lp-181 Rev. 003 Rel. 008 Date 8.21.18
5
Figure 2 - Specications and Dimensions - NOTE: A drain valve port IS NOT included on GL-50 models.
B. Tankless Coil Connections
Refer to dimensional information chart (Figure 2) for correct tankless
coil connection size. On the tank, tankless inlet is to be connected to
a bronze or stainless steel circulator with the arrow pointing away
from the tank and toward the tankless coil. This pipe will also have
a tee for the cold supply to the tankless coil. (An optional check
valve may be installed between the cold supply line and circulator
to prevent short circulating the tankless coil. This may cause poor
supply pressure or noisy operation, depending on the type of
installation.)
On the tank, tankless outlet, use both thread tape and pipe dope and
connect a 3/4” NPT brass tee. On the run, install a brass drain valve. In
the branch, install a 3/4” (minimum) tube adapter and connect this to
the hot tankless coil outlet on the boiler.
See “Typical Installation”, Figure 3.
C. Hot Water Outlet
50 Gallon Storage Tanks: Use both thread tape and pipe dope to
connect a 3/4” NPT brass tee. In the run of the brass tee, install a 3/4”
NPT brass T&P long element for hot water heaters, as required by local
codes, but not less than a valve certied for meeting the requirements
for relief valves for water heaters (ANSI Z21.22 and CAN1-4.4) by
a nationally recognized lab that maintains periodic inspection of
production of listed equipment. The T&P valve must be plumbed
down, so discharge will exit at least 6” above the structural oor and
not contact any live electrical parts. In the bottom of the tee (branch)
vertically down, install a 3/4” NPT x 3/4” (minimum) tube adapter. Then
install two 3/4” (minimum) sweat street 90 degree elbows.
It may be recommended to use a back ow preventer - check local
codes. If a back ow preventer or no return valve is used, a thermal
expansion tank must be installed on the cold water supply between
the tank and valve. If the tank is replacing a tankless coil, disconnect
coil plumbing and use the cold water inlet and hot water outlet pipes
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