31
Complete system shutdown may be caused by loss of main pow-
er, open compressor internal overload, open low-pressure or
high-pressure switch, or a fault detected by the CADM logic.
Compressor operation without cooling may indicate the com-
pressor’s ASTP feature is active; disconnect unit power and al-
low compressor to cool. See Service section for further details.
COOLING, UNIT WITH ECONOMIZER
Refer to fan coil unit installation instructions and economizer
accessory installation instructions for operating sequences
when system is equipped with accessory economizer.
HEATING
Refer to fan coil unit installation instructions and accessory heat-
ing device installation instructions for operating sequences in
heating mode.
MAINTENANCE
These items should be part of a routine maintenance program,
to be checked every month or two, until a specific schedule for
each can be identified for this installation:
Quarterly Inspection
(and 30 days after initial start)
INDOOR SECTION
• Condenser coil cleanliness checked.
• Return air filter replacement
• Outdoor hood inlet filters cleaned
• Belt tension checked
• Belt condition checked
• Pulley alignment checked
• Fan shaft bearing locking collar tightness checked
• Condensate drain checked
Seasonal Maintenance
These items should be checked at the beginning of each season
(or more often if local conditions and usage patterns dictate):
AIR CONDITIONING
• Condenser fan motor mounting bolts tightness
• Compressor mounting bolts
• Condenser fan blade positioning
• Control box cleanliness and wiring condition
• Wire terminal tightness
• Refrigerant charge level
• Evaporator coil cleaning
• Evaporator blower motor amperage
HEATING
• Power wire connections
• Fuses ready
• Manual-reset limit switch is closed
ECONOMIZER OR OUTSIDE AIR DAMPER
• Inlet filters condition
• Check damper travel (economizer)
• Check gear and dampers for debris and dirt
SERVICE
Refrigeration System
COMPRESSOR OIL
Servicing Systems on Roofs with Synthetic Materials
POE (polyolester) compressor lubricants are known to cause
long term damage to some synthetic roofing materials. Expo-
sure, even if immediately cleaned up, may cause embrittlement
(leading to cracking) to occur in one year or more. When per-
forming any service which may risk exposure of compressor
oil to the roof, take appropriate precautions to protect roofing.
Procedures which risk oil leakage include but are not limited to
compressor replacement, repairing refrigerants leaks, replacing
refrigerant components such as filter drier, pressure switch,
metering device, coil, accumulator, or reversing valve.
Synthetic Roof Precautionary Procedure:
1. Cover extended roof working area with an impermeable
polyethylene (plastic) drop cloth or tarp. Cover an approx-
imate 10 x 10 ft (3.3 x 3.3 m) area.
2. Cover area in front of the unit service panel with a terry
cloth shop towel to absorb lubricant spills and prevent run-
offs, and protect drop cloth from tears caused by tools or
components.
3. Place terry cloth shop towel inside unit immediately under
component(s) to be serviced and prevent lubricant run-offs
through the louvered openings in the base pan.
4. Perform required service.
5. Remove and dispose of any oil contaminated material per
local codes.
LIQUID LINE FILTER DRIER
The factory-provided filter drier is specifically designed to op-
erate with Puron refrigerant. Replace the filter drier with facto-
ry-authorized components only with a filter drier with desic-
cant made from 100% molecular sieve grade XH-11. Filter dri-
er must be replaced whenever the refrigerant system is opened.
When removing a filter drier, use a tubing cutter to cut the drier
from the system. Do not unsweat a filter drier from the system.
Heat from unsweating will release moisture and contaminants
from drier into system.
WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal injury,
death and/or equipment damage.
This system uses R-410A refrigerant, which has higher
pressures than R-22 and other refrigerants. No other refrig-
erant may be used in this system. Gage set, hoses, and re-
covery system must be designed to handle R-410A refriger-
ant. If unsure about equipment, consult the equipment man-
ufacturer.
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in damage to com-
ponents.
The compressor is in a R-410A refrigerant system and uses
a polyolester (POE) oil. This oil is extremely hygroscopic,
meaning it absorbs water readily. POE oils can absorb
15 times as much water as other oils designed for HCFC
and CFC refrigerants. Avoid exposure of the oil to the at-
mosphere.
