User Manual

10
2. Attach slide bracket angles to heater with #8 sheet metal screws. It will be necessary
to drill 1/8” holes into heater jacket for screw pilot holes.
3. Slide heater onto slide rails under dishtable.
PIPING INSTALLATION – See Diagrams
NOTES:
• No check valve ma
y be installed in the supply line to the booster.
• All shut-off valves m
ust be gate
or ball valves – not globe valves.
• To m
inimize heat loss and maximi
ze efficiency, hot water piping should be insulated.
• Teflon tape should be used on all NPT threaded pipe connections.
1. Install
the optional dielectric unions on the inlet and outlet piping.
2. Connect the cold/warm water inlet and hot water outlet to the appropriate connections
as shown; refer to the specifications for location and sizes.
IMPORTANT – Be certain to connect the outlet piping to the final rinse and not to the
wash tank. Insulate if over 3 feet.
IMPORTANT (applies to J6 Models only) – Do not turn the entering warm water or
exiting hot water nipples from their factory installed positions. The internal diffusers
are aligned at the factory and turning the nipple will change the diffuser position and
affect performance. Hubbell recommends that the inlet and outlet pipes are insulated
to prevent excessive heat loss.
IMPORTANT (applies to J6 Models only) – Do not apply heat directly to the entering
warm water or exiting hot water nipples. If sweat connections are to be used, sweat
tubing to the adapter before threading the adapter to the nipple on the heater. Any heat
applied to the heater nipple will damage the internal plastic diffuser and affect
performance.
3. Install the pressure reducing valve in the entering cold/warm water inlet line and adjust
to 20-psi. The standard PRV comes preset to 25psi. The optional brass PRV is preset
to 50psi and must be adjusted to 25psi. The set screw located at the top of the
diaphragm adjusts the pressure, turn clockwise to increase the pressure and counter-
clockwise to decrease the pressure. NOTE: Be sure to install the valve with flow in the
proper direction as indicated by the directional arrow on the valve. IF A STANDARD
PRESSURE REGULATOR IS USED, it acts as a check valve and it is possible that
thermal expansion will cause the relief valve to drip or occasionally blow off a small
amount of water. To overcome this condition, it is recommended that a 3/8” by-pass
arrangement with a horizontal check valve be installed around the pressure regulator.
This will prevent annoyance caused by the relief valve dripping or blowing off.
NOTE: It is strongly recommended that a pressure reducing valve with built-in bypass
is installed in models where one is not supplied.
4. Install the combination temperature and pressure safety relief valve in the tapping
provided. Note that this is required by law for safety considerations.
Install into provided tapping Manual Release Lever
Temperature Probe
Outlet to floor drain
5. Install a relief valve overflow pipe to a nearby floor drain.
NOTE: Relief valve discharge piping limitations:
a. Termination to be plain end (no threads) and 6-inches above the drain.
b. Maximum 30-feet.
c. Maximum four (4) elbows.
d. No reduction in line size.