LAARS Mighty Therm LO-NOx PH (Sizes 250/400) - Install and Operating Manual - Manual (Page 16)

LAARS Heating Systems
Page 16
Caution
Since some leak test solutions (including soap and
water) may cause corrosion or stress cracking,
rinse the piping with water after testing.
Avertissement
Étant donné que certaines solutions utilisées pour
vérifier les fuites (dont le savon et l’eau) peuvent
causer la corrosion ou la fissuration, rincer les
canalisations avec de l’eau après avoir effectué les
essais.
2.8 Electrical Wiring
WARNING
Electrically ground the boiler in accordance with the
latest edition of the National Electrical Code, ANSI/
NFPA 70. In Canada, use C22.1. Do not rely on the
gas or water piping to ground the metal parts of the
boiler. Often, plastic pipe or dielectric unions isolate
the boiler electrically. Service and maintenance
personnel who work on or around the boiler may be
standing on wet floors and could be electrocuted by
an ungrounded boiler. Electrocution can cause
serious injury or death. The electric circuit to which
the unit will be connected should be “OFF” during
installation and wiring of the unit.
MISE EN GARDE
La chaudière doit être reliée à la terre en respectant
les exigences de la plus récente édition du National
Electrical Code ANSI/NFPA 70.Au Canada, utiliser
le C22.1. Ne pas avoir recours aux canalisations de
gaz ou d’eau pour relier à la terre les pièces
métalliques de la chaudière. Les tuyaux de
plastique ou raccordements diélectriques servent
souvent à isoler la chaudière au point de vue
électrique. Les employés qui sont appelés à
travailler sur la chaudière ou autour pour effectuer
l’entretien et les réparations peuvent se retrouver
sur un plancher mouillé et risquer l’électrocution si
l’appareil n’est pas adéquatement mis à la terre.
L’électrocution peut occasionner des blessures
graves ou la mort. Le circuit électrique auquel
l’appareil est branché doit être en position d’arrêt
« OFF » durant l’installation et le câblage de
l’appareil.
1. Check boiler wiring and pump for correct
voltage, frequency, and phase. Check to make
sure boiler is wired for 120 volts alternating
current (VAC). If 240 VAC, contact local factory
representative or Laars.
2. Wire the boiler and pump exactly as shown in the
wiring diagram supplied with the boiler. See
Figures 30 through 33 for a typical example of a
wiring diagram.
testing of the system at pressures higher than 1/2
pounds per square inch (psi) (3.4 kilopacals
[kPa]). If the test pressure is equal to or less than
1/2 psi (3.45 kPa), close the manual shutoff valve
on the boiler during the piping pressure test.
8. Gas supply pressures to the boiler are listed in
Table 6.
Supply Pressure Natural Gas
Water Column in. mm
Minimum 6 152
See Rating Plate
Maximum 10.5 267
Table 6. Gas Supply Pressure Requirements.
NOTE: The boiler and all other gas appliances sharing
the boiler gas supply line must be firing at maximum
capacity to properly measure the inlet supply
pressure. Low gas pressure could indicate an under-
sized gas meter and/or obstructed gas supply line.
9. Do not exceed the maximum inlet gas pressures
specified. Excessive pressure will result in
damage to the boiler's gas controls. The minimum
pressure specified is for gas input adjustment.
10. The correct burner manifold gas pressure is
stamped on the rating plate. The regulator on the
gas valve is preset at the factory, and does not
normally need adjustment.
11. Before operating the boiler, test the complete gas
supply system and all connections for leaks using
a soap solution.
Figure 26. T-Fitting and Sediment Trap.
MANUAL SHUT-OFF
VALVE
GAS
SUPPLY
INLET
T-FITTING
3" (76 mm)
MIN.
UNION
NIPPLE
CAP
TO
BOILER
INLET
OUT OF
PRODUCTION