John Wood Takagi - 110-310-510 - Manual (Page 18)

18
Pump Control Mode
(Only available on the 510 models)
The 510 water heaters can be used to control a recirculation
pump. Proper pump control helps to preserve the life of the
system and saves energy as well.
The water heater pump control port is a “normally-open dry
contact”, and therefore needs additional components to
properly control a recirculation pump. To control a recircula-
tion pump, connect the pump to the “Pump” connector in the
water heater as shown in the diagram below. (In an Easy-
Link system, connect the pump ONLY to the “PARENT”
unit.) The pump is to be connected using suitable relays
shown in the diagram below.
Please make sure the relays are properly rated for the recir-
culation pump.
Using the water heater’s internal thermistors as a tempera-
ture control, the recirculation pump will only turn on when
recirculation is needed.
CAUTION
In an Easy-Link system, the pump must
be connected to the “Pump” connector
in the “PARENT” unit only. If the pump is
connected to any of the “CHILD” units, the
pump will not work.
Recirculation
pump
Connect to this
“Pump connector”
Power supply
for relay
Power supply
for pump
120 VAC
220 VAC etc
120 VAC
220 VAC etc
for relay
Thermal
relay
These components
are NOT included
with the water
heater and are
external to the
unit. They must be
acquired separately.
Easy-link System
(Only available on the 510 models)
General
The 510 water heaters can be connected with other heaters
of the same model with communication cables to work as a
multiple-unit manifold system.
The Easy-Link system allows up to 4 units to manifold
together. •
A communication cable (gray color) comes with each 510
model.
You can manifold from 2 to 4 units without the need for a
multi-system controller. A 4-unit system has full automatic
modulation between 11,000 BTU/h and 796,000 BTU/h.
Gas In
Cold In
Hot Out
CAUTION
The Easy-Link system is limited up to 4
units. If you connect more than 4 units,
only the first 4 units will work as a part
of the Easy-Link system. The other addi-
tional units will not work.
All units within an Easy-Link System
must be of the same exact model.
Different models cannot com-
bine together to form an Easy-Link
System. •
•
Easy-Link Connection Procedures
1. Verify the set temperatures of all units within the system.
Every single water heater must be set to the same set
temperature.
2. Select one unit to be the “PARENT” unit.
3. “PARENT” unit:
Locate the two banks of DIPswitches to the right of the
7-seg. LED on the computer board of the unit that you
select to be the “PARENT” unit. Change DIPswitch No. 1
on the right bank of DIPswitches to the ON position. See
the computer board diagram as shown in the next page.
Do not change any DIPswitches on any of the “CHILD”
units.
4. Between the “PARENT” and the “CHILD-1” units:
Connect the “PARENT” connector of the “PARENT” unit
to the “1” connector of the “CHILD-1” unit.
5. Between the “CHILD-1” and the “CHILD-2” units:
Connect the “2” connector of the “CHILD-1” unit to the “1”
connector of the “CHILD-2” unit.
6. Between the “CHILD-2” and the “CHILD-3” units:
Connect the “2” connector of the “CHILD-2” unit to the “1”
connector of the “CHILD-3” unit.
7. Make sure the 7-seg. LED of all the units’ computer
boards display the unit #. The numbering system auto-
matically allocates the unit # to each water heater in the
Easy-Link system, in accordance with the table below.
Parent unit Unit #: 1
Child units Unit #: 2, 3 and 4
•