Installation instructions
Contents
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3. Internal Drain Outlet Factory installed with hose Page 13 CONTRACTOR 12 Dimensions and Available Models 12 4 Humidifier dimensions Fig 12a 11 5 8 R THERMOLEC o 2 12 2 Available models Fig 12b Capacity Lbs Hr bun PS Acu 5 SP Tas Page 14 13 Detailed View and Wiring View of the top of the unit Fig 13a Electric Black Steam Outlet Valve Heating Element Black Thermal Cut out High Level Level Sensors Yellow White Blue Blue Red Red Water White Page 15 CONTRACTOR View and list of the wire harness color and function Please see Fig 13b amp Fig 13c c o g Blue Red Red White Yellow Overflow Sensor G d W ae 3L On Standby LED 0 On Standby pes u Q Switch Fan LED Alarm LED L Steam LED Neutral connection oc pj ri LED Transformer Fan 9 relay OE UL EET ON JON M Element 900690 12
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5. in front of the unit 15 1 Remove the cover by turning the two 1 4 turn screws to the left and pull the cover towards you 15 2 Remove the white wire connected on the water pan at the bottom of the unit This is the overflow sensor 15 3 Remove the water pan by lifting the front off its holding screw and pull towards you Do not remove those screws from the humidifier middle wall 15 4 The humidifier must be installed on a vertical surface Because of the length of the steam hose supplied select the location of the unit as close as possible within a maximum of 4 feet of the diffuser Please see Fig 15 a for necessary clearances around the humidifier CONTRACTOR AGU STEAM STEAM HUMIDIFIER R THERMOLEC 12 15 5 drain pipe has to be installed under the unit and connected to the main house drain We recommend a 1 minimum 1 0 tube or standard 1 1 2 1 0 ABS plumbing tube to do the installation Please Page 19 also install a siphon P trap with a drain cap The two flexible tubes coming from the humidifier and which will be inserted in the rigid pipe require a minimum free vertical length of 18 It is very important to leave an air gap between the rigid pipe and the tubes to allow the siphon to function properly The flexible tubes cannot touch any water contained in the drain pipe Please see Fig 15b Water Hammer Absorber Water intake AGUzSTEAM M T
6. done by a qualified electrician and must conform to procedures regulations and local codes 18 1 A dedicated breaker in the main panel or fused disconnect must be installed 18 2 The voltage of the available power supply must be the same as the one required by the humidifier 18 3 Ensure that the wire size and protection equipment conform to the sizes required by the Electrical Code 18 4 Wire according to the wiring diagram supplied in the cover of the unit 18 5 Adjusting the DIP switches located on the lower right corner of the circuit board will change how the humidifier handles automatic tank flushes The humidifier will completely drain and refill with fresh water after a predetermined number of refill cycles Every time the unit replenishes the tank while producing steam is counted as one cycle The table below shows how to set the DIP switches in order to make the unit flush the tank at different intervals Every 30 cycles equals approximately 5 hours of operation NOTE Cycles are cumulative across humidistat cycles This means that if the humidistat satisfies when the counter is at 15 cycles the count will resume from 15 upon a new call for humidity After the number of cycles as set by the DIP switches the tank will drain and refill If there is no call for humidity for 7 consecutive days the tank will be drained and wait for future demand from the humidistat Switch numbers on top of DIP switch not the ae below the DIP swi
7. stop and drain Please note that when using an ACU STEAM electronic humidistat if the relative humidity is extremely low the humidifier may still run with the knob at the minimum setting because of a range limiter inside the cover If this occurs you will need to remove the humidistat cover by pulling it off and turn the knob completely counter clockwise The humidifier should now stop and drain Wait until the unit has cooled before proceeding with the following steps 8 2 Before doing anything TURN THE MAIN POWER OFF 8 3 Remove the cover by turning the two 1 4 turn screws to the left 8 4 Unplug the white quick connect wire connected on the water pan at the bottom of the unit This wire is connected to the overflow sensor Please see Fig 8a Main drain Tube White Wire CA S 2 Pull 1 Lift P x Overflow Sensor Overflow Pan L Overflow Drain Tube Rigid Drain Pipe Fig 8a Page 8 8 5 Pull the plastic tube attached to the bottom of the unit out of the rigid drain pipe on the wall You do not have to remove the plastic tube attached to the bottom of the pan Remove the overflow pan from the unit by slightly loosening the front screw then lifting the front of the pan off the screw and pulling it towards you Please see Fig 8a Remove the main drain tube from the rigid drain pipe attached to the wall and check that they are both clean and clear from deposits 8 6 Check that the water tank i
8. 3 0FF Drain LED Relay FAN H STAT A Connect the humidistat supplied with the humidifier to the control DIP switch to adjust the board according to the wiring diagram supplied tank flush interval Fig 13b Description of Wire Harness Color Grounds the electronic board to the tank for the level sensors Blue Blue Powers the electric valve with Pair 24 VDC Use red Overheat signal Pair White Reads the low water level Yellow Reads the high water level Fig 13c Page 16 Note Please read sections 14 and 15 before proceeding 14 Installing the Steam Hose and the Fan module NOTE This unit is supplied with 2 feet of steam hose and therefore the distance between the fan module and steam generator should be less than two feet see figure 14a Longer hoses at a length of 4 feet are available from Thermolec For distances up to 12 feet a section of insulated copper pipe can be connected between two pieces of steam hose fan module Acu Steam steam generator Fig 14a 141 The fan distribution module must have a minimum clearance of 2 feet from the ceiling or adjacent walls and a minimum clearance of 3 feet in front of the faceplate With these distances in mind measure a rectangle of 9 1 8 wide by 6 1 4 high The rectangle needs to be level with respect to the floor Drill a small pilot hole through each corner from the faceplate wall and through the other side of the wall With a
9. HERMOLEC 63 2 Warning These two tubes cannottouch Min length 18 water in the drain pipe Keep a minimum Keep this hose straight distance of 6 between the end of the For the correct operation of the tubes and any water in the drain pipe at siphon this tube must have a all times Immersing the tubes in water minimum length of 18 An air will interfere with draining and affect the gap is mandatory between the operation of the unit tubes and the rigid drain pipe Rigid pipe Mn aem etes 6 Minimum in _ Water Fig 15b 15 6 Since the unit is equipped with water level sensors it is important to install it level from left to right and from back to front 15 7 Draw a level horizontal line on the wall and install two screws 8 minimum spaced at 11 5 8 from each other to hook the humidifier on the wall then install two screws at the bottom of the unit and tighten them partially 15 8 Level the unit and tighten the four screws firmly REMINDER Page 20 Never install the humidifier directly the furnace body as this could void your furnace warranty 16 Installing the Water Supply Important Notes e Turn off the main water supply before beginning The supply valve not supplied must be attached to a cold water pipe only close to the humidifier Since the unit is draining hot water cold water is added to reduce the te
10. User and Maintenance Manual for the Homeowner and Installation Instructions for the Contractor ACU STEAM Split 464 Steam Humidifier by Thermolec AGU STEAM STEAM HUMIDIFIER R THERMOLEC Please read this manual carefully before beginning installation Important Notice to the Contractor Once the installation is complete please leave this manual with the customer for future reference July 2010 V1 0 1 Warnings and Disclaimer Installation Precautions Please read and understand the warnings and instructions fully before you begin this installation and keep them handy for future reference The manufacturer will assume no responsibility and the warranty will be void if the installer or the user does not adhere to the following precautions 1 1 This humidifier will be connected to and used under water pressure and it must be installed in such a way that if a leak occurs the water could not cause any damage to the property Make sure all water connections are properly installed or a water leak could occur 1 3 Do not install a humidifier where the surrounding temperature may be 32 F 0 C or colder Freezing water will damage the humidifier and burst the supply pipe resulting in home damage 1 6 Do not install a humidifier if the city water pressure exceeds 90 psi Check the local codes related to pressure reduction 1 8 The installation wiring and plumbing of the humidifie
11. arranty period I 10 5 Thermolec Ltd will be held responsible for accidental or consequential damages nor for delays nor for damages caused by the replacement of the said defective steam humidifier Thermolec Ltd 2060 Lucien Thimens St Montreal QC H4R 1L1 Tel 514 336 9130 Fax 514 336 3270 Help line for technical assistance during business hours Monday to Friday 8 30am to 5 00 pm Eastern Time 1 800 336 9130 Web site www thermolec com Page 12 Detailed Instructions for the Contractor 11 Unpacking the Unit 11 4 Contents Please inspect the carton s contents and report any missing parts or damage immediately 1 Humidifier 1 fan housing 1 plastic faceplate 1 Main Drain tube 32 long already installed and coiled inside the unit 1 Steam hose 2 feet long x 1 inch I D 1 Instruction and maintenance manual 1 Plastic bag containing installation material and hardware as follows 2 Adjustable hose clips for the steam hose 1 Water hammer absorber Red rubber hose with two brass fittings 1 Small bag 105 1 Water supply tube 1 4 dia x 7 long 1 Overflow Drain tube for the pan 7 16 dia x 24 long NOTE The electronic humidistat and the outdoor reset sensor are optional They may be purchased separately 11 2 Water Tank Detailed View Please see Fig 11a Top View Water Level Sensors Electric Valve Steam Outlet Tank Cover Fig 11a D Water Tank
12. ating the status of the humidifier Please see Fig 5a Please refer to Article 5 2 for the description of the functions The red pilot light which is a warning light can either glow all the time or flash when activated In case of error the humidifier enters stand by mode The flashing of the pilot lights indicates which error happened The error recognition sequence is as follows e The green pilot light near the power button blinks once The red light flashes a certain number of times this is the error code A pause with no light at all Another blink of the green light once e Another series of flashing of the red light e And so on until the condition is reset or service is performed e Shutting the power OFF at the breaker in the main panel or depressing the power button until the green light is fully on will reset the error code Mode On Standby Green Fan White Warning Red Steam White Fill Blue Drain Yellow Fig 5a 5 2 The ACU STEAM humidistat also has two pilot lights to indicate the current status The green light is lit when the humidistat is demanding for humidity thus activating the boiling cycle The red light indicates a warning and reproduces the same warning code as the red light on the humidifier control panel If ever the red light is lit or flashing on the humidistat you know immediately that the humidifier needs attention Display Status Description On Standby Green light OFF The
13. e humidifier and let the water pressure enter the system 20 6 Follow the water supply path completely and carefully check for leaks at the fittings 20 7 Turn the breaker ON to supply power to the humidifier The green light comes ON to confirm that the unit is ready to work 20 8 Test of the On Standby button Press the white button once The green light goes OFF then flashes indicating that the unit is in standby mode but still powered Press the white button again and keep it depressed for 3 seconds to power the humidifier The green light will come ON confirming that the unit is ready to work 20 9 Turn the humidistat clockwise past the middle of the scale to create a demand for humidity 20 10 The tank fills to the proper water level 20 11 The fan control starts the fan to move the air as the humidifier starts boiling water and produces steam If the fan cannot start the humidifier suspends the ongoing operation If the air pressure is insufficient the unit will stop by itself Please note that it may take a few minutes to bring the water to a boil The steam exits the water tank through the steam outlet and steam hose 20 12 The steam moves through the hose to the diffuser and is distributed by the fan 20 13 As water evaporates in the tank the electric valve opens as needed to maintain the proper water level 20 14 When the humidity reaches the desired level the humidifier stops producing steam and automatically Page 24 drain
14. em to them and mention the error code you observed on the front panel They may help you solve the problem over the phone If needed they will fix the problem themselves or call our technical service 6 5 Should you attempt to look at the unit yourself please apply all appropriate safety measures Shut the main power OFF and wait for the unit to cool before you open it T Description of Error Codes Number of flashes of the Error Description red light Continuous There is water the pan under the tank Problem with the water level sensors inside the unit Inadequate water supply Inadequate drainage Fan not running emperature inside the ank exceeded the high emperature limit and he safety switch has ripped Humidifier Status Risk of overflow Humidifier stops itself Internal problem Humidifier cannot read the water level properly and stops itself Humidifier cannot fill properly and stops itself Heating elements and supply valve are switched off Humidifier cannot drain properly Risk of overflow the unit stops itself Humidifier stops itself his is a very serious condition he humidifier stops itself and cannot restart without service Page 7 Actions to be Taken by the Owner urn the main power OFF then Open the unit and check for leaks Check the drain tube Close the supply valve and call for service urn the main power OFF then call your service com
15. h hose Fig 2c Page 2 3 Startup 3 1 The startup of the humidifier is done in as follows Put the main power ON at the electrical panel The green pilot light comes ON The humidifier is ready to work Open the water supply valve Adjust the knob on the humidistat Working Principle 3 2 Unlike other types of humidifiers which produce humidity by passing warm air on a water curtain a rotating pad or another type of media this humidifier produces humidity from steam dispersed directly into the air LL 2 Lu I 3 3 A humidistat installed on the wall controls the unit You set the knob of the humidistat according to your need or comfort Please read the next section about the humidity control 3 4 When the humidistat senses a need for humidity it starts the humidification process 3 5 The tank fills with water 3 6 The electronic control starts the fan to move the air as the humidifier starts boiling water and producing steam If the fan cannot start i e there is no air movement to transport the steam or insufficient air pressure the humidifier stops itself Please note that it may take a few minutes to bring the water to a boil The steam exits the water tank through the steam hose moves to the steam diffuser installed in the fan module and is spread into the room 3 7 As water evaporates the electric valve opens as needed to replenish the water in the tank 3 8 When the humidity reaches
16. he scale corresponds to the middle of the comfort zone approximately 3596 RH Relative Humidity z I 4 3 If you are using a mechanical or other humidistat the adjustment according to the outside temperature will have to be done manually For your information the following table shows the recommended setting of the humidistat according to the outside temperature Please see Fig 4a 5 TEAM Outside Temprature Recommended Setting 22 F 309 15 3 F 25 20 4 F 209C 25 5 F 15 C 30 14 F 10 35 above 23 F 5 4096 Fig 4a AY 4 4 No matter which humidification system you are using please do not forget that the humidity level cannot adjust quickly It may take some time to build up the humidity to your comfort level Depending on the dryness of the house carpets furniture drapes and wood will absorb moisture before you can feel the change 4 5 If the house remains unoccupied during the winter season set the humidistat to the minimum set point in order to prevent condensation NOTE The best location for the humidistat is at least two feet away from the faceplate and at a level that is lower than the bottom of the faceplate Page 4 5 Functions of the Electronic Circuit 5 1 The electronic board located inside the unit controls all the humidifier functions The front panel is equipped with pilot lights indic
17. humidifier has no power Breaker is OFF 5 Blinking The humidifier has power but is in standby mode ON The humidifier has power and is functional White button Press to put the humidifier in stand by mode The green light is blinking Press and keep depressed 3 seconds to power or reset the humidifier The green light is ON Fan White light ON The fan control is activated Page 5 z lt lt T Warning light 602 Steam 4 White light Filling cycle 54 Blue light Draining cycle Yellow light White button ON ON ON ON An abnormal condition occurred Please refer to the error code table in Section 7 The humidifier is heating water to produce steam The electric water valve is open thus filling the humidifier The humidifier is in draining mode Not active on residential models Page 6 6 What To Do if Malfunction Occurs 6 1 Shut the main power OFF and restart the humidifier to see if the error code disappears 6 2 If you see a water leak follow the water supply tube and close the valve installed on the water pipe located near the humidifier 6 3 Please refer to the error code table to identify the possible cause of the malfunction and the actions that you can take 6 4 Should the problem persist please call your service company They are the best qualified to help you quickly Describe the probl
18. mperature before sending the water to the drain e We recommend installing a quarter of a turn shut off valve not supplied near the unit case of well water or other water containing particles we also recommend installing a little strainer in the water line to protect the solenoid valve 16 1 The water intake fitting on the top of the humidifier must be wrapped with teflon tape Screw the water hammer absorber piece of red rubber hose with two brass fittings onto the water intake on the top of the humidifier without stripping Please see Fig 16a Also use the same double wrench method for tightening Water Hammer Absorber Intake Fig 16a 16 2 the other end of the water hammer absorber connect the water supply tube using the same type of fitting used on the water supply valve Tighten the compression nut without stripping with two wrenches one to hold the water hammer end and one to turn the compression nut Please see Fig 16b NOTE The brass sleeve supplied in kit 105 is to be used only if the plastic supply tube is replaced by a copper tube Either system works with this humidifier but only plastic tubing is supplied Keep the supply valve closed for now you will open it during the start up procedure Page 21 CONTRACTOR tc 2 18 Making Electrical Connections NOTE All internal wiring is done at the factory All external wiring shall be
19. n finished turn the main power back ON Page 10 9 Preventative Maintenance 9 1 Preventive maintenance to be performed every two years In order to avoid problems due to accumulation of deposits we suggest that you replace the centre metal tube the silicone drain tube and the low level sensor We also suggest you replace the round o ring gasket around the tank All these components are available in a kit E 9 2 for the Summer Season Shut the main power OFF e Shut the water supply valve e Perform a complete maintenance as described in section 8 Dry the inside of the tank z Page 11 10 Warranty 10 1 Thermolec Ltd warrants against defects in material and workmanship the steam humidifier and all its components for one 1 year after date of shipment from its factory 10 2 claim under this warranty shall be considered only if the product has been installed and operated in accordance with Thermolec s written instructions ER WN 10 3 Any misuse of the system or any repair by persons other than those authorized by Thermolec carried out without its written consent voids this warranty 10 4 Thermolec responsibility shall be limited in any case to the replacement or repair in its factory or in the field by its own personnel or by others chosen by Thermolec at its option of such steam humidifier or parts thereof as shall prove to be defective within the w
20. pany urn the main power OFF then Check the water supply circuit Check if the water supply valve is open Call your service company urn the main power OFF then Close the supply valve Call your service company urn the main power OFF then Call your service company urn the main power OFF then Call your service company Automatic Reset when witching main power ON again Automatic Reset when witching main power ON again Automatic Reset when witching main power ON again Automatic Reset when witching main power ON gain Automatic Reset when error conditions disappear Only the service company an reset the unit after hecking all functions NER m HOM WNE Lu HOM 8 Cleaning the tank As with any device evaporating water some minerals normally dissolved in the water may create deposits inside of the unit Even though the unit is draining and cleaning itself during normal operation it will require a bit of maintenance from time to time WARNING e The water tank and its contents can become extremely hot Please be careful when you handle it e The tank may have water inside 8 1 Since the tank is drained when the demand of the humidistat has been satisfied there should be approximately one inch of water if the unit is not operating But if the humidistat is calling for steam and the water is boiling turn down the humidistat The humidifier will
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22. r must comply with national and local electrical plumbing and building codes Electrical wiring and water tubes must not come in contact with sharp edges or hot surfaces 0 Make certain an appropriate drain system is installed and there is no resistance to the flow of the discharged water 1 11 Do not set the humidity level higher than that recommended or condensation damage will occur 1 Always shut the power off before you start the installation or when doing maintenance An electric shock from 120 or 240 volts could cause serious injury 1 14 When you perform maintenance please be careful because the unit can be extremely hot Always allow enough time for the unit to cool down 1 15 prevent electric shock or injuries never operate the humidifier without the cover as there are high voltage and hot components inside 1 16 This humidifier will only work with non demineralized water The maximum water supply temperature is 86 F 30 C HOME OWNER i 4 1 Instructions and User Manual for the Homeowner 2 View of the unit 2 1 External view of the humidifier Fig 2a ACU STEAM STEAM HUMIDIFIER R THERMOLEC 2 2 Water Tank Top View Please see Fig 2b 2 3 Water tank Side View Please see Fig 2c Water Level Sensors Electric Valve Steam Outlet Tank Cover Internal Drain Outlet Water Tank Factory installed wit
23. s In order to eliminate the residues and keep the tank as clean as possible the humidifier also drains after a certain number of boiling refill cycles If there is still a demand from the humidistat after draining the tank refills and starts to produce steam again 20 15 When the humidistat is satisfied the fan continues to run for a short period of time in order to eliminate the steam from the ducts 20 16 When everything is working fine put the cover on the unit and attach it by turning the 1 4 turn latch to the right 20 17 Please don t forget to leave this instruction manual with the customer 20 18 Sequence of Operation i Draining Cycle Ue Boiling Cycle 1 2 3 4 5 6 7 8 Bj Up to 9 minutes total for drain cycle 1 Steam cycle see below The unit will repeat this cycle until the humidistat is satisfied or the selected number of cycles is reached before going to the draining cycle If there is no more demand for humidity the unit will automatically go on Stand By mode until the next demand If there is no demand for 7 days the unit will flush and drain the tank NOTE The Acu Steam board has a memory that remembers the last sequence of operation when the power is turned off hence the unit might start at step 2 or 3 when you put the power back on Also timings may slightly vary depending on the capacity of the unit 1 5 kW 3 kW or 4 kW the pressure of the water inlet and the quality of the wate
24. s not too hot to handle Unfasten the latch around the water tank and remove the tank from the main body of the humidifier by pulling it down When you remove the tank it is possible to clean the round o ring gasket but don t discard it NOTE This round gasket is mandatory and the unit will not work properly without it 8 7 Soap or vinegar can be used to clean the water tank the heating element and the tips of the level sensors Other cleaning products used to remove scale lime or calcium are also available on the market but DO NOT use a metal brush or any strong acids to clean the tank as they may damage the stainless steel 2 O m 8 8 Once completed reinstall the round gasket around the water tank collar Please see Fig 8b Align the two arrows located at the front of the tank and the fixed part while lifting the tank in place Please see Fig 8c Apply even pressure to secure the tank properly in the top part Then close the latch holding the tank in position Verify that the o ring gasket and tank are seated properly T 8 9 8 10 8 11 8 12 8 13 Put the overflow pan under the tank by sitting it back on its holding screws Reconnect the white wire of the overflow sensor on the water pan Put the overflow and main drain tubes back into the rigid drain pipe attached to the wall Put the cover back on the humidifier and lock it with the two quarter turn screws Whe
25. saw cut out the rectangle from corner to corner Take care not to drill through or cut any electrical wires or plumbing Please see figure 14b front opening faceplate side min 1 3 4 ole mW back opening e pilot hole drilled through entire wall I 12 3 4 Fig 14b 14 2 The opening at the back of the wall must be at least 1 3 4 wider on each side 2 lower at the bottom and flush with the top of the 4 pilot holes Mark these points to make a larger rectangle and cut it out Page 17 CONTRACTOR 14 3 Attached the mounting flanges to the fan module with the screws provided but do not tighten the screws so that the flanges are able to slide along the slots Slide the fan module into the wall until the front edge is flush with the wall figure 14c Tighten the screws holding the tabs so that the front remains flush with the wall Level the unit and screw the flanges to the wall 14 4 Push the faceplate on the front until is snaps into place Check to be sure that the faceplate completely covers the opening in the wall Once the steam generator is installed connect the steam hose between the difuser in the fan module and the tank in the steam generator with the clamps provided and wire the fan module according to the wiring diagram near the end of this booklet tc 18 15 Installing the Humidifier For ease of service keep a minimum space of 24
26. tch Cycles Before Tank Flush 0 DEFAULT G Fill LED f d OFF oo Drain LED DIP switch Page 22 19 Installing and Connecting the Humidistat 19 1 See wiring diagrams in section 21 for proper connection If you are using an ACU STEAM electronic humidistat with outdoor sensor please refer to the instructions included with the humidistat If you decide to use a standard mechanical humidistat connect the mechanical humidistat between the terminals marked GND ground amp IN input on the humidifier electronic board Page 23 CONTRACTOR lt H Z 20 Start up and Test Procedure 20 1 Take the 5 16 dia plastic tube previously uncoiled and push one end on the connector located at the bottom of the overflow pan Please see Fig 20a and Fig 20b Fig 20b 20 2 Install the overflow pan under the tank by sliding it on its holding screws You don t have to tighten the SCrews 20 8 Reconnect the white wire for the overflow sensor on the water 20 4 Cut the two drain tubes and insert them in the rigid pipe Note that the main silicon drain tube must have a minimum length of 24 below the bottom of the unit to allow the siphon to work properly It is important to leave an air gap between the soft tubes and the rigid pipe 20 5 Turn the handle of the water supply valve fully counter clockwise to bring water to th
27. the desired level the humidifier stops producing steam and automatically drains In order to eliminate the residues and keep the tank as clean as possible the humidifier also drains after a certain number of boiling refill cycles If there is still a demand from the humidistat after draining the tank refills and starts to produce steam again This process is part of the self cleaning feature 3 9 When the humidistat is satisfied the fan continues to run for a short period of time in order to eliminate the steam from the ducts and the unit goes to ready mode waiting for the next call from the humidistat Page 3 4 How to Control the Humidity 4 1 Humidity level and comfort are personal matters but it is generally acknowledged that a Relative Humidity of 35 40 is desirable However you should take the outside temperature into consideration before setting the humidity level in order to avoid condensation on the windows Usually a narrow strip of condensation around or at the bottom of the window is considered as normal ER 4 2 If you installed an ACU STEAM humidistat and an outdoor sensor this adjustment will be done automatically The outdoor sensor reduces the setting of the humidistat according to the outdoor temperature during cold days without having to set the humidistat knob manually It does the opposite during mild days Please see Fig 4b for the percentage of relative humidity on the electronic humidistat label The middle of t
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