY, OR DEATH.
WARNING
This rack system must be properly anchored and secured to
the oor BEFORE mounting appliances on it. Failure to follow
these instructions could result in substantial property damage,
severe personal injury, or death.
WARNING
Carefully consider installation when determining rack location.
Please read the entire appliance installation manual before
installing this rack. Failure to properly take factors such as
appliance venting, piping, condensate removal, and wiring into
account before installation could result in wasted time, money,
and possible property damage and personal injury.
Do not attempt to overtighten any of the bolts as this may
damage the threads and prevent the bolts from turning.
CAUTION
Figure 1(a) - Installed Angle Support
4. Insert the vertical posts between the loose angle
supports. Before tightening the M6 self tapping
screws, insert one M10 Hex Bolt with two M10
washers and M10 Hex Nut as shown in figure 1(b).
Once the M10 bolt is tightened ensure all M6 Self
tapping screws are tightened.
5. Align the Base support on each side of the vertical
posts with the six holes in the vertical post and base
foot. Using one M10 Hex bolt, Two M10 washers,
and one M10 Hex nut for each of the 6 holes.
Tighten the 6 M10 bolts for each vertical post.
Figure 1(b) - Installed Angle Support

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Figure 6 - Installed Main Rack and Extension Rack
■ Installing an Extension Rack :
1. Repeat steps 3, 4, and 5 to assemble the additional
vertical post assembly.
2. Repeat steps 6 and 7 to install the upper and lower
beams on the new vertical post assembly.
3. Attach the new vertical post assembly(with upper
and lower beam) to the base rack using the existing
M10 hex bolts, M10 hex nuts, and washers. Ensure
all bolts are tight.
4. Install any remaining end caps for the new vertical
posts.
5. If required by local code use appropriate anchors for
the flooring material to secure the Rack to the floor.
6. Gather the Upper beam and align the holes. Use
an M10 Hex Bolt, two M10 Washers, and one M10
Hex Nut to loosely attach the upper beam to the
two vertical post as shown in figure 3. If adding an
extension rack insert the M10 Hex Bolt from the
inside toward the extension rack to make adding the
extension easier.
7. Observe the posts. Labels marked “ALL TANKLESS
WATER HEATERS”, “80 – 140kBTU APPLIANCES”,
and “175 – 199kBTU APPLIANCES” cover the
upper lower beam mounting holes. Remove the
label that corresponds to the appliance that will be
mounted. Align the holes from the Lower Beam with
the correct mounting holes for the appliance being
mounted to the rack. Using an M10 hex bolt, two
Figure 3 - Open Ended Bolt
Figure 4 - Installed Upper Beam
Figure 2 - Installed Base Support
M10 washers, and one M10 hex bolt secure the
lower beam to the vertical post through each of the
four mounting holes. If adding an extension rack
insert the M10 Hex Bolt from the inside toward the
extension rack to make adding the extension easier.
8. Use a mallet to
install the end caps
into each vertical
posts as shown in
gure 5.
9. If installing a
single Main Rack,
rack installation is
complete. Ensure
all nuts and bolts
and screws are
tightened.
Figure 5 - Installed End Cap

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■ General Rules for Drilling in Concrete :
Concrete drillers must comply with OSHA’s general
rules. Operators must be adequately trained to use
concrete drilling equipment, and the drilling equipment
must be maintained in safe operating condition.
Operators must wear personal protective equipment
(PPE), including goggles, long pants, protective noise
equipment, and steel-toed work boots. Operators
should wear a respirator whenever exposed to
hazardous materials. Adequate ventilation is required
whenever drilling in concrete.
When locating the rack and preparing to install concrete anchors,
IT IS MANDATORY to check for buried electrical cables, gas
tubing, and water or radiant heating piping. DO NOT drill into
or drive fasteners into concrete slab unless absolutely certain
it is safe to do so. If in doubt, CONSULT A PROFESSIONAL to
determine and accurately locate buried objects. Failure to follow
this warning could result in property damage, serious personal
injury, or death.
WARNING
■General Notes on Securing the Rack to a
Concrete Floor :
This rack system must be properly anchored and secured to
the oor BEFORE mounting appliances on it. Failure to follow
these instructions could result in substantial property damage,
severe personal injury, or death.
WARNING
If seismic anchoring is required, consult state and local codes
for requirements and instructions. If in doubt as to whether
seismic anchoring is necessary in your installation location,
CONSULT A PROFESSIONAL. Failure to follow this warning
could result in property damage, serious personal injury, or
death.
WARNING
■ Installing Appliance(s) on the Rack: :
1. a. If mounting one(1) appliance to the rack, use a
10mm Ratchet or Socket Driver and wrench and
two(2) M6 bolts and included washers and nuts to
mount the top mounting bracket to the upper beam
of the rack. See Figure 7.
1. b. If mounting two(2) appliances to the rack, use a
10mm Ratchet or Socket Driver and wrench and
two(2) M6 bolts and included washers and nuts to
mount two(2) top mounting brackets to the upper
beam of the rack. See Figure 8.
2. Hang the appliance(s) from the top mounting
bracket(s). See Figure 7.
3. Use a 10mm Ratchet/Socket Driver and wrench to
secure the lower mounting bracket(s) to the lower
beam, using the two(2) M6 bolts and the included
washers/nuts. See Figures 9 and 10.
Figure 7 - Single Appliance Mounted on Top Mounting Bracket
Figure 8 - Secured Top Mounting Bracket for Back to Back
Appliance Mounting
■ General Anchoring Instructions :
1. Position the stand in the installation location.
2. Once properly positioned, use a pencil to mark the
drill holes for the lag screws / expansion anchors.
Then move away the stand.
3. Prepare to drill holes into the mounting surface
(either 4” thick minimum Wood Structural Member,
or 4” thick minimum Concrete Flooring). Consult lag
screw or expansion anchor manufacturer for predrill
diameters.
4. After taking appropriate precautions, drill the four
anchor holes.
5. Reposition the stand with attached seismic anchors
over the newly drilled anchor holes.
6. Install the washers and lag screws or expansion
anchors (depending on the installation and code
requirements).
■ Utility Precautions
OSHA rules state that concrete drillers should make
certain they are not drilling into electrical cables. They
should use the services of the underground utility and
cable locating companies prior to drilling. Concrete
drillers should maintain a minimum distance of 10 feet
from high voltage power cables.to install the vertical
posts and waste time.

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Figure 12 - Mounted Back to Back Appliances
Figure 13 - Mounted Side by Side Appliances (Possible with
Extension Rack)
41.3" 25.9"
65.0"
67.7"
48.8"
15.3"
Figure 14 - Rack Dimensions
45.8"
22.9"
Figure 10 - Secured Lower Bracket for Back to Back Appliance
Mounting
Figure 11 - Mounted Single Appliance
Figure 9 - Single Appliance Secured Lower Bracket
4. See Figures 11, 12, 13 for mounted appliance
images.
5. Repeat the previous steps for installing additional
appliances on Extension Rack(s).