LAARS HEATING SYSTEMS
Page 4
Figure 1. Closet Installation.
TOP
VIEW
SIDE
VIEW
Damage from improper flow is not warranted.
Failure to insure proper water flow through the
heat exchanger of the boiler will void the Laars
warranty. Flow can be verified by measuring the
difference in water temperatures between the boiler
inlet (system return) and outlet (system supply). For
example: For a JV-100 installation, the inlet water
temperature is 160°F (71ºC), and the outlet temp-
erature is 180°F (82ºC). That means there is a 20ºF
(11ºC) temperature rise through the boiler. According
to Table 2, that would indicate a flow rate of 8 gpm
(0.5 l/s). Temperature rise must be measured with the
longest (highest head) zone calling for heat alone.
Other factors to be considered before selecting a
pump are pipe size, the number and type of fittings
throughout the system, smoothness of the interior
surface of the pipe, the quantity of water flowing
through the pipe, whether a glycol solution (for freeze
protection) is being used, and the total length of piping
in the system. Table 3 can help in proper pump
selection.
2
(51)
4
(102)
2
(51)
5
(127)
6
(152)
6
(152)
MIN
1E. Boiler Placement
WARNING
This boiler is intended for indoor installation only.
1.
The boiler must be placed to provide clearances
on all sides for maintenance and inspection.
There must also be minimum distances
maintained from combustible surfaces. Avoid
locations which can be damaged by water or
moisture.
2.
A minimum of 15" (381mm) access must be
available in front of the boiler for burner tray
removal. Consult local codes for clearances to
hot water pipes and accessories.
Table 3. Maximum Suggested Circuit Length in Feet.
3.
If the boiler is to be installed in a garage, all
burners and burner ignition devices must have a
minimum 18" (457mm) clearance above the floor.
4.
The Model JVi-50 through JVi-225 boilers can
be installed in a closet as long as the minimum
clearances shown in Table 4 are observed.
Special attention should be paid to clearances
between the front of the boiler and the closet
door when it is closed (see Figure 1).
Caution
Do not install this boiler in a location subject to
negative pressure, or improper operation will occur.
Table 4. Minimum Boiler Clearances
From Combustible Surfaces.
5. All boilers are designed and certified for
installation on a combustible floor. Ensure that the
boiler is level from all sides. NEVER store objects on
or around the boiler. Boilers must NEVER be installed
on carpeting.
1F. Gas Supply and Piping
Review the following instructions before
proceeding with the installation.
1.
Verify that the boiler is fitted for the proper type
of gas by checking the rating plate. Laars boilers
Dimensions in
inches (mm).
Air
Openings
Boiler
Left
Right
Rear
Front
Flue*
Top
Side
Side
Sizes:
50 to
2"
5"
2"
4"
6"
23"
225
51mm
127mm
51mm 102mm
152mm
584mm
*1" (25mm) clearance using Type B double wall vent pipe.
23
(584)
Size
1/2" Pipe
3/4" Pipe
1" Pipe
1-1/4" Pipe
Pump
H.P.
Pump H.P.
Pump H.P.
Pump H.P.
1/25 1/12 1/25 1/12 1/6 1/25 1/12 1/6 1/25 1/12 1/6
50
50
99
390 680
*
*
*
*
*
*
*
75
*
35
160 300 460 640
*
*
*
*
*
100
*
*
77
150 260 330 620
*
*
*
*
125
*
*
27
80
140 170 360 600
*
*
*
160
*
*
*
25
72
57
160 330 190 480
*
225
*
*
*
*
*
*
*
110
*
69
330
*A circular and/or primary/secondary piping are required. Consult factory.
1. Chart is based on 30°F (17°C) maximum temperature rise.
2. Calculations are based on Type L copper tubing with one zone valve
and eight elbows.
3. Typical circulating pumps: 1/25 HP=Taco 007, B&G LR-20 or SLC-25,
Grundfos UP15-42F, or equivalent. 1/2 HP=B&G LR-12, Grudnfos
U26-42F, or equivalent. 1/6 HP=B&G series HV, Grundfo UP43-75,
or equivalent.
