Laars LT199NRX1 Quick guide

Document 7041
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 01/23

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
9 M10 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
14
12
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):
7mm and 10mm Ratchet, Socket Driver, or Wrench
Phillips Head Screwdriver Rubber Mallet Appropriate
Drill with Assorted Bits M10 or 7/16” Lag or Anchor
Bolts and Washers for Anchoring Rack into Wood or
Concrete
■Preparing for Installation:
Determine the best area to install the rack
system. Ensure the location meets building code
requirements, and that all safety and clearance
requirements for the appliance(s) to be mounted to
the rack are met.
■ Installing the Rack System:
1. Move the rack components to the installation
location. Ensure you have all the components for the
installation. NOTE: DO NOT lose these components.
Replacements ARE NOT included in this kit.
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 install the four(4) Angle
Supports to the two(2) Base Feet. See Figure 1(a).
NOTE: DO NOT fully tighten the screws. Doing so
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.
Replacement bolts are not included in this kit.
CAUTION
will make it difficult
to install the vertical
posts and waste
time.
4. Use a Phillips Head Screwdriver and four(4) M6
Self Tapping Screws, two(2)M10 Hex Bolt, two(2)
M10 Hex Nut, four(4)
M10 Washer to
install the two(2)
Vertical Posts to
the Base Feet. See
Figure 1(b). Tighten
all of the installed
M6 Self Tapping
Screws, M10 Hex Bolt, Nut . Be careful not to strip
the screws.
5. Use a 17mm Ratchet/Socket Driver, wrench, and
the twelve(12) M10 Hex Bolts with included M10
Washers and M10 Hex Nuts to mount two(2)
Base Supports to
each Base Foot
and Vertical Post
assembly. See
Figure 2. NOTE:
Ensure a M10
Washer is installed
between the M10
Hex Bolts and support and between the M10 Hex
Nut and support. It is considered best practice to
install the M10 Hex Bolts from the outside in, with
the M10 Hex Nuts on the interior of the rack.
6. Use a 17mm Ratchet or Socket Driver and wrench
and the four(4) M10 Hex Bolts with included M10
Figure 2 - Intalled Base Support
Figure 1(a) - Intalled Angle Support
Figure 1(b) - Intalled Angle Support

4
NOT fully tighten the screws. Doing so will make it
difficult to install the vertical posts and waste time.
4. Use a Phillips Head Screwdriver and (4) M6 Self
Tapping Screws to install the two(2) Vertical Posts to
the Base Feet. See Figure 1. Tighten all twelve(12) of
the installed M6 Self Tapping Screws. Be careful not
to strip the screws.
5. Use a 17mm Ratchet/Socket Driver, wrench, and
the twelve(12) M10 Hex Bolts with included M10
Washers and M10 Hex Nuts to mount two(2) Base
Supports to each Base Foot and Vertical Post
assembly. See Figure 2. NOTE: Ensure a washer is
installed between the bolt and support and between
the nut and support. It is considered best practice to
install the bolts from the outside in, with the nuts on
the interior of the rack.
6. Remove the two(2) M10 Hex Nuts and M10 Washers
attaching the Upper Beam to the installed rack.
Then use a 17mm Ratchet or Socket Driver and
wrench and the those two(2) M10 Hex Nuts and M10
Washers and two(2) M10 Hex Bolts with included
washers and nuts from the Extension Rack kit to
mount the beam marked “UPPER” to the Extension
Rack and installed rack base and post assembly.
7. Remove the two(2) M10 Hex Nuts and M10 Washers
attaching the Lower Beam to the installed rack.
Remove the label that corresponds to the appliance
that will be mounted from the Extension Rack post
assembly. Then use a 17mm Ratchet or Socket
Driver and wrench and the two(2) removed M10 Hex
Nuts and M10 Washers and two(2) M10 Hex Bolts
with included M10 Washers and M10 Nuts from
the Extension Rack kit to mount the beam marked
“LOWER” to the Extension Rack and installed rack
base and post assembly. NOTE: Ensure the lower
beam is mounted in the proper location for the
appliance to be installed to the rack. Failure to do so
will result in wasted time.
8. Use a rubber mallet to
install the end cap on the
vertical post. See Figure
5. If installing a single
Extension Rack, rack
installation is complete.
See Figure 6. Ensure all
nuts and bolts and screws
are tightened.
9. Repeat the steps included
in this Installing an
Extension Rack section
for each additional
Extension Rack. Figure 6 - Installed Main Rack
and Extension Rack
■ Installing an Extension Rack :
1. Move the rack components to the installation
location. Ensure you have all the components for the
installation. NOTE: DO NOT lose these components.
Replacements ARE NOT included in this kit.
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 install the four(4) Angle Supports
to the two(2) Base Feet. See Figure 1. NOTE: DO
Washers and M10 Hex Nuts to mount the beam
marked “UPPER” to each Base and Post assembly.
See Figure 4. NOTE: If installing an Extension
Rack, install the bolts on the exterior vertical post
from inside the post out, and do not tighten down
the bolts. Tighten the nuts by hand to keep the post
stable. See Figure 3.
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. Then use a 17mm Ratchet or Socket
Driver and wrench and the four(4) M10 Hex Bolts
with included M10 Washers and M10 Hex Nuts to
mount the beam marked “LOWER” to each base
and post assembly. NOTE: Ensure the lower beam
is mounted in the proper location for the appliance
to be installed to the rack. Failure to do so will result
in wasted time. NOTE: If installing an Extension
Rack, install the bolts on the exterior vertical post
from inside the post out, and do not tighten down
the bolts. Tighten the nuts by hand to keep the post
stable. See Figure 3.
8. Use a rubber mallet to install
the two(2) End Caps on the
Vertical Posts. See Figure 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
Figure 3 - Open Ended Bolt Figure 4 - Installed Upper Beam

5
■ 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).
Litho in U.S.A. © Laars 23-03 Document 7041