VT8800/WT8800 WATER HEATER CONTROLS
3
69-1731
Table 1. Capacity of VT8800
a
Capacity based on 1000 Btu/feet
3
, 0.64 specific gravity natural gas at 1 in. wc pressure drop (37.3 MJ/meter
3
, 0.64
specific gravity natural gas at 0.25 kPa pressure drop).
b
Valves are guaranteed at 77 percent of the rating.
Fig. 2. Typical capacity curve for VT8800 Family Water Heater Control System.
Table 2. Gas Capacity Conversion Factor.
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.
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.
Model
Size (Inlet x Outlet),
in.
Capacity (at 1 in. wc
pressure drop
a,b
)
Minimum Regulated
Capacity
Maximum Regulated
Capacity
VT8800
1/2 NPT x 1/2 Inverted
Flare
50 ft
3
/hr (1.4 m
3
/hr)
30 ft
3
/hr (0.85 m
3
/hr)
85 ft
3
/hr (2.8 m
3
/hr)
Gas (Btu/ft
3
)
Specific Gravity
Multiply Listed Capacity By
Manufactured (500)
0.60
0.516
Mixed (800)
0.70
0.765
Propane (2500)
1.55
1.62
M23035
DIFFERENTIAL PRESSURE (IN. W.C.)
NA
TURAL
GAS
FLOW (
KBTU/H)
60
70
50
40
30
20
0.90
0.95
1.00
1.05
1.10
1.15
1.20
1.25
1.30
100
90
80
1 IN. CAPACITY
69-1731.fm Page 3 Monday, October 10, 2005 11:02 AM