Rinnai RCB301AN User Manual page 13

Figure 7
Central Heating
Supply
Gas
Table: Connection Sizes
Gas
CH In (CH Return)
CH Out (CH Supply)
Condensate Drain
Venting (Intake & Exhaust)
Rinnai Commercial Boiler User Manual
Condensate Drain
Connection Connection Size Minimum Pipe Size
1 in. NPT
1-1/4 in. NPT
1-1/4 in. NPT
1 in. NPT
4 in. PVC/CPVC
Measurements: in. [mm]
Central Heating
Return
Dimension "A":
Model RCB301AN:
10.96 [278]
Model RCB399AN:
13.84 [352]
1 in.
1-1/4 in.
1-1/4 in.
3/4 in.
4 in.
13