7
E. TANKLESS HEATER OR COVERPLATE
1. If a tankless coil is used, install as pictured. On water
boilers (item 16A), install in opening in front section.
On steam boilers (item 16B), install in opening in
rear section. For suggested piping of tankless water
heaters refer to Figures 3.3 and 3.4.
2. If not using a tankless coil, cover the heater opening
with cover plate (item 13A or 13B).
F. CONTROLS
1. Water Boiler Controls:
a. Install the limit / operating control, pressure-
temperature gauge and safety relief valve.
See Figure 7.1 (Section 7) for proper location.
For installations subject to UL726, a second
operating control that senses water temperature
is also required (not provided). Use an L4080B
or equivalent. Install in the supply piping near
the boiler.
2. Steam Boiler Controls:
a. Install the limit / operating control, pressure
gauge, gauge glass trim and safety relief valve.
See Figure 7.2 (Section 7), Figure 3.7 (float
boilers) and cover photo (probe boilers).
b. For installations subject to UL726, a second
operating control that senses steam pressure
is required (not provided). Use a PA404A
or equivalent. On probe boilers, install the
additional pressure control opposite the
standard PA404A using a cross instead of a
tee along with a second brass siphon (not
provided). On float boilers, install the additional
pressure control in the 1/4” tapping on the top of
the float low water cut-off using a vertical (360º)
brass siphon (not provided).
c. For application of a probe low-water cut-off,
use only Hydrolevel CG450. See Figure 7.2
(Section 7) for location. See also control
manufacturers instruction sheet.
d. See Figure 3.7 for application of float low water
cut-offs.
PIPING & CONTROLS
12" MIN.
TAPPING
MIXED
3/4" CONTROL
HEATER
MIXER
COLD WATER INLET
HIGH TEMPERATURE
WATER
HOT WATER
TANKLESS
WATER
FLOW CONTROL
12" MIN.
TANKLESS
HOT WATER
MIXER
HIGH TEMPERATURE
WATER
COLD WATER INLET
FLOW CONTROL
TAPPING
CONTROL
HEATER
3/4"
MIXED
WATER
Figure 3.3: Tankless Coil Piping, Steam Boiler
Figure 3.4: Tankless Coil Piping, Water Boiler
Install anti-scald device in hot water supply piping.
Water temperature above 125°F can cause severe
burns instantly or death from scalds.
DANGER
Be sure rubber gasket is in place between cover
plate or water heater plate and boiler section.
NOTICE
Pipe the discharge of the safety
valve or relief valve to prevent injury in the event of
pressure relief. Pipe the discharge to a drain. Provide
piping that is the same size as the relief valve.
CAUTION
Series WBV
b
boilers are not for use in commercial
installations where a secondary low water cut-off is
required.
NOTICE
