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Service
MOTOR - MECHANICAL NOISE
NO ELECTRIC HEAT
NO HOT WATER OR STEAM HEAT
WATER CARRY-OVER FROM WET
COOLING COIL ONTO FLOOR,
MOTOR OR FAN HOUSING
WATER INSIDE UNIT
DRAIN PAN NOT PROPERLY
DRAINING
PRE-FILTERS ARE WET
66
Determine if noise is from motor or fan. Isolate motor from fan and check
difference in noise level.
Fan noise transmitted to motor through drive. Reduce fan noise or dampen
noise transmission to motor.
Be sure fan vibration isolator shipping brackets are removed. If still in place
remove shipping brackets to allow vibration isolation of fan and motor.
Manual reset thermal cutout in electric heater control circuit tripped. Check
reason for tripping and correct. Reset manual cutout switch.
Air flow switch interlock not closed. Check air flow sensing tube for proper
location in airstream and for possible damage. Repair or replace air flow
switch and / or sensing tube as required.
Broken electric heating element. Replace element.
Heat limiters blown. Replace heat limiters.
Electric heater circuit fuses blown. Replace fuses.
Defective electric heating circuit contactor. Repair or replace contactor as
required.
Defective hot water or steam valve actuator motor. Replace actuator motor.
Broken control linkage from actuator to valve assembly. Repair or replace
actuator linkage.
Defective hot water or steam control valve. Replace valve.
Airflow too high – See "CFM HIGHER THAN REQUIRED"
Drain Pan full – See "DRAIN PAN NOT PROPERLY DRAINING"
Water spraying out of Drain Pan – "DRAIN PAN NOT PROPERLY DRAINING"
Coil Bulkhead penetrations – Be sure any field penetrations are sealed.
If Intermediate Drain Pans on the coil face are present – Be sure they drain
properly, checking for debris and damage.
Check Auxiliary Drain Pans under coil headers – Be sure they drain
properly into the Main Drain Pan, checking for debris or damage.
If unit shipped in more than one piece – Be sure these field reassembly
joints are properly sealed against rain water and air leaks.
If field piping or electrical conduits penetrate the unit – Be sure they are
sealed properly. The electrical conduits must be sealed internally to
prevent air flow and moisture condensation.
Be sure trap is installed and of correct size and construction –
See Page 22
Be sure unit is installed level on curb, steel or pad.
Check the segment which houses the Drain Pan. Be sure it is under the
correct pressure (positive or negative) and that pressure does not
exceed the design for that segment per the design data sheet in the
submittal.
If Outside Air Hoods are shipped loose – Be sure they are properly in-
stalled and sealed at top flange. Some hoods may be shipped with mist
eliminators or prefilters to be mounted in the hood openings when
hoods are being installed.
If unit has Outside Air Opening – Be sure air flow does not exceed the
design for Outside Air per the design data sheet in the submittal.
YORK INTERNATIONAL
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