Wolf AHU TE - Commissioning - Heat Exchangers and Coils; Heating and Cooling Coil Commissioning

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3064058_201610
AHU TE
AHUW TE
Commissioning
Coolingcoil
(cold water)
Before commissioning the air-handling unit, check the entire pipework for leaks.
- Vent the heat exchanger and the pipework.
- Ensure that condensate can drain off, to prevent the condensate tray from
overowing.
- If appropriate, before commissioning a chilled water cooling coil check whether the
antifreezeconcentrationinthechilledwaterisadequatefortheanticipatedtemperature
range.Whenantifreezeisaddedtothechilledwater,thecoolingcoil’spowerdecreases
inproportiontotheincreaseinantifreezeconcentration.
Theminimumairowvelocityovertheelectricheatingcoilis1.5m/s(otherwiseriskof
overheating).
If the motor is of the multi-speed or variable-speed type, irrespective of the heating power
oftheelectricheatingcoilitisimportanttoensurethattheairowvelocitydoesnotdrop
belowthespeciedminimumevenwhenthemotorisoperatingatitslowestspeed.
It is permissible to install an electric heating coil on the intake side (upstream of the drive
motor/fanasviewedinthedirectionofairow)onlyiftheheatingcoil’sairdischarge
temperaturedoesnotexceed40°C.
Always comply with the applicable safety regulations for electric heating appliances.
Always ensure that the electric heating register shuts down automatically if
the air ow stops. In addition, the electric heating register must be switched
by one or more switching devices (contactors) having a control circuit wired
through the series connected safety temperature limiter. Ensure that at least
one safety temperature limiter is installed at the top inside of the heating coil.
Ensure that the electric heating register is protected against humidity and water.
Note
Note
Electricheatingcoil Topreventoverheating,ensurethattheairowratescomplywiththeminimumvalue
speciedbelow(guresareinm³/h):
Appliance type AHU TE/AHUW TE 21/43 64/96 130/170 210/270 320/380 450
2200 3200 5700 9000 12500 22500
Heatingcoil
(warm water/hot water/steam)
Before starting the air-handling unit, check the entire pipework for leaks.
- Vent the heat exchanger and the pipework.
- Ensure that condensate can always drain freely from steam registers, to prevent
steam hammer from damaging the register.
- To prevent overheating due to inadequate heat transfer, ensure that the fan is running
before you switch on the heating water pump or open the water/steam valve.
- Check the air discharge temperature; max. air discharge temperature with heating
coilonintakesideis40°C;otherwiseriskofmotoroverheating.
Alwaysbearinmindthatsurfacesofheatexchangersandconnectingadaptors
become hot.
Riskofburnsandscalding.
Plate-typeheatexchanger
withdampers
The recirculating air damper must be open and the bypass damper must be closed if
a plate-type heat exchanger with bypass dampers (and extra recirculating air damper)
operates in recirculating air mode. This means that the fresh air induced into the system
is preheated. The outside air damper can be partially closed in recirculating air mode.
Closing the bypass damper means that the outside air is preheated. Opening the bypass
damper provides a means of defrosting the plate-type heat exchanger if ice forms in winter.
Flow rate monitor