LAARS Mini-Therm JVS (Sizes 50-225) - Install and Operating Manual - Manual (Page 14)

LAARS Heating Systems Page 14
Figure 8. Gas Supply Piping.
HORIZONTAL
DROP
TO BOILER
SEDIMENT TRAP
OR DRIP LEG
TO BOILER
RISER
SEDIMENT TRAP
OR DRIP LEG
3" (76mm)
MIN.
3" (76mm)
MIN.
1. Gas piping installation must be in accordance
with the latest edition of ANSI Z223.1 and all
local codes. In Canada, the installation must be in
accordance with CSA-B149.1 and all local codes
that apply.
2. Check the gas supply to be sure that it is the
same as the gas indicated on the boiler’s plate.
Mini-Therm JVS and JVH boilers, as shipped
from the factory, are certified to operate within
the altitude range indicated on the rating plate.
If a field conversion to a different altitude range
or different gas should be necessary, conversion
parts are available. Contact a Laars representative
or the factory for the correct part numbers to
order for conversions
Caution
Permanent damage to the gas valve will occur
if the following procedures are not followed.
Attention
Vous endommagerez la soupape de gaz
si vous ne respectez pas les procédures
suivantes.
3. Use the figures in Table 6 to size the gas inlet
piping from the gas meter to the heater. Check all
local codes for compliance before installing the
heater.
Boiler Size
Distance
From Gas
Meter
50 75 100 125 160 225
Pipe Size
0-50
0-15m
1/2 3/4 3/4 3/4 1 1
50-100'
15-30m
3/4 3/4 3/4 1 1 1-1/4
100-200'
30-60m
3/4 1 1 1 1-1/4 1-1/4
* Note: These figures are for Natural Gas (.65 Sp. Gr.), and
are based on 1/2" water column pressure drop. Check supply
pressure with a manometer, and local code requirements for
variations. For LPG, reduce pipe diameter one size, but main-
tain a 1/2" minimum diameter. A 'normal' number of Tees and
elbows have been taken into allowance.
Table 6. Natural Gas Pipe Size Requirements*
Gas Supply
Inlet
Tee
Fitting
3 in.
(76mm) Min.
Cap
Nipple
To Equipment
Inlet
Figure 9. Typical design for a sediment trap/drip leg.
Supply Pressure Minimum Maximum
Natural Gas 5.5 Inches WC 10.5 Inches WC
(1.3 kPa) (2.5 kPa)
LP Gas 10.0 Inches WC 13.0 Inches WC
(2.4 kPa) (3.1 kPa)
Table 5. Gas Supply Pressure Requirements.