DURAWATT
®
ELECTRIC WATER HEATERS
PV500-6 05/13
7
4. Insulate hot water and return circulation lines. Also, if subject to freezing during shutdown or during operation,
insulate all water piping and take whatever steps are necessary to keep the appliance and all water containing
pipes and components from freezing.
IMPORTANT:
Do not use the plumbing connected to the appliance as a
ground for welding or any other purpose.
5. The water heater is equipped with a temperature and pressure relief valve(s) rated for the input. Pipe the relief
valve discharge to a suitable open drain. The drain pipe may not be smaller than the relief valve opening and
must be secured to prevent it from lifting out of the drain under discharge pressure. Do not install valves or
restrictions in the discharge line.
6. Pipe the drain valve to a suitable open drain.
3.6 Service
Clearances
Allow sufficient space to provide adequate clearances on all sides for service and inspection. Recommended
clearance is 24” at the top and front, 18” at left and right sides of the appliance. Optional equipment may increase
the clearance requirements. Allow sufficient space for installing and servicing connections such as water, electrical,
pump and other auxiliary equipment.
3.7 Clearances to Combustible Surfaces
The appliance must not be installed on a combustible floor, or on a non-combustible floor covering combustible
material. The minimum clearance to combustible material is 6” from the top, sides and rear, and 24” from the front.
Distance minimale aux matériaux combustibles est de 15 cm sur le dessus, les côtés et à l'arrière et 61 cm à l’avant
et ne doit pas être installé sur un plancher combustible.
3.8 Electronic Low Water Cutoff
The device consists of a probe in the tank that acts as a switch, open when submerged in water and closed when
the water level is below the probe, preventing heating elements from energizing. The probe should be kept free of
scale buildup to insure operation.
4 OPTIONAL
EQUIPMENT
4.1 Shunt Trip Circuit Interrupter
(optional on all models): The shunt trip, wired in the non-automatic circuit
interrupter, is a safety device designed to open the circuit interrupter and prevent the elements from energizing if
the control panel door is opened.
4.2 Time
Sequencer
(optional on all models): Time sequencing is optional and used in lieu of the proportional
sequencer. It is a series of time delay relays wired to the contactors which allows approximately a 40 second delay
in energizing each succeeding heating element when the controls call for heat. This prevents all heating elements
from energizing at the same time.
4.3 Proportional
Sequencer
(optional on all models): Progressive sequencing (orbital) equalizes the on time for each
contactor and heating element. The heating elements are staged-on based on the demand on the water heater. The
control gives visual, indication of stages that are on. In the event of power interruption, all contactors are turned off.
When power is resumed, the control will re-stage the elements beginning with number one.
