Form 155.16-N3 (899), IsoFlow Absorption Chillers with Buffalo ...

outlet port. Therefore, keeping the flow constant while
the temperature changes. This can be done in two different
ways depending on the valve manufacturer. See below
Fig. 17 for valves manufactured by Honeywell.
TO UNIT
GENERATOR
HOT WATER
SUPPLY
HOT WATER
RETURN
FIG. 17 – DIVERTING SERVICE FOR
HONEYWELL VALVE
For Honeywell valves, the hot water supply enters the
valve at the “common” connection. The hot water outlet
to the generator is sometimes marked “A” or is unmarked.
The bypass connection is sometimes marked
“B” or it may also be unmarked.
YORK INTERNATIONAL
3-WAY DIVERTING
CONTROL VALVE
BYPASS
FOR HONEYWELL VALVE
TO
GENERATOR
FROM
GENERATOR
INLET
LD00944
LD04747
DIVERGING FLOW
PLUG UP PLUG DOWN
(fastened to valve body)
TO BYPASS
FORM 155.16-N3
See Fig. 18 for installing valves manufactured by Fisher.
For Fisher valves the hot water supply enters the valve
at the marked “inlet” connection and exits the valve to
go to the generator at the marked “unit” connection.
The bypass connection is sometimes marked “bypass”.
INLET AND OUTLET HOT WATER PIPING
FIG. 18 – DIVERTING SERVICE FOR FISHER VALVES / DETAIL OF FISHER VALVE
Fig. 19 is a sample of a hot water piping arrangement
for a YORK IsoFlow TM absorption chiller depicting a
Fisher 3-way hot water control valve.
The following is a description of each component on the
hot water supply/return line to the unit.
Manual Block Valves – These valves are installed,
one on the supply line and one on the return line, to
manually shut off hot water to the unit, thus allowing
ease of serviceability if required.
3-WAY DIVERTING
CONTROL VALVE
HOT WATER
SUPPLY
BYPASS
TO GENERATOR
HOT WATER
FROM
RETURN
GENERATOR
FOR FISHER VALVES
LD00945
31