Conversion To Propane; Electrical Connections; External Connection Board Connections - Buderus Logamax plus GB142-24 Installation Instructions Manual

7

Electrical connections

3
2
1
Fig. 28 Vertical exhaust and horizontal intake venting system (sealed
combustion)
[1] 3" × 1.5" (80 × 38.1 mm)
[2] Exhaust 3" (80 mm)
[3] 10"- 0" min. (250 mm - 0 mm min.)
[4] 12" (300 mm) over maximum snow level or 24" (600 mm)
whichever is greater
[5] Intake 3" (80 mm)
Do not exceed the total equivalent venting length of 100 feet
(30,480 mm) (GB142-24/30/45) and 60 feet (18,288 mm) (GB142-
60) maximum requirement each for the intake and exhaust piping.
See table 4 for the Friction Loss Equivalent in piping and fittings.
Fittings or Piping
45 degree elbow
90 degree elbow
plastic pipe per foot
concentric vent kit
Table 4 Friction Loss Equivalent in piping and fittings
Example:
When you end up using 3 x 45°-elbows and the concentric vent kit, then
the total venting length may not exceed 88 feet (26.84 m) (GB142-24/
30/45) or 48 feet (14.65 m) (GB142-60).
3 x 45°-elbow = 3 x 3 ft (0.91 m) = 9 ft (2.73 m)
concentric vent kit = 3 ft (0.91 m)
Total friction loss equivalent =12 ft (3.64 m)
Total venting length for this example is:
GB142-24/30/45 = 100 ft (30.48 m) - 12 ft (3.64 m) = 88 feet
(26.84 m)
GB142-60 = 60 ft (18.29 m) - 12 ft (3.64 m) = 48 feet (14.65 m).
NOTICE:
The minimum covering wall thickness is 1" (25 mm).
The maximum covering wall thickness is 16" (406 mm).
18
4
5
72150200-26.1TD
Equivalent
feet m
3 0.91
5 1.52
1 0.30
3 0.91
CAUTION:
Vent connectors serving appliances vented by natural
draft shall not be connected into any portion of
mechanical draft systems operating under positive
pressure.
NOTICE:
▶ For Direct venting properly reassemble and reseal
the vent and air-intake systems.
6.8

Conversion to Propane

To convert the boiler to propane, following the instructions in the
"Propane, Conversion Kit" Instruction manual. Available kits  page 36
"Spare parts", [43].
7 Electrical connections
Devices such as pumps, outdoor sensor and 3-way valve are all
connected to the external connection board.
The electrical connections to the boiler must be made in accordance
with all applicable local codes and the latest revision of the National
Electrical Code, ANSI/NFPA-70.
Installations should also conform with CSA C22. 1 Canadian Electrical
Code Part 1 if installed in Canada.
7.1

External connection board connections

Make all electrical connections inside the external connection box.
▶ Remove the cover of the external connection box ( fig. 29).
Fig. 29 Removing the cover from the external connection box
DANGER: Connecting incoming power
The boiler must be electrically grounded in accordance
with local codes, or in absence of local codes, with the
National Electrical Code, ANSI/INFPA 70 and/or the CSA
C22.1, Electrical Code.
Logamax plus GB142-24/30/45/60 – 6720820104 (2017/05)
72150200-28.1TD