Weil-McLain SERIES 2 LGB-7 - Manual (Page 2)

Part Number 550-141-797/0798 2
LGB-6 to LGB-23 Series 2 – Control Supplement
New installation
I
1. Remove all burners from base box assembly. Remove 3.95 mm natural gas main burner
orifices in manifold. Install 2.40 mm propane gas main burner orifices. Use pipe dope
sparingly only on male ends. Use pipe dope compatible with propane gases. Do not
overtighten orifices.
2. Install pilot burners and flame sensor(s). See Figures 1 and 2 (page 3). Follow Table 1 for
electronic pilot burner (UCS), standing pilot burner (Q327) and flame sensor locations on
manifold.
3. Install gas controls and ignition control panel as shown in Table 2, below and either Figure
5 (page 10) or Figure 6 (page 11).
4. Attach pilot switch box to interior jacket panel. See Figure 5 (page 10) or Figure 6 (page
11). Connect thermocouple from standing pilot to switch box. Cut 60” pilot tubing into 2
pieces to make connections from pilot valve to pilot switch box and from pilot switch box
to standing pilot.
5. LGB-21 through LGB-23 require High Gas Pressure Switch Control Carton furnished
with boilers. Attach pressure switch to interior jacket panel. See Figure 5 (page 10) or
Figure 6 (page 11).
6. Attach:
a. 550-223-710 label at boiler operating instruction label. Place so that this label reads
first.
b. 550-223-796 label at rating label.
c. Wiring diagram on door (one on each base).
d. Canada only - mount rating plate on interior jacket panel.
Table 1
Pilot burner and flame sensor
locations
I‚Ã I‚Ã! I‚Ã I‚Ã! I‚Ã I‚Ã! I‚Ã I‚Ã! I‚Ã I‚Ã! I‚Ã I‚Ã!
GB7% ! ( % GB7 $ ! % " !& ' !!
GB7& ! & GB7 % ! ' $ !( ( !#
GB7' ! " ' GB7 & ! ' $ " ( !$
GB7( ! $ ( GB7 ' ! ! % "" ( !&
GB7 ! % ( GB7 ( ! ! % "# ( !&
GB7 ! % ( GB7! ! !! % "% ( !(
GB7 ! ! % ( GB7! ! !! % "% ( !(
GB7 " ! # !" & ( GB7!! ! !# % "' ( "
GB7 # ! % " !$ ' ! GB7!" ! !# % "' ( "
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@yrp‡ ‚vp
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Qvy‚‡Ã7ˆ r T‡hqvt
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H‚qryÃ
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Table 2
Gas control arrangement Grs‡Ãih†r Svtu‡Ãih†r Grs‡Ãih†r Svtu‡Ãih†r
GB7% 6ÃhqГ7 Е GB7 $ E Е Е
GB7& 6ÃhqГ7 Е GB7 % E Е Е
GB7' 8ÃhqГ9 Е GB7 & E Е Е
GB7( 8ÃhqГ9 Е GB7 ' F ГуЕ Е
GB7 @ÃAÃhqГB ГуЕ GB7 ( G ГуЕ ГуЕ
GB7 @ÃAÃhqГB ГуЕ GB7! G ГуЕ ГуЕ
GB7 ! @ÃAÃhqГB ГуЕ GB7! G ГуЕ ГуЕ
GB7 " C Е Е GB7!! G ГуЕ ГуЕ
GB7 # D Е Е GB7!" G ГуЕ ГуЕ
Q ‚ƒhr
8h ‡‚ Dyr‡ÃQvƒrÃTv“r
7‚vyr
H‚qry
Iˆ€ir
Q ‚ƒhr
8h ‡‚ Dyr‡ÃQvƒrÃTv“r
7‚vyr
H‚qry
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