lp-673 Rev. 000 Rel. 001 Date 8.30.18
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Electronic LCD Display –
The high resolution display allows the user
to monitor water heater functions. The display also provides the means
to program the system parameters to maximize the efficiency of the
system design.
Combustion System (Blower – Gas Valve – Mixer – Burner – Spark
Ignition) –
The highly efficient spark ignition combustion system uses
a variable speed blower to adjust combustion as the system requires
more or less energy. The negative regulated gas valve provides only
the amount of fuel required to ensure clean combustion. The mixer
accurately regulates the combination of gas and air throughout the
modulating range to ensure high reliability. The burner is constructed
of durable ceramic metal fiber for long service life.
Water Heater Sensors (Inlet – Outlet – Flue - System) -
Sensors
provide highly accurate temperature monitoring to ensure accurate
system control. These sensor inputs can be monitored through the
water heater control system and display.
Pressure Gauge –
Allows the user to monitor system pressure.
System Safeties –
The water heater is provided with many safety
features to ensure reliable and safe operation. Each safety is connected
to the water heater control. The water heater will alert the user if an
unsafe condition occurs and needs to be addressed. The following
are provided safeties: Flue Pressure Switch (monitors flue pressure),
Burner High Limit (monitors burner plate temperature), High Limit
Water Switch (monitors water heater water temperature), Low
Water Sensor (monitors water level in the heat exchanger), optic
flame sensor (monitors flame quality), Flue Sensor (monitors flue
temperature), Condensate Pressure Switch (monitors pressure to
ensure condensation does not back up into water heater).
Manual Air Vent –
Each water heater is equipped with an air vent to
discharge air from the system during start–up.
1 ¼” Inlet and 1 ¼” Outlet Connection –
Water heaters are equipped
with bottom piping connections.
Gas Connection –
The water heater is equipped with a ¾” gas
connection to connect the incoming gas supply.
Field Wiring and Power Switch –
Each water heater is supplied with a
power switch to cut off power. The water heater is also equipped with
two front mounted terminal strips. These terminal strips are separated
into low and line voltage to ease system wiring.
Condensate Trap and Hose Assembly –
Each water heater has a built-
in condensate trap to control the discharge of condensate produced by
the water heater during normal operation. A corrugated condensate
hose is also provided to ensure proper drainage of condensate into
the pump or drain.
Low Water Cut Off Probe –
LWCO is provided with each water
heater to ensure the heater has an adequate water level to eliminate
overheating and damge to the heat exchanger.
Pump Service Mode –
Allows manual operation of pumps to
commission system and check pump operation.
Cascade Operation -
This water heater can be configured to run with
multiple units in a Cascade System. In a Cascade System, multiple
water heaters are installed, piped, and wired to cooperate in a single
system. This provides many advantages over a single large capacity
water heater, including increased turndown, system redundancy, and
increased efficiency. A maximum of sixteen (16) water heaters can be
controlled by a single water heater designated as the “Master”. Other
connected water heaters are designated as “Followers”. A DHW sensor /
aquastat / or system sensor must be wired to the Master unit.
The Master controls the operational run time of the connected
Followers and modulates the connected units up or down to ensure
the units are putting only the needed energy into the connected
storage tank, and also to ensure all connected units get even run time
to balance out service requirements.
When the Master water heater receives a call for heat from the DHW
sensor / aquastat / or system sensor, the Master will energize the lead
water heater in the cascade system. In a new system start-up this will
be the Master. The water heater will fire at its ignition speed and then
modulate its firing rate to maintain the set point. If the first water
heater reaches 80% of its firing rate, the Master will modulate down
and split the load in half with the next unit in the system service
rotation. At this point, the Master will fire the second water heater in
the system. If there are more than two water heaters in the system,
the same principle will be applied. Once the lead water heater
reaches 80% of its firing rate, it will modulate down and split the
total amount of load by the total number of units in the cascaded
system.
If the set point still cannot be met, the Master will continue firing
more Followers until either the heat demand is met or all water
heaters in the cascade system are firing at the maximum rate.
As the heat demand decreases, all operating water heaters will
modulate down according to the heating load. The first water
heater to modulate down to 30% will shut off. The same principle
will be applied to the remaining water heaters in operation until
the setpoint of the storage tank is satisfied. When the demand is
satisfied, the water heaters will turn off.
If 0-10V is used, connect the 0-10V to the low voltage terminals
provided on the Cascade Master. The set point will be determined
based on the programmed parameters. If 0-10V is not used, a fixed
temperature set point can be programmed into the control.will turn
off.
H. Wall-Mounting
The water heater must be installed on a wall that can bear its
weight (more than 100 lbs. when fully plumbed and full of water).
Installing the water heater on a wall which cannot support its
weight could result in property damage, personal injury, or death.
When installing a cascaded system, it is important that the water
heaters are the same model. Failure to ensure the water heaters
are the same model will result in improper system operation,
wasted time, money, and possible property damage and personal
injury. Such damages ARE NOT covered by product warranty.
The water heater may be installed on any suitable internal wall
(suitable sound-proofing may be required when installing onto a
stud partition wall).
This water heater is too heavy for one person to lift. It is highly
recommended to install the water heater with two people. Use
caution as to not drop the water heater, which could damage the
water heater and cause property damage and/or severe personal
injury. Verify that the water heater is properly and securely
mounted before leaving unsupervised. Failure to comply with
the above and properly mount the water heater could result in
substantial property damage, severe personal injury, or death.
This wall mounting system is not seismic rated and should not be
applied as such. Failure to comply with the above and properly
mount the water heater could result in substantial property
damage, severe personal injury, or death.
Positioning the Water Heater on the Wall
1. Attach the wall bracket on the location where you want to
install the water heater. Ensure it is level and on stud (16”
centers) before proceeding.
2. Mark the four drill holes with a pencil or marker. Remove the
wall bracket.
3. Drill four (4) holes using a 5/32 drill bit at the marked hole
locations.
4. Mount the wall bracket to the wall with the four (4) included
anchor bolts. Ensure the mounted bracket is level. See Figure