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11
NOTE: Vertical piping will prevent door from opening
fully for service and cleaning of boiler.
2. Thread relief valve onto factory installed ¾" NPT
x 7¼" nipple located in left rear corner on top
of boiler as shown in Figures 1A and 1B. Valve
spindle must be in vertical position. Tighten with
wrench. Pipe discharge as shown in Figure 9.
Installation of the relief valve must be consistent
with ANSI/ASME Boiler and Pressure Vessel Code,
Section IV.
3. On boilers with rear tankless heater, factory wired
L7224C Control Relay was not installed in heater.
Locate ¾" NPT Immersion Well, apply sealant and
thread into ¾" NPT tapping on heater. Apply heat
transfer paste (not furnished) to control bulb and
insert bulb into immersion well. Tighten clamp
screws to secure control to immersion well. Secure
Figure 9: Recommended Boiler Piping for Series Loop Hot Water System
control conduit to jacket right side panel with 5/8"
cable clamp provided, refer to Figure 1B.
4.
CONNECT FIELD WIRING
a. Water boilers without tankless heater and with
front tankless heater. Connect the eld wiring
from the circulator to the aquastat control and
from the control to the burner. Make the wiring
connections as shown on Figures 16B.
b. Water boilers with rear tankless heater. Connect
the eld wiring from a standard junction box to
the circulator, aquastat control and burner. Make
the wiring connections as shown on Figure 17B.
G. INSTALL STEAM BOILER TRIM AND CONTROLS,
(see Figures 1C and 1D).
1. Thread ¾" MPT safety valve and ¾" NPT coupling
onto factory installed ¾" NPT x 7¼" nipple located