7
PROCEDURE D: Completely fill & purge
heating system. Make sure that all heat-
ing system manual air vents are closed.
1. Check that flow direction arrows on
hydronic components are facing in proper
direction.
2. Attach hose to drain valve “B”, Figure
1.10, and close valve “A”. Open valves “C”,
“D”, “E” and “F” and drain valve “B”. Fill
system with water until water runs out of
the hose in a steady stream, no visible air
bubbles.
3. Close valves “C” and “D”. Open valve
“A”. When water runs out of the hose in a
steady stream, no visible air bubbles, close
drain valve “B”.
FIGURE 1.10
If a hot water boiler is installed in connection with a
water chiller, the chilled water must be piped in paral-
lel with the boiler, using appropriate valves to prevent
the chilled medium from entering the boiler, Figure
1.9. When boilers are connected to heating coils locat-
ed in air handling units where they may be exposed to
refrigerated air circulation, the boiler piping system
shall be equipped with flow-control valves or other
automatic means to prevent gravity circulation of the
boiler water during the cooling cycle.
PROCEDURE C: For combination heating and cooling installations only.
NOTE: VALVES "H" OPENED ON HEATING WITH "C" VALVES
CLOSED REVERSE PROCEDURE ON COOLING.
EXP. TANK
VENT
ROOM
UNIT
DRAIN
CHILLER
BOILER
H
C
PUMP
RELIEF
VALVE
FILL
VALVE
DRAIN
C
H
BOILER
FIGURE 1.9
➤
➤
FOR WATER TREATMENT & FREEZE PROTECTION REQUIREMENTS,
SEE “ MAINTENANCE” IN THIS MANUAL
Summary of Contents for EW2-1203
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