LAARS U.H.E. - Installation Manual - Manual (Page 7)

TEMPERATURE AND PRESSURE RELIEF VALVE –
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CONDENSATE DRAIN - The water heater should either be raised several inches above the floor on a concrete slab or
use a low profile condensate pump to allow free drainage of condensate from the elbow drain fitting. This water heater
is a condensing type unit and requires a drain to be located in close proximity to allow the condensate to drain safely.
The condensate drains from the unit at the exhaust elbow located near the bottom of the unit. The preferred connection
to the drain fitting is to use a ¾" PVC elbow sealed with silicone over the outside of the drain outlet and use ¾" PVC for
the drain trap and condensate line to a drain. Use a thick bead of silicone caulk over the outside of the drain outlet
connection before assembling the elbow. This is preferred over using the threaded tap because the larger drain line will
drain more freely and if too much force is applied to the plastic threads, the fitting may crack and cause a leak. Make
sure the condensate drain line slopes down, away from the water heater at least 1/8" per foot toward the drain. The
condensate drain pipe must not be routed through an area subject to below freezing temperatures. The condensate
build-up will block the exhaust outlet, which will cause improper operation. Refer to Figure 2 for the proper connection
of a PVC elbow to the drain outlet and a condensate trap.
WARNING
Keep clear of the combination temperature and pressure relief valve discharge line outlet. The
discharge may be hot enough to cause scald injury. The water is under pressure and may splash.
For protection against excessive temperatures and pressure, install temperature and pressure protective
equipment required by local codes, but not less than a combination temperature and pressure relief
valve certified by a nationally recognized testing laboratory that maintains periodic inspection of
production of listed equipment or materials as meeting the requirements of the Standard for Relief
Valves and Automatic Gas Shutoff Devices for Hot Water Supply Systems, ANSI Z21.22 and the
Standard CAN1-4.4 Temperature, Pressure, Temperature and Pressure Relief Valves and Vacuum
Relief Valves. The combination temperature and pressure relief valve must be marked with a
maximum set pressure not to exceed the maximum working pressure of the water heater. The
combination temperature and pressure relief valve rating must not be less than the hourly rating of th
water heater
Install the combination temperatu
this
Note: Some models may already be equipped or supplied with an installed combination temperature
and pressure relief valve. Verify that the combination temperature and pressure relief valve complies
with local codes. If the combination temperature and pressure relief valve does not compl
co
Install a discharge line so that water discharged from the combination temperature and pressure relief
valve will exit within six (6) inches (15.2 cm) above, or any distance below the structural floor and
cannot contact any live electrical part. The discharge line is to be installed to allow for complete
drainage of both the combination temperature and pressure relief valve and the discharge line. The
discharge opening must not be subjected to blockage or freezing. DO NOT thread, plug or cap the
discharge line. It is recommended that a minimum clearance of four (4) inches (10.0 cm) be provided
on the side of the w
pressure relief valve.
D
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re and pressure relief valve into the opening provided and marked for
rpose on the water heater.
y with local
de replace it with one that does. Follow the installation instructions above on this page
ater heater for servicing and maintenance of the combination temperature and
o n t place a valve between the combination temperature and pressure relief valve and the
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