INSTALLATION INSTRUCTIONS
34-00013EF-01
WT8840
Trade Water Heater Controls
APPLICATION
The WT8840 Water Heater Control is designed for use
in Standing Pilot applications using an immersion
well for water temperature sensing. All models of
WT8840 include an integrated NTC temperature
sensor.
The WT8840 is powered from a thermopile heated by
the standing pilot flame. CS8840 pilot assemblies are
designed for use with this control.
The immersion well for sensing water temperature
has matched NTC thermistor sensors. These sensors
provide the fail-safe mechanism through which the
WT8840 can provide both accurate water
temperature control as well as water temperature
limit (Temperature Cut-Out [TCO]) function.
SPECIFICATIONS
IMPORTANT
WT8840 controls provide direct replacement
only.
Pressure Regulator:
The outlet pressure regulator
setting is shown on the product label.
Inlet Pressure Range:
See appliance rating plate for inlet pressure range
recommendation.
0.5 PSI (14.0 in. w.c.) maximum inlet pressure
allowed for proper operation.
Body Pattern:
90 degrees with 1/2 in. inlet and
1/2 in. inverted flare outlet.
Mounting:
Mounting in upright position only.
Control Input:
Voltage Minimum: 350 mV dc, open circuit.
Voltage Maximum: 850 mV dc, open circuit.
Capacity:
See Table 1.
Regulation Range:
Natural Gas:
Minimum: 30,000 Btuh.
Maximum: 85,000 Btuh.
Ambient Temperature Range:
32 to 150 °F
(0 to 66 °C)
Operating Range:
0 to 150 °F (-18 to 66 °C)*
*Valve will operate at 0°F (-18°C) but valve
characteristics can not be guaranteed until
ambient temperature reaches 32°F (0°C).
Storage Range:
-40 to 150 °F (-40 to 66 °C)
Humidity:
95% non-condensing at 104 °F (40 °C)
Approvals:
This device is certified by Canadian Standards
Association (CSA) to the following standards:
ANSI Z21.20
ANSI Z21.23
ANSI Z21.78
ANSI Z21.87
CAN/CSA-C22.2 No. 199-M89
CAN1-6.6-M78
CSA 4.6
CSA 6.20
Accessory Parts:
Pilot Assembly CS8840
Trade Service Part
Replaces
WT8840A1000
WV8840A1000
WV8840A1001
WT8840A1500
WV8840A1050
WV8840A1051
WT8840B1000
WV8840B1042
WV8840B1109
WV8840B1110
WT8840B1500
WV8840B1059
WV8840B1117
WV8840B1118
