Air Handlers Envirofresh Series Installation, Operation & Maintenance Instructions Manual

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INSTALLATION, OPERATION &

MAINTENANCE INSTRUCTIONS FOR:-

SERIES ENVIROFRESH

AIR HANDLING UNITS

CONTRACT No :

PROJECT REF :

AIR HANDLERS LIMITED.

Alfred Proctor House, Bute Street

Weaste, Salford, M50 1DU

TEL :- 0161 745 8888

FAX :- 0161 925 9900

mailto:enquiries@airhandlers.net

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Summary of Contents for Air Handlers Envirofresh Series

Page 1 INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS FOR:- SERIES ENVIROFRESH AIR HANDLING UNITS CONTRACT No : PROJECT REF : AIR HANDLERS LIMITED. Alfred Proctor House, Bute Street Weaste, Salford, M50 1DU TEL :- 0161 745 8888 FAX :- 0161 925 9900 mailto:enquiries@airhandlers.net...
Page 2: Health And Safety
HEALTH and SAFETY Working Conditions and Pre-Installation Check This section deals with the hazards that could be encountered when any work is carried out on the equipment for which this manual is written. Therefore the following points should be observed to avoid any injuries or health hazards. The unit shall be checked to ensure that: ...
Page 3: Installation
No responsibility can be held for damage sustained during the unloading from the delivery vehicle or on the site thereafter. All claims for damage or short delivery should be advised to AIR HANDLERS NORTHERN LTD. in writing within five (5) days of receipt.
Page 4 MAINTENANCE OF EQUIPMENT HELD IN STORAGE CONDITIONS FOR A PERIOD UP TO 2 YEARS Unit Interior and Exterior Surfaces Interior If ducting is not connected it is essential that all inlets and discharge openings are completely sealed. Exterior The exterior shall be kept free from falling building materials, dampness or extreme cold or heat.
Page 5: Fan Section
FAN SECTION Pre-Start Checks After assembly of Air Handling unit the following checks should be made. Refer to Data Chart on General Arrangement drawing for specific details. Isolate electric supply to fan-motor before entering the fan section. Check pulleys/bushes are secure on shafts and that key is fitted. ...
Page 6: Electric Motors
ELECTRIC MOTORS It is advisable to have a monthly inspection of the motor operation. Regular cleaning of the motor is necessary during its service. Care must be taken to prevent moisture, dust, etc from entering the motor. Ensure that adequate grease lubrication is provided for the bearings when the motor is in operation.
Page 7 BELT TENSIONING INSTRUCTIONS Tensioning Forces Belt Section Force required to deflect belt 16mm per metre of span Small Pulley Diameter Kilogram Force 56-95 1.3-2.0 100-140 mm 2.0-2.5 80-132 mm 2.5-3.6 140-200 mm 3.6-4.6 112-224 mm 4.6-6.6 236-315 mm 6.6-8.7 224-355 mm 8.7-11.7 kg 375-560 mm 11.7-15.3 kg...
Page 8 & return bends of the coil. Damage to fins can be corrected by use of a fin comb (available from Air Handlers) all coils should be installed level and upright, unless otherwise specified. Care must be taken to ensure the following conditions are satisfied:- Water flow &...
Page 9 Analysis shows that steam pressure must be reduced dramatically to achieve a slight lowering of temperature. In most applications this can result is sub-atmospheric pressure in the coil, while as much as 75% of full condensate load has to be handled by the steam trap.
Page 10: Air Filter(S)
0-15pisg (0-100kpa above atm.) at the control valve inlet: size the trap for twice the full condensate load (coil condensing rate at maximum design conditions) at 0.5psi (3kpa) pressure differential. 16-30psig (110 to 200kpa above atm.) at the control valve inlet: size the trap for twice the full condensate load at 2psi (14kpa) pressure.
Page 11: Routine Maintenance Schedule
I.E.E. Regulations and local by-laws. Failure to notify AIR HANDLERS LIMITED of equipment damaged on receipt in  writing within five (5) days.
Page 12  Modifications to designed arrangement or performances without the prior written approval of AIR HANDLERS LIMITED. Damage caused to equipment on site through lack of adequate protection from the  elements or misuse by other trades. Failure to observe all normally accepted engineering practices during installation, ...
Page 13: Refrigeration Maintenance
Refrigeration Maintenance SAFETY WARNING: Ensure that all power to the unit is switched off before carrying out any servicing or maintenance task. Only trained and qualified service personnel should repair or service air conditioning equipment containing a refrigeration system. Follow all safety codes. Wear safety glasses and work gloves. Extinguish any cigarette or naked flame.
Page 14: Troubleshooting - General
Troubleshooting – General FAULT POSSIBLE CAUSE REMEDY / ACTION Unit not operating. No power to unit. Check isolator, mains supply. No Supply or Extract fans Time clock output. Check settings. running. Inspect fireman‟s panel. Fire link open. Defective damper end Check actuator operation and end switch switch.
Page 15 ENVIROFRESH SHC/TA Troubleshooting – General FAULT POSSIBLE CAUSE REMEDY / ACTION Low cooling output. Dirty filters. Replace filters. Compressor fault. Refer to compressor section. Cooling hold off stat. Check operation and settings. Indoor coil freezing. Check operation and settings of the indoor frost protection stat.
Page 16 ENVIROFRESH SHC/TA Troubleshooting – Refrigeration FAULT POSSIBLE CAUSE REMEDY / ACTION Compressor not operating No power to compressor Check fuses, MCBs, contactors, and control circuit wiring. Step energised on controller. Check air flow failure switches. Seized compressor, Check delay timer operation, check controller timer operation.
Page 17 ENVIROFRESH SHC/TA Troubleshooting – Refrigeration FAULT POSSIBLE CAUSE REMEDY / ACTION Suction pressure too low. Reduced airflow. Check volumes, change filters. Clogged filter drier. Replace. Obstruction in expansion Inspect, clean or replace. valve. Insufficient cooling (High suction, low head) 4 port valve not fully Try to free by valve by operating or engaged or internal leak.
Page 18 AHU - HEALTH AND SAFETY REQUIREMENTS Manufacturers Responsibility Fan section access - All access doors allowing entry to the fan section are to be fitted with one lockable door handle to prevent unauthorised access. Additionally these doors are to display a suitable warning label. Electric Heater access - Non lockable lift off electric heater access panels are to display a suitable electric warning label.