Gas Piping; Water And Steam Trim Components - Weil-McLain LGB-5 Manual

LGB-5 CSD-1
B
C
Part Number 550-110-682/0304
Series 2 Propane gas – Control Supplement

Gas piping

1. Contact gas supplier to size pipes, tanks and regulator.
a. Inlet gas pressure to manual main shut-off gas valve —
minimum 11" W.C., maximum 13" W.C.
b. If pressure to gas valve exceeds 13" W.C., install 100% lockup gas pressure regulator
upstream of hand valve.
2. Remove gas supply knockout disc from left side jacket panel. Gas supply can only enter
from the left side because of the length of the CSD-1 gas train assembly.
3. Follow good piping practices.
Pipe joint compound used must be resistant to corrosive action of liquefied
petroleum gases. Apply sparingly only to male threads of pipe joints. Use of
excessive pipe joint compound can result in damage and possible failure of
gas train components.
4. Install drip leg and manual gas valve at inlet of gas connection to boiler. Where local utility
requires, extend drip leg to floor.
5. Install ground joint union when required for servicing.
6. Support piping by hangers, not by boiler or its accessories.
7. Purge all air from supply piping.
8. Before operating boiler, check boiler and its gas connections for leaks.
Do not check for gas leaks with an open flame — BUBBLE TEST. Failure to
use bubble test or test for leaks can cause severe personal injury, death or
substantial property damage.
a. Close manual main shutoff valve (exterior to jacket) during any pressure testing at less
than 13" W.C.
b. Disconnect boiler from gas supply piping during any pressure test greater than
13" W.C.
Water and steam trim
components
1. LGB-5 CSD-1 boilers are equipped with the following components, as required by the
ASME CSD-1. Consult local codes for any special or additional requirements.
a. LGB-5 CSD-1 water boilers include the following:
• a manual reset high temperature limit control and an automatic reset limit control.
• a manual reset low water cutoff (probe type supplied). Install the probe low water
cutoff in the supply or return piping, above the top of the boiler. The low water
cutoff must be mounted between the boiler and any isolation valve(s) installed in
the piping.
b. LGB-5 CSD-1 steam boilers include the following:
• a manual reset high pressure limit control and an automatic reset limit control.
• a manual reset float low water cutoff plus an automatic reset float low water
cutoff (gravity return steam boilers) or an automatic reset float low water cutoff/
pump control (pumped return steam boilers).
The controls may be mounted on either end of the boiler. All controls (and
the junction box) must be mounted on the same end.
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