PS Magazine - TB 43-PS-479
PS, The Preventative Maintenance Monthly
ISSUE 479
OCTOBER 1992
40,±² BTU
Heaters
•.±
B" v
=
sa
P±
S
ome pressure check valVes on the 400,000
bt
heaters are safety hazaRds.
The bUm VaLVes ±eAk F²e± in the comB³s´Ion chambers of ´he hea´eRsµ When ´he
engiNe is s´a¶´ed· the f³el can p¶e-¸gni´e and ca³se ´he hea¹er to expºode»
Never inspec³ youR hea´er Iµ A ¶u·ld-
ing or ¸en¹ .
.. only ou¹Sideº
2
Look through PoR
»
on the
heater.
H
t±e burne²'s Not lit, the
presSure check valve³s
OK¼
´owever
••²
If you
½E
a fµame
•³²
the vaµve¶s bad· ¸hut down
the eng¹ne and get at µeast
5¾
f¿
away from the heate² untº»
thef¼½e¾n the heat exchaNge²
goes
À!
_±²
:/
Then, get you½ mechan¿c to
ÀnStaµl a new Á½e checK
vaµveà ĸÄ
Á1Â27ÃÄ
¼o make s½re the New ValVe's not leak¾¿gÀ do steps 1 aNd 2 agaÁ¿µ
Âf Yoà see No flameÄ the heateRÅs good ´o goµ Æollow ´he ¾nstRÃc´¾oNs Án Para 2Ç7B(2)
of TM 5ÈÉ520Ê251Ë1É to start a¿d operate the heater.
Ì8
ÅCÆ9Ç
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