4
GTS DRISTEEM STANDARD SERVICE MANUAL
INSPECTION RECOMMENDATIONS:
• User inspection every 30 days.
• Appliance system inspected once a year by a qualifi ed
service person.
Note:
Do the procedure below prior to cool-down/
shut-down.
DURING INSPECTION, VERIFY THE FOLLOWING:
• Proper fi eld operation of burner. Measure CO,
CO
2
%, O
2
%, fl ue temperature, and burner effi ciency
at 100% demand with the tank at a boil. Verify that
measurements are within the guidelines described in
Table 4-1; if not, consult DriSteem.
Table 4-1:
GTS products of combustion guidelines
(at 100% demand)
CO
Less than 40 ppm; 0 or low single digits is
typical
CO
2
%
8-10%; 9% is typical for natural gas, 10% is
typical for LP gas
O
2
%
4-7%
Flue temperature
Less than 400 °F plus room temp.
(Less than 204.4 °C plus room temp.)
Burner effi ciency Greater than 80%
• Flue passageways external to the appliance, such as
vent connector and chimney, are clear and free of
obstructions.
• Vent connector is in place, sloping upward and is
physically sound without holes or excessive corrosion.
• Physical support of the appliance is sound without
sagging, cracks, or gaps between fl oor legs or tank
fl anges.
• There are no obvious signs of deterioration of the
appliance.
• Burner fl ame is blue or orange in color — up to ¼"
(6 mm) from the surface of the burner.
Cool down humidifier
Before performing service or maintenance procedures,
allow the tank to cool down. Insulated and uninsulated
tanks will have hot surfaces.
Note:
Fresh make-up water is used to speed up cooling.
Do not close the manual water supply before
cooling down the humidifi er; otherwise the tank
could stay hot for several hours.
1. Verify that there is no call for humidity and that the
aquastat set point (adjusted using the keypad/display
Setup screens) is less than room temperature (default
setting is 40 °F [4 °C]) so the burners do not energize
while cooling down the tank.
2. Verify that the tank is in Auto mode so it will fill after
draining begins.
3. Drain the tank:
Models with a manually operated drain valve:
a. Manually open the drain valve by moving the valve
lever located on the back of the drain valve to the
manual open position. The fi ll valve will open after
enough water has drained out of the tank.
b. Let the fi ll water run until the tank is cooled; then
shut off the fi eld-installed manual supply water shut-
off valve.
c. Let the tank drain; then manually close the drain
valve.
For models without a manually operated drain
valve,
use the keypad to perform the cool down
procedure:
a. From the Main menu, enter the following submenu:
• Vapor-logic3 controller: Control Modes
• Vapor-logic4, 5, 6 controller: Tank Status.
b. Change mode to Manual Drain (Vapor-logic3)
or Drain (Vapor-logic4, 5, or 6), and allow
approximately half the water to drain out of the
tank.
c. Change the mode back to Auto; the fi ll valve opens
and the humidifi er cools down.
d. When the fi ll valve closes, go back into Drain
mode, and allow the tank to drain completely. The
humidifi er should be cool enough to work on.
e. For more information about using the keypad,
see the Vapor-logic Controller Installation and
Operation Manual shipped with the humidifi er.
GTS, standard water, service instructions
