lp-181 Rev. 003 Rel. 008 Date 8.21.18
7
G. Application
Figure 3 - Typical GL-50 Installation
PIPING NOTES:
1. Check valves are optional. Circulators may have Internal Flow Checks (IFCs).
2. If a backflow preventer or no return valve is installed a thermal expansion tank suitable for potable water must be sized and installed on the
cold water inlet between the storage tank and the backflow preventer.
Part 4 - Control and Wiring
A. Control
A pre-wired surface mount thermostatic control is provided on your
storage tank. Temperature may be set by removing lower cover
screw and lower cover. has been provided for accurate temperature
adjustment.
B. Wiring
Wiring is to be done in accordance with all applicable local and state
codes. Turn off all power related to the water heating system before
starting any wiring procedures. It is recommended that a disconnect
switch be installed between the boiler control and storage tank.
When wiring the boiler and controls be sure to label all wires to
ease future maintenance. Wiring errors can cause improper and
dangerous operation.
C. Wiring Diagram
Figure 4 - Wiring the Control
1. Fill the storage tank by opening the cold water shut-off valve.
Make certain any drain valves are completely closed. Purge air from
the system by opening a hot water outlet at a fixture in a kitchen
or bathroom. When water flows freely from the outlet, the system
is purged.
Part 5 - Start-Up and Operation
When filling the storage tank, open a hot water tap to release air in
the tank and piping to ensure proper storage tank operation. Failure
to ensure the storage tank is full before turning on the system could
result in damage to the water heating system and property damage.
Such damages ARE NOT covered by warranty.
2. Check the system for leaks.
Fix any leaks before continuing the installation. Failure to do so could
result in property damage or personal injury.
3. After ensuring there are no leaks within the system, flush the system
to clear any soldering residue.
Draw at least three times the volume of the storage tank to properly
flush the system.
4. Initiate a call for hot water. Ensure each zone valve or circulator
operates only when its thermostat calls for heat. Purge each zone of air
to ensure proper operation.
5. Set the storage tank to the desired temperature. Boiler high limit
should be set at least 20
o
F higher than the storage tank temperature
setting. Set the low limit of the boiler control at the minimum setting -
this will call the burner on only to satisfy the tank control.
A storage tank temperature setting of 120
o
F is recommended.
However, a lower temperature setting may be required to comply with
local and state codes for normal operation. Installation conditions
may require a higher or lower temperature setting. A mixing valve in
conjunction with a high temperature setting may be used for high
demand applications (spas, hot tubs, whirlpools).
6. When the system is completely flushed, purged of air, and the
temperature is set, turn on the water heating system. Observe
operation. Ensure the boiler shuts down after the storage tank set
point is satisfied.
Figure 5 - Typical Storage Tank Installation - All Other Models
