21
TO RETURN
CITY WATER SUPPLY
NO. 764
NO. 63
SUPPLY LINE
MINIMUM
DIMENSION
29-3/4
TO RETURN
CITY WATER SUPPLY
CITY WATER SUPPLY
WATER
LINE
A
TO RETURN
WATER
LINE
A
1.1/2
67 SERIES
CUTOFF
WATER
LINE
NO. 150
OR
NO. 93
STEAM BOILERS - SERIES S
BOILER TAPPINGS ARE AVAILABLE FOR ALL CONNECTIONS SHOWN
NOTE: Mount electrical supply on opposite side.
NOTE: Mount electrical supply on opposite side.
McDONNELL FEEDER CUTOFF
COMBINATION
McDONNELL PUMP CONTROL AND LOW-WATER
CUTOFF USED WITH CONDENSATE RECEIVER
AND ELECTRIC BOILER FEED PUMP
SEPARATE McDONNEL FEEDER AND
SEPARATE McDONNEL LOW-WATER
CUTOFF
BOILER SIZE
USE
300 THRU 1500
No. 47-2* Control Mounts in
Gauge Glass Tappings
1600 THRU 3000
No. 51.2* Control Mounts in
1-inch Tappings
NOTE: For multiple boiler installation with gravity return, use feeder Cutoff
Combination or separate feeder and separate cutoff on each boiler.
FOR CLOSED HEATING SYSTEMS
DIMENSION A = 2 • 2 ½
*
These items available through your Distributor.
WATER BOILERS - SERIES W
BOILER TAPPINGS ARE AVAILABLE FOR ALL CONNECTIONS SHOWN
WITH EXCEPTION OF NO. 764 WHICH MOUNTS IN PIPING
McDONNELL LOW-WATER CUT-OFF
McDONNELL FEEDER CUT-OFF COMBINATION
** Water supply pressure must exceed relief valve
setting by at least 20 psi.
For boilers with
75-to 100-psi relief valve setting
BOILER SIZE
USE
ALL SIZES
No. 150
For all boilers up to
50-psi relief valve setting
BOILER SIZE
USE
ALL SIZES
No. 63*
ALL SIZES
NO. 764*
*These items available through your Distributor.
For boilers with
30-psi relief valve setting
BOILER SIZE
USE
300 THRU 1500
No. 247-2
1600 THRU 3000
No. 51-2*
For boilers with up to
75-psi relief valve setting**
BOILER SIZE
USE
ALL SIZES
No. 53-2
BOILER SIZE
USE
300 THRU 1500
No. 247 mechanical feeder or No.
101-24V electric feeder with transformer
- for use on closed heating systems only.
1600 THRU 3000
No. 51.2*
NOTE: For multiple installation with condensate tank and single boiler feed
pump, use No. 93 on each boiler to operate motorized valve in each boiler
feed line.
FOR CLOSED HEATING SYSTEMS
DIMENSION A - 2 = 2 ½ inches
FOR PROCESS OR PARTIAL PROCESS SYSTEMS
DIMENSION A - 1 = 1 ½ inches
BOILER PIPING
Figure 33
Figure 34
