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STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Table 55-1:
Steam Injection troubleshooting guide (continued)

Problem

Possible cause

Action

Hunting: Humidity swings above and

below desired set point

• Control system is malfunctioning.

• Faulty or inaccurate humidity controller. Calibrate or replace.

• Poor location of control components. Relocate.

• Incompatible control component(s). Change component(s).

• Automatic valve is hunting.

• Humidifier is oversized. Change to a smaller valve.

• Pressure-reducing valve is not accurately controlling steam

pressure. Repair or replace.

• Boiler pressure is swinging too widely. Adjust.

Space humidity will not rise to

humidistat set point

• Excessive outside air volume

• Check fans, dampers, VAV, etc.

• Steam pressure is too low.

• Manual steam valve is partially closed. Open.

• Strainer screen is partially clogged. Clean.

• Boiler pressure is too low. Adjust.

• Pressure reducing valve is not accurately controlling steam

pressure. Repair or replace.

• Boiler pressure is swinging too widely. Adjust.

• Check fans, dampers, VAV, etc.

• Piped incorrectly. Re-pipe.

• Steam piping is undersized.

• Humidifier is undersized.

• Replace valve with larger capacity valve.

• Replace with larger humidifier.

• Add additional humidifier.

• Automatic steam valve is not

opening fully.

• Valve packing is adjusted too tightly. Loosen and/or replace

packing.

• Adjust valve linkage.

• Check pilot positioner settings.

• Control system is malfunctioning.

Electric:

• Incorrect control circuit voltage. Change transformer.

• Incorrect control signal. Replace component(s) to make all

components compatible.

• Improperly wired. Rewire.

• Incorrect humidity sensor (Barber-Colman units only). Replace.

• Humidity controller is out of calibration or is malfunctioning.

Repair or replace.

• Malfunctioning humidifier temperature switch is not allowing

humidifier valve to open. Replace or readjust.

Pneumatic:

• Humidity controller is out of calibration or is malfunctioning.

Repair or replace.

• Obstructed air line. Clean.

• Malfunctioning pneumatic temperature switch. Replace.

• Air leak in actuator. Repair or replace.

• Compressed air pressure is too low. Adjust.

Continued

Troubleshooting

TROUBLESHOOTING

Содержание AREA-TYPE Series

Страница 1: ...STEAM INJECTION Humidifiers Installation Operation and Maintenance Manual READ AND SAVE THESE INSTRUCTIONS For use with steam boilers...

Страница 2: ...uct 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...

Страница 3: ...mperature switches 16 SINGLE TUBE HUMIDIFIER 20 Configurations 20 Assembly 21 Installation 22 Piping notes 23 Field piping 24 MULTIPLE TUBE HUMIDIFIER 28 Field assembly 28 Installation 29 Piping notes...

Страница 4: ...bank and Multiple tube humidifiers are designed for ducts and air handlers and capable of a wide range of guaranteed non wetting distances AREA TYPE FOR OPEN SPACES Area type Steam Injection humidifi...

Страница 5: ...ces Application dependent non wetting distances MULTIPLE TUBE HUMIDIFIER Suitable for small to large capacity systems 6 5 3989 lbs hr 2 3 1809 kg h Sizes to fit small ducts and large air handlers Shor...

Страница 6: ...tube 7 Dispersion tube Provides uniform steam dispersion across the duct width 8 Thermal resin tubelet Unique tubelets extend into the dispersion tube center so only the hottest driest steam is disch...

Страница 7: ...es any remaining condensate allowing only dry steam to leave the separator 4 Separated condensate drains from the separator to the steam trap 5 The steam valve controls the amount of steam allowed int...

Страница 8: ...difier discharges against airflow Airflow proving switch Duct high limit humidity control for humidifier location C Return airflow 8 to 12 2 4 m to 3 7 m 3 to 5 1 m to 1 5 m Fan A B D C Exterior build...

Страница 9: ...to ensure complete absorption Also since more air flows along the outside of a turn better absorption occurs if the humidifier discharges proportionately more steam in that part of the airstream At b...

Страница 10: ...fication system is within the main air handling unit The secondary humidification system is located close to the point of steam discharge into the secondary area Filter mixing box Before humidifier 50...

Страница 11: ...location has a significant impact on humidifier performance See the recommendations below and Figure 9 1 Note DriSteem recommends that you do not interchange room and duct humidity devices Room humidi...

Страница 12: ...for instructions Condensate from unavoidable heat loss in the distribution system must be removed promptly to eliminate water hammer and degradation of steam quality and heat transfer capability Insta...

Страница 13: ...28 711 mm min Supervised warm up 1 5 pipe diameter 8 203 mm min If pipe is 4 DN100 or larger size drip for 50 of the condensate load at start up If pipe is less than 4 DN100 size drip for 25 of the co...

Страница 14: ...condensate use an inverted bucket steam trap Float and thermostatic F T traps are more prone to water hammer damage with a flooded trap which may occur when lifting condensate Pipe size The size of t...

Страница 15: ...2 305 mm 4 100 mm Steam trap Piping to be same size as separator inlet Separator Isolation valve by others Valve To Multiple tube header inlet mc_042811_1450 Pressurized steam piping guidelines Instal...

Страница 16: ...teel condensate pump recommended when pumping condensate from systems using optional stainless steel components If wasting condensate to drain temper condensate to local code to prevent damage to drai...

Страница 17: ...Drip 4 102 mm Do not use Use if lifting condensate or if steam pressure is 15 psi 103 4 kPa Drop 12 305 mm Drip 4 102 mm Do not use Do not use Do not use Do not use Stainless steel thermostatic trap...

Страница 18: ...trolling humidistat Required 0 007 0 18 mm restrictor Duct high limit humidistat optional Pneumatic airflow switch optional Separator Steam trap Pneumatic temperature switch 12 305 mm min DC 1190 mc_0...

Страница 19: ...until the steam trap has reached operating temperature The pneumatic temperature switch has a self contained air valve operated by a thermal disc that is normally open bleeding off control air pressu...

Страница 20: ...temperature switch 12 305 mm min Normally closed electric modulating valve 120 VAC or 24 VAC Omit transformer when using 120 VAC coil Class 2 transformer by installer used with 24 VAC coil Electric mo...

Страница 21: ...0 F 99 C This switch prevents condensate discharge from a steam injection humidifier during a cold start or if the condensate return main becomes flooded Install the sensing element of the device in t...

Страница 22: ...his configuration This is a right hand configuration to change to a left hand configuration see Figure 20 1 Vertical tube horizontal airflow Use this configuration when there is no access to side of d...

Страница 23: ...rom forming on cool jackets See the installation examples on the following pages before beginning assembly Note Before completing Step 3 determine which way right or left tubelets should point and ins...

Страница 24: ...d before the humidistat See Humidifier placement on Pages 6 8 for location recommendations 7 Install a temperature switch to prevent possible cold start dripping when steam pressure to the humidifier...

Страница 25: ...ontal airflow position tubelets so they discharge steam with the airflow and add 24 610 mm to the non wetting distance 4 Vertical airflow Always position tubelets steam orifices pointing up when insta...

Страница 26: ...ng downstream from strainer should be the same size as strainer 4 100 mm min Drip 3 4 pipe thread DN20 Minimum face height 9 229 mm Isolation valve by others NOTES 1 To avoid metal fatigue allow for d...

Страница 27: ...a holes in top bottom and end of bracket Isolation valve by others Install strainer within 3 1 m of humidifier see Note 4 Steam valve and actuator see Note 4 NOTES 1 To avoid metal fatigue allow for d...

Страница 28: ...in vertical downflow applications See Note 5 on Page 23 SINGLE TUBE HUMIDIFIER Isolation valve by others Steam valve and actuator see Note 4 Install strainer within 3 1 m of humidifier see Note 4 Tra...

Страница 29: ...see Note 4 Piping downstream from strainer should be same size as strainer Steam valve and actuator see Note 4 NOTES 1 To avoid metal fatigue allow for dispersion tube thermal expansion 2 Dashed lines...

Страница 30: ...tube adapter into dispersion tube As this is being done if unit has a silencer squeeze hooks of silencer cage together and slide them into tube adapter allowing them to snap over rear edge of adapter...

Страница 31: ...when steam pressure to the humidifier is cycled See Temperature switches on Pages 16 19 for more information 8 Install the humidistat and or sensors according to the recommendations on Page 9 Install...

Страница 32: ...See header sizing in Table 28 1 7 After the unit is installed secure steam jacket piping to the tube header 8 If steam pressure is less than or equal to 15 psi 103 4 kPa use float and thermostatic F...

Страница 33: ...m min 4 100 mm min 12 305 mm min 4 100 mm min Field piping MULTIPLE TUBE HUMIDIFIER y 4 114 mm min Center assembly in duct See Note 10 on Page 30 y see y note above x See Table 29 1 for minimum tube s...

Страница 34: ...5 mm min Field piping MULTIPLE TUBE HUMIDIFIER Install strainer within 3 1 m of humidifier see Note 4 y 4 114 mm min Center assembly in duct See Note 10 y see y note above x See Table 29 1 for minimum...

Страница 35: ...1074 Field piping MULTIPLE TUBE HUMIDIFIER Install strainer within 3 1 m of humidifier see Note 4 Notes 1 To avoid metal fatigue allow for dispersion tube thermal expansion 2 Dashed lines indicate pr...

Страница 36: ...um tube spacing Secure end of tube to AHU using support bracket 0 421 dia 11 mm holes in top bottom and end of bracket NOTES 1 To avoid metal fatigue allow for thermal expansion of dispersion tubes 2...

Страница 37: ...s Dispersion tubes see Note 3 on Page 30 mc_040711_1705 NOTES 1 To avoid metal fatigue allow for thermal expansion of dispersion tubes 2 Dashed lines indicate provided by installer see Maxi bank optio...

Страница 38: ...length Divide the tubes into equal groups See Figures 41 1 and 43 1 6 When all the dispersion tubes are assembled place the tube assembly into the duct or air handler securing the assembly and tube e...

Страница 39: ...mounted high limit humidistat downstream from the humidifier Set humidistat at 80 90 RH to prevent condensation forming in the duct Mount this humidistat far enough downstream to ensure that injected...

Страница 40: ...ket the discharged steam must blow with the airflow to avoid condensation that may occur when discharged steam contacts the cooler insulated jacket Therefore when using insulated steam jackets in a ho...

Страница 41: ...required to collect condensate from the header assembly Due to the pressure drop across the valve the steam pressure at the header trap is minimal therefore you cannot lift condensate by steam pressur...

Страница 42: ...ection software available at www dristeem com 4 Steam valve and strainer sizes are provided by Dri calc Note 3 5 See Maxi bank option piping notes on Pages 38 and 39 and see Pages 14 and 15 for more i...

Страница 43: ...xi bank option field piping MAXI BANK HUMIDIFIER Install strainer within 3 1 m of humidifier see Note 4 NOTES 1 To avoid metal fatigue allow for dispersion tube thermal expansion 2 Dashed lines indica...

Страница 44: ...le at www dristeem com 4 Steam valve and strainer sizes are provided by Dri calc Note 3 5 See Maxi bank option piping notes on Pages 38 and 39 and see Pages 14 and 15 for more information about trap t...

Страница 45: ...0 mm min 12 305 mm min Install strainer within 3 1 m of humidifier see Note 4 NOTES 1 To avoid metal fatigue allow for dispersion tube thermal expansion 2 Dashed lines indicate provided by installer r...

Страница 46: ...ld piping mc_040711_1805 MAXI BANK HUMIDIFIER Install strainer within 3 1 m of humidifier see Note 4 NOTES 1 To avoid metal fatigue allow for dispersion tube thermal expansion 2 Dashed lines indicate...

Страница 47: ...i bank escutcheon plate air tight seal around the plate and fastener with suitable caulk 6 Install the steam strainer taking the steam supply to the Mini bank humidifier off the top of steam main inst...

Страница 48: ...1 Install a temperature switch to prevent possible cold start dripping when steam pressure to the humidifier is cycled See Temperature switches on Pages 16 19 for more information 12 Install the humid...

Страница 49: ...height 6 If steam pressure is less than or equal to 15 psi 103 4 kPa use float and thermostatic F T traps for the humidifier If steam pressure is greater than 15 psi 103 4 kPa use inverted bucket trap...

Страница 50: ...m and condensate piping as necessary 4 Connect fan power as recommended for a minimum 60 lbs hr 27 2 kg h of steam 120v 60 hz below 1 amp The fan will provide 700 cfm 0 33 m3 s of air 5 Connect the ne...

Страница 51: ...n port Three speed fan Entrained condensate Humidifier separator drain 3 4 DN20 pipe thread 10 254 mm min Strainer see Note 3 NOTES 1 Dashed lines indicate provided by installer 2 Dri calc is DriSteem...

Страница 52: ...10 0 3 1 150 68 6 0 1 8 5 0 1 5 12 0 3 7 6 0 1 8 5 0 1 5 12 0 3 7 6 0 1 8 5 0 1 5 12 0 3 7 200 90 7 0 2 1 7 0 2 1 13 0 4 0 8 0 2 4 7 0 2 1 14 0 4 3 8 0 2 4 7 0 2 1 14 0 4 3 225 102 7 0 2 1 7 0 2 1 13...

Страница 53: ...alve operates freely closes off steam tightly and that the stem packing is not leaking 3 Inspect steam traps and verify all are working properly A blocked steam trap will be cold A blowing steam trap...

Страница 54: ...ION OPERATION AND MAINTENANCE MANUAL Eliminating excess heat from steam jacketed humidifiers OM 21 Humidifier isolation valve by others Modulating control valve OPERATION mc_051011_1630 FIGURE 52 1 SI...

Страница 55: ...ion to the modulating control valve This will eliminate heat gain during the off humidification periods only The jacketing steam valve should be a two position type with a minimum Cv of 5 and set to t...

Страница 56: ...Inspect annually to ensure that a The valve tightly closes off steam b The stem packing is not leaking steam c The diaphragm in the actuator is not leaking air Valve electric modulating Inspect annual...

Страница 57: ...nsate return main Replace with larger piping or pipe condensate to floor drain Inadequate steam trap capacity Replace steam trap orifices as necessary Replace with larger trap Humidifier leaks water D...

Страница 58: ...ace Boiler pressure is swinging too widely Adjust Check fans dampers VAV etc Piped incorrectly Re pipe Steam piping is undersized Humidifier is undersized Replace valve with larger capacity valve Repl...

Страница 59: ...umber of tubes required A noninsulated duct is passing through an unheated area duct surface temperature is too low Insulate ductwork Air cannot absorb steam quantity being discharged Humidifier is op...

Страница 60: ...8 STEAM INJECTION INSTALLATION OPERATION AND MAINTENANCE MANUAL Single tube and Multiple tube humidifiers OM 23 REPLACEMENT PARTS FIGURE 58 1 SINGLE TUBE AND MULTIPLE TUBE HUMIDIFIER REPLACEMENT PARTS...

Страница 61: ...100 7 Medium grit stainless steel wool not shown 300210 8 Replacement tube Consult factory 9 Seal ring brass 1 2 DN15 for Model 60 tube 306360 001 Seal ring brass 3 4 DN20 for Model 70 tube 306360 002...

Страница 62: ...an three speed 400010 3 Valve actuator Consult factory 4 Valve 1 2 NPT DN15 pneumatic with operator 510060 Valve 3 4 NPT DN20 pneumatic with operator 510061 Valve 1 NPT DN25 pneumatic with operator 51...

Страница 63: ...2 DN15 pneumatic with operator 510060 Valve 1 2 DN15 electric 510030 3 Orifice brass not shown 203450 4 Trap float and thermostatic F T not shown 300000 5 Y strainer 1 2 DN15 not shown 300100 001 6 Va...

Страница 64: ...y even if DriSteem has notice of the possibility of such damages By purchasing DriSteem s products the purchaser agrees to the terms and conditions of this Limited Warranty Extended warranty The origi...

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