TRANE EHUMD800ASM00BA Steam Humidifier Owner’s Manual
- June 6, 2024
- Trane
Table of Contents
TRANE EHUMD800ASM00BA Steam Humidifier
SAFETY
ATTENTION Read this manual before installing. This product must be installed by qualified HVAC and electrical contractors and in compliance with local, state, federal, and governing codes. Improper installation can cause property damage, severe personal injury, or death as a result of electric shock, burns, or fire. Read all cautions and instructions. Read this manual before performing service or maintenance procedures on any part of the system. Failure to follow all cautions and instructions could produce the hazardous situations described, resulting in property damage, personal injury, or death. Failure to follow the instructions in this manual can cause moisture to accumulate, which can cause damage to structure and furnishings.
EXCESS HUMIDITY
Do not set humidity higher than recommended. Condensation may cause damage.
HOT SURFACES AND HOT WATER
This steam humidification system has extremely hot surfaces. Water in steam
canister, steam pipes, and dispersion tube can be as hot as 212°F (100°C).
Discharged steam is not visible. Contact with hot surfaces, discharged hot
water, or air into which steam has been discharged can cause severe personal
injury. To avoid severe burns, follow procedures in this manual when
performing service or maintenance procedures on any part of the system.
DISCONNECT ELECTRICAL POWER
Disconnect electrical power before installing supply wiring or performing
service or maintenance procedures on any part of the humidification system.
Failure to disconnect electrical power could result in fire, electrical shock,
and other hazardous conditions. These hazardous conditions could cause
property damage, personal injury, or death. Contact with energized circuits
can cause property damage, severe personal injury, or death as a result of
electrical shock or fire. Do not remove access panels until electrical power
is disconnected.
Follow the shutdown procedure in this manual before performing service or
maintenance procedures on any part of the system.
ELECTRICAL SHOCK HAZARD
If the humidifier starts up responding to a call for humidity during
maintenance, severe bodily injury or death from electrical shock could occur.
Follow the procedures in this manual before performing service or maintenance
procedures on this humidifier.
EXCESSIVE SUPPLY WATER PRESSURE
Supply water pressure greater than 120 psi may cause the humidifier to overflow.
SHARP EDGES
Sharp edges may cause serious injury from cuts. Use care when cutting plenum
openings and handling ductwork.
INTRODUCTION
Thank you for your recent steam humidifier purchase. We appreciate your business and are pleased to add your name to our growing list of customers. You have invested in the highest quality equipment available. Your humidifier will require periodic maintenance to assure continued consistent performance. See page 10. Please take a few minutes and read this booklet. This will familiarize you with the benefits you will receive from the humidifier and help you understand the routine maintenance that will be required. Replacement Steam Canisters are available from your installing contractor. Use only genuine replacement part number 8043RP or 8043LCRP.
PRINCIPLES OF OPERATION
The Steam Humidifier delivers humidity in the form of steam to the conditioned space via the HVAC system duct. The humidifier generates steam by energizing two electrodes that extend into a canister of water. Current flowing between the electrodes causes the water to boil, creating steam. Water is introduced to the humidifier through a fill valve to a fill cup located in the top of the cabinet. The fill cup serves as an overflow reservoir and provides an air gap between the humidifier and water source. The steam canister is filled from the bottom. The canister is seated in a drain cup assembly which includes a drain valve. The drain and fill valves work together to maintain the water level in the canister to deliver the rated steam capacity based on the electrical conductivity of the water and to temper drain water. See Figure 1 for a representation of the fill and drain system and canister. Steam is delivered into the airstream through a dispersion tube mounted in the HVAC system ductwork. Openings in the dispersion tube are fitted with “tubelets™” which extend into the center of the tube. The design of the dispersion tube and tubeless distribute steam over a wide area in the duct and direct any condensed moisture back into the steam hose.
FIGURE 1 – Fill and Drain System and Canister
SEQUENCE OF OPERATION
When the Humidifier Control detects humidity below the setpoint,
and provided the humidifier is turned on and the indoor unit blower is
operating, the internal controller in the humidifier energizes the electrodes
and measures the current flowing through the water between them. The
controller adjusts the water level in the canister via a fill valve and a
drain valve to maintain a constant current. The operating water level in the
canister depends on the mineral content of the water which determines
conductivity. A relay is provided with the humidifier that will allow the
control to turn on the indoor unit blower when a call is made for humidity.
INSTALLATION OPTIONS & EFFECT OF WATER CHARACTERISTICS
Your Steam Humidifier can be installed to operate on 120 volts, 208 volts, or 240 volts using 11.5 or 16.0 amps. The higher the voltage and amperage the higher the potential output. It may take several days for the humidifier to reach rated capacity depending on the input voltage and the electrical conductivity of the water. 120 volt systems take longer to reach rated capacity than 240 volt systems. The humidifier should always be plumbed to cold water but the water can be softened or unsoftened. The water supply should have a conductivity between 125 and 1,250 uS/cm which correlates loosely to a hardness between 3 and 36 grains/gallon. The humidifier will make steam when plumbed to low-conductivity water but will take longer to reach nominal capacity. There are benefits and trade-offs to consider when both hard and softened water is available. Hard water: The benefit of hard water is less frequent draining and filling than with soft water, which results in better energy and water efficiency and more consistent steam output. However, canister replacement could be more frequent with hard water because mineral deposits coat the electrodes. The harder the water, the more frequent the need for a new canister. Softened water: The benefit of softened water is typically longer canister life than hard water because softened water does not coat the electrodes nearly as much as hard water. However, softened water ions stay in solution to much higher concentrations than hard water ions. This requires more frequent draining and filling which results in lower efficiency, higher water consumption, and less consistent steam output. Two canisters are available, the Model 8043RP and Model 8043LCRP, optimized for different water types. Contact your HVAC dealer for canister selection.
| Amperage | Voltage | Maximum steam capacity (gal/day) |
|---|
11.5
| 120V| 11.5
208V| 20.5
240V| 23.3
16.0
| 120V| 16.0
208V| 30.0
240V| 34.6
OPERATING MODES
When the humidifier is powered and turned on, the “On/Off” light is illuminated green. When the canister is being filled or replenished with water, the “Fill” light illuminates green. When the canister is being drained, the “Drain” light illuminates green. During initial start-up with a new canister, the humidifier may run through a series of fill/drain cycles until the conductivity of the water is in a range that allows normal operation. During this time, the “Steam” light illuminates green. If the humidifier cannot produce steam at the rated level after trying for 168 hours, the “Steam” light illuminates yellow. The humidifier continues to operate in this state until the rated output is reached. The conductivity of naturally soft water, hard water, and softened water changes as the water heat up, but the internal controller adjusts the water level to maintain a nominal current between the electrodes. Over the life of the canister, minerals that build upon the electrodes will reduce their effective surface area and affect the resistance between them. The operating water level will increase with use until it reaches the high water level probe. At that point, the “Service” light will flash red indicating that the canister needs to be replaced. The humidifier will continue to operate but with reduced output. When the humidifier begins a drain cycle, the fill valve opens to introduce cold water into the canister. This is done to prevent hot water from entering the drain. The drain valve remains open for four minutes to allow all water to drain from the canister. Any time power is disconnected or the humidifier is turned off, the internal timer for start-up and drain cycles is reset. If the humidifier has operated 168 hours without a drain cycle, the drain valve will open and drain the canister. Normal operation will continue. If the humidifier is operating and a power failure occurs, once power is restored, the “On/Off” light will flash green for one minute, then the humidifier will turn on.
END OF SEASON/PERIOD OF INACTIVITY SHUT-DOWN
If the humidifier does not receive a call to operate in 72 hours, the humidifier controller drains the canister. The “Drain” light will remain on until there is a humidity call or 24 hours has elapsed. The humidifier will resume normal operation when a call for humidity is made.
DISPLAY PANEL
TABLE 1 – Display Panel
Indicator| Light| Function
| Off| Humidifier is turned off or not receiving power.
Solid Green| Humidifier is turned on.
Flashing Green| Humidifier is preparing to turn on. Occurs if power
is disconnected, then restored with switch ON. Flashes for one minute.
| Solid Green| Normal Operation. Fill valve is energized allowing water
to flow into canister via fill cup. (Does not illuminate when tempering water during drain cycle.)
Flashing Green| Fill and Drain Valves are pulsing to dislodge mineral build-up in canister. Flashes 10 times in four seconds.
Solid Red
| Fault Mode. Indicates canister needs water but cannot fill. Humidifier shuts down. (Occurs if high water probe does not detect water after fill valve is energized for 40 minutes.)
| Solid Green| Normal Operation. Humidistat is calling for steam and humidifier is operating.
Solid Yellow
| Humidifier is operating but is not delivering steam at rated capacity. Occurs if humidifier has operated for 168 hours at less than rated capacity due to low water conductivity. Light will turn green once water conductivity increases and humidifier is delivering rated capacity.
|
Flashing Green
| Humidifier is preparing to drain. (Fill valve is open tempering water in
canister.) Occurs when humidifier is turned off, at end of season drain (72
hours with no operation) and during forced drain down (168 hours of operation
with no drain activity.)
Fill and Drain Valves are pulsing to dislodge mineral build-up in canister.
Flashes 10 times in four seconds.
Solid Green
| Drain valve is energized and open, draining canister. Valve remains
energized for four minutes.
Indicates end of season shut-down. Occurs if humidifier does not receive call
for humidity in 72 hours. Light remains on for 24 hours.
__**__**
|
Flashing Red
| Canister has reached the end of its life and needs to be replaced. Occurs after humidifier has operated for at least 168 hours and for an additional 24 hours at a current level below 75% of the maximum operating current. Humidifier continues to operate, but at reduced capacity.
Solid Red
| Operational problem with humidifier. Humidifier shuts down. Occurs when unit detects over-current which can be caused by failure to drain or other system failures. Call your heating and air conditioning dealer for service.
HUMIDIFIER CONTROL & OPERATING INSTRUCTIONS
The control provided with your humidifier is mounted either in your return air
duct or on a wall in the living space. The control has a set of contacts that
close when the RH is below the set point. That signal tells the humidifier to
energize the electrodes in the canister to generate steam, provided the indoor
unit blower is on. If the blower activation relay is installed, a call for
humidity will turn on the indoor unit blower.
It is important to anticipate changes in outdoor temperature and adjust the
setting accordingly to avoid excessive condensation when the outdoor
temperature is low. For example, with an outdoor temperature of 20°F, the
correct setting will be 35%. If the temperature is expected to fall to 0°F
that evening, then merely reduce the setting to 25% several hours prior to the
temperature change.
See Table 2 for the recommended settings. These settings, which are based on
years of research, represent a compromise between humidity levels that would
be most desirable for comfort and humidity levels that are suitable for the
protection of your home and to avoid condensation on your windows. For
example, a wintertime indoor humidity of 50% may be considered ideal for
comfort, but unfortunately, it probably would result in condensation, which
can cause damage to your home. Observing the recommended humidity levels on
your Humidifier Control is an important safeguard. Condensation of water on
the inside surface of windows in the form of fogging or frost is usually an
indication of too much humidity. This same condensation can occur in other
areas in your home, possibly resulting in damage.
TABLE 2 – Outdoor Temperature/Indoor Relative Humidity
TABLE 2 – Outdoor Temperature/ Indoor Relative Humidity
Outside Temperature| Recommended RH
+40°F| 45%
+30°F| 40%
+20°F| 35%
+10°F| 30%
0°F| 25%
– 10°F| 20%
– 20°F| 15%
CHECK THE HUMIDIFIER OPERATION
Turn the control knob to the maximum RH setting. Make sure that the water saddle valve is open and that the humidifier is on. The indoor unit blower must be running for the humidifier to function. Once humidifier operation is verified, reduce the Humidifier Control setting to the recommended inside humidity, depending on the outside temperature.
ADDITIONAL INFORMATION
Be sure to keep fireplace dampers closed when not in use. They provide an
excellent escape route for heat, as well as humidity.
On occasion, indoor moisture-producing activities such as clothes drying,
cooking, showers, etc., may raise the humidity level higher than it should be,
even though the humidifier is not operating. Telltale indications are
condensation or frost on cold surfaces such as windows, doors, walls, etc. If
such condensation persists for several hours, your home should be ventilated
to dissipate the potentially damaging excess moisture.
MAINTENANCE
NOTE: The manufacturer of the device recommends that service be performed only by a qualified technician. Contact your installing contractor for service. See Cautions and Warnings on pages 2 and 3 prior to attempting these procedures. Turn the humidifier off and allow the humidifier to drain. Disconnect power before servicing. Inspect humidifiers at approximately 500-hour intervals or several times during the humidification season.
- Check system operation and inspect all plumbing connections and piping for signs of cracks or leaks.
- Inspect the drain line to make sure it is not blocked and has a constant downward slope. Clean or replace if necessary.
- Inspect the steam hose to make sure it has no low spots and has a constant upward slope from the humidifier to the dispersion tube in the duct. If the dispersion tube is mounted below humidifier, inspect drip tee drain.
- Two canisters are available for optimal performance. The Model 8043RP is for typical water while the Model 8043LCRP is designed for low conductivity and 120V installations. The 8043LCRP should never be used with softened water.
TO REPLACE THE CANISTER
Replace the canister annually and when prompted by the “Service” light. Use only genuine replacement part number 8043RP or 8043LCRP.
- Press the On/Off switch to turn the humidifier off. A humidifier will drain for four minutes.
- Allow humidifier to drain. When the green “drain” LED stops flashing, disconnect the main electrical power to the humidifier.
- Remove front panel.
- Pull three wires off posts on top of the canister. (Two large electrode conductors and one water level probe conductor.)
- Loosen the hose clamp at top of the canister.
- Slide hose off the top of the canister.
- Slide canister up and out of drain assembly. Discard canister.
- Remove O-ring from drain assembly using a small screwdriver.
- Inspect drain assembly and remove any debris. See drain valve cleaning procedure in Installation & Maintenance manual.
- Insert new O-ring into a slot in drain assembly. (O-ring is provided with canister.) Dampen O-ring with water before inserting canister. Do not use oil, grease, or any lubricant besides water.
- Make sure the strainer is inserted into the bottom of a new canister.
- Insert canister into drain assembly. Position canister with the label facing outward.
- Slip the steam hose over the top of the canister and tighten the hose clamp.
- Reattach three wires to posts on top of the canister. (Larger electrode conductors are interchangeable.)
- Replace the front panel.
- Inspect the drain line to make sure it is not blocked and has a constant downward slope. Clean or replace if necessary.
- Inspect the steam hose to make sure it has no low spots and has a constant upward slope from the humidifier to the dispersion tube in the duct. If the dispersion tube is mounted below the humidifier, inspect the drip tee drain.
- Restore electrical power to the humidifier.
- Turn the humidifier on and verify green “On/Off” light is illuminated.
- See Start-up Procedure in Installation, Operation & Maintenance manual.
TO SERVICE FILL VALVE
If the water flows from the fill valve is restricted, disconnect the inlet fitting and remove the in-line strainer using small screw from the inlet port. Clean or replace strainer.