UTICA BOILERS MGB50 Installation, Operation & Maintenance Manual page 8

Figure 6 - Bypass Piping Automatic Mixing Valve
Figure 7 - Bypass Piping - Fixed Low Temp Only Automatic Mixing Valve
7.
Installation using circulators and zone valves are
shown in Figures 8-11. For further piping information
refer to I=B=R Installation and Piping Guide.
WARNING
!
Burn and scald hazard. Safety relief valve could
discharge steam or hot water during operation.
Install discharge piping per these instructions.
Install discharge piping from safety relief valve.
8.
• Use ¾" or larger pipe.
• Use pipe suitable for temperatures of 375°F (191°C)
or greater.
connectIng supply and return pIpIng
TO SYSTEM
WATER INLET
EXPANSION
TANK
CIRCULATOR
SHUT-OFF
VALVE
TO SYSTEM
SYSTEM
CIRCULATOR
WATER INLET
EXPANSION
CIRCULATOR
SHUT-OFF
VALVE
BOILER
PRESSURE
BALL VALVE
REDUCER VALVE
3 WAY MIXING
CHECK VALVE
VALVE
V1 V2
TANK
BOILER
PRESSURE
BALL VALVE
REDUCER VALVE
ZONE VALVE
CHECK VALVE
• Individual boiler discharge piping shall be independent
of other discharge piping.
• Size and arrange discharge piping to avoid reducing
safety relief valve relieving capacity below minimum
relief valve capacity stated on rating plate.
• Run pipe as short and straight as possible to location
protecting user from scalding and properly drain
piping.
• Install union, if used, close to safety relief valve outlet.
• Install elbow(s), if used, close to safety relief valve
outlet and downstream of union (if used).
• Terminate pipe with plain end (not threaded).
8
FROM SYSTEM
ALTERNATE
CIRCULATOR
LOCATION
AIR SEPARATOR
HOSE BIB
FROM SYSTEM
ALTERNATE
CIRCULATOR
LOCATION
AIR SEPARATOR