5
GTS DRISTEEM STANDARD SERVICE MANUAL
Shut down humidifier
Follow the procedure below before performing service or
maintenance procedures (after the tank has cooled down
and drained):
1. Use the controller keypad to change the control mode
to Standby.
2. Shut off all electrical power to the humidifier using the
field-installed fused disconnect, and lock all power
disconnect switches in the OFF position.
3. Close the field-installed manual water supply and gas
shut-off valves.
INSPECTION AND MAINTENANCE
Annually
(also recommended when maintenance is
performed)
1. All safety devices in the control circuit should be
cycled on and off to verify they are functioning. These
include:
• High limit switch
• Airfl ow proving switch
• Low water level probe. Pull out probe plug; fi ll valve
should energize.
• Redundant low water level probe
2. Inspect tank, piping, and gaskets for water and gas
leaks.
Seasonally
(or as required, depending on water quality)
1. Clean the tank:
a. Remove cleanout plate and dispose of any loose
scale that has collected in the tank. Do this before
the scale buildup reaches the bottom of the heat
exchanger.
b. Inspect the area inside the tank in front of the drain
valve fi tting and thoroughly clean all scale and
mineral buildup from that area.
2. Dismantle and clean the drain valve and associated
piping.
3. Clean the probes:
Access the probe assembly either from the electrical
panel or by removing the roof panel above the
electrical area.
a. Disconnect the probe plug and cable assembly and
unscrew the probe rod assembly from the humidifi er
probe housing.
b. Inspect the probe housing and clean, ensuring that
all the housing passageways are clear. Remove the
housing from the tank by removing the cover plate
from the tank.
• The scale should fl ake off easily from the probe
assembly rods.
• The bottom 3/8" (10 mm) of each rod is the
sensing portion; clean these areas with a wire
brush, abrasive pad, or steel wool.
c. Inspect the composite plastic probe rod assembly
for any signs of cracking, roughness, or
deterioration. If found, replace probe assembly.
d. Reassemble the probe assembly.
4. Clean the skim/overflow port:
a. Water should drain from the skimmer drain pipe
after each fi ll cycle. This should be verifi ed visually
by a weekly inspection.
b. Loosen deposits in and around the skimmer/
overfl ow port with a long tool such as a
screwdriver.
c. If fl ow through the water seal/P-trap is diminished
due to mineral accumulation:
• Remove the water seal piping from the
humidifi er and fl ush out.
• Replace the water seal with new piping if the
minerals have hardened in the water seal.
5. Clean the low water cutout probe: Remove the
shroud cover and inspect the probe rod for mineral
accumulation. The rod is located on the top of the tank
near the back. Use stainless steel wool to clean the
probe.
6. Inspect the blower motor: A lubrication port is not
provided, therefore lubrication is not required.
7. Remove dust: Using a vacuum, remove all dust from
areas around the motor, vent fan(s), and louvers that
allow air to the shrouded area.
8. When the maintenance requirements are complete:
a. Replace cleanout plate and tighten the nuts on
the plate. Torque the nuts to 25 to 35 in-lbs
(2.8 to 4.0 N-m).
b. Verify that the probe rod holder is secure and
that the probe plug and cable assembly are
plugged into the probe rod holder.
c. Verify that the drain valve assembly is in the
closed position.
d. Replace and secure all covers and doors.
e. Turn on the water supply.
f. Turn on the electrical power.
g. Turn on the gas.
Do not leave humidifi er unattended. Allow the
humidifi er to cycle through multiple fi ll cycles
and verify that the humidifi er cover, cleanout
plate, and probe holder gasket are not leaking.
Off-season maintenance
1. Perform complete inspection and cleaning of the
following:
• Probe
rods
• Skimmer port and water seal
• Humidifi er tank
• Heat
exchanger
2. After cleaning, the humidifier should remain empty
until humidification is required.
GTS, standard water, service instructions
