Western Electric 407A-4, Инструкция по эксплуатации

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are obtained by separate control of the cooler b l owers and
by manipulation of the by-pass valve
(
Zl8W
)
. The safety by­
pass valve
(
WZ lW
)
protects the cooler radiator s from exces ­
sive head pres sure and the vacuum tube s ockets from exces­
s ive back pres sure .
In addition to the above-mentioned controls , indicators,
and safety device s , other valves and piping are installed
for quick and easy isolation and drainage of the several
branche s of the water c ircuit , and for isolating and drain­
ing either coo ling unit without dis turbing the operation of
the system as a whole . Provision al so can be ma.de for di­
verting the hot water into the hous e heating system and s o
utiliz ing its heat in cold weather .
Installation Notes
When the piping has been completely connected, the sys ­
tem should first be checked and flushed thoroughly with
clean water. To do this, insert vacuum tub es or dummies in
al l sockets and clos e al l valves including s ocket valves ,
drain cocks , and gauge cocks , excepting only the tank water
gauge valves . Fill both tanks with clean water and proceed
as follows :
Ob s erve and make notation of exact level of water in
each tank. Then open the fol lowing valves :
Tank inlet valves z 20. 1w and z 20. 2w
Tank outlet valves Z 21 . 1W and Z21 . 2W
Pump inlet valves Z l . lW and Z l . 2W
I s olating valve ZlC, in unit C
Isolating valve ZllW
By-pas s valve Zl8W
Gauge cocks at M4W and M5W
Open vents on pump chambers until water fl ows from vent s ,
showing pumps are primed, and then close vents .
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