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WV8840A WATER HEATER CONTROLS
PLANNING THE INSTALLATION
WARNING
Fire or Explosion Hazard.
Can cause severe injury, death or property
damage.
Follow these warnings exactly:
1. Plan the installation as outlined below
2. Plan for frequent maintenance as described in
the Maintenance section.
3. Review the following conditions that can apply
to your specific installation and take the
precautionary steps provided.
Frequent Cycling
This control is designed for use on appliances that
typically cycle three to five times a day. In year-round
applications with greater cycling rates of 10,000 cycles
annually, the control can wear out more quickly. Perform a
monthly checkout.
Water or Steam Cleaning
If a control gets submerged in water, replace it. If the
appliance is likely to be cleaned with water or steam,
protect (cover) the control and wiring from water or steam
flow. Mount the control high enough above the bottom of
the cabinet so it does not get wet during normal cleaning
procedures.
High Humidity or Dripping Water
Dripping water can cause the control to fail. Never install
an appliance where water can drip on the control. In
addition, high ambient humidity can cause the control to
corrode and fail. If the appliance is in a humid
atmosphere, make sure air circulation around the control
is adequate to prevent condensation. Also, regularly
check out the system.
Corrosive Chemicals
Corrosive chemicals can attack the control, eventually
causing a failure. If chemicals are used for routine
cleaning, avoid contact with the control. Where chemicals
are suspended in air, as in some industrial or agricultural
applications, protect the control with a cover.
Dust or Grease Accumulation
Heavy accumulations of dust or grease can cause the
control to malfunction. Where dust or grease can be a
problem, provide covers for the control to limit
contamination.
Heat
Excessively high temperature can damage the control.
Make sure the maximum ambient temperature at the
control does not exceed the rating of the control. If the
appliance operates at very high temperatures, use
insulation, shielding, and air circulation, as necessary, to
protect the control. Proper insulation or shielding should
be provided by the appliance manufacturer. Verify proper
air circulation is maintained when the appliance is
installed.
69-2247—05
Flow Capacity & Pressure Drop
Fig. 1 shows the typical flow (kBTU/hr) vs pressure drop
(in. w.c.) curve for natural gas and LP gas. Actual
pressure drop depends on the internal configuration of the
valve. Table 1 shows the pressure drop at various flows
for the control.
100
100
90
90
80
80
70
70
60
60
50
50
FLOW
(KBTU/HR)
40
40
30
30
20
20
10
10
0
0
0.8
0.8
0.9
0.9
Fig. 1. Typical capacity curve for WV8840A family
water heater control system.
Table 1. Gas capacity conversion for WV8840A.
Gas Type
Flow (kBTU/hr)
NG
LP
INSTALLATION
When Installing This Product...
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a
hazardous condition.
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for
your application.
3. Installer must be a trained, experienced service
technician.
4. After installation is complete, check out product
operation as provided in these instructions.
2
WV8840 CAPACITY DATA
1.0
1.0
1.1
1.1
PRESSURE DROP (IN W C)
Pressure Drop
(in. w.c.)
30
50
75
30
50
75
1.2
1.2
1.3
M29520
1.43
1.47
1.54
0.91
0.94
0.97
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