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Fig. 53 — Condenser-Fan Adjustment
(All Units Except Size 035)
CONDENSER FAN ADJUSTMENT (SIZE 035)
Each fan is supported by a formed wire mount bolted to a fan deck
and covered with a wire guard. The exposed end of the fan motor
shaft is protected from weather by grease. If the fan motor must be
removed for service or replacement, be sure to regrease fan shaft
and reinstall fan cover, retaining clips, and fan guard. For proper
performance, the fans should be positioned as shown in Fig. 54.
Tighten setscrews to 14 1 ft-lb (18 1.3 N-m).
Check for proper rotation of the fan(s) once reinstalled (counter-
clockwise viewed from above). If necessary to reverse, switch
leads at contactor(s) in control box.
FAN ORIFICE
Fig. 54 — Condenser Fan Position (Size 035 Units)
AIR PRESSURE TRANSDUCER FIELD ADJUSTMENT
All transducers have been factory calibrated and should not re-
quire field adjustment. If field adjustment is necessary, follow the
instructions below. To re-calibrate a transducer:
1.
Shut the unit power off.
2.
Take the wiring and pressure tubing off the transducer.
Take the transducer out of the unit.
3.
Connect a 24 vdc power supply to transducer terminals
EXC(+) and COM(–). See Fig. 55.
4.
Using a digital multimeter measure the current between
terminals EXC(+) and OUT.
5.
With both pressure ports open to atmosphere, adjust the
Zero (Z) screw potentiometer on the transducer and read
the multimeter until the desired current output at 0 in. wg
pressure is obtained (see Fig. 55).
6.
Reinstall the transducer in the unit.
7.
Restore power to the unit.
PLASTIC FAN
PROPELLER
CLEARANCE OF 0.25 INCHES
(6.4 MM) FOR STANDARD
CONDENSER FANS
FAN DECK
SURFACE
162
TRANSDUCER
INPUT
PART
RANGE
NUMBER
(in. wg)
HK05ZG019
0 to 5
HK05ZG020
0 to 1
HK05ZG019
0 to 5
HK05ZG022
–0.25 to 0.25
Fig. 55 — Transducer Details
Cleaning
Inspect unit at the beginning of each heating and cooling season
and during each season as operating conditions may require.
MICROCHANNEL
HEAT
CONDENSER COIL MAINTENANCE AND CLEANING
RECOMMENDATIONS
CAUTION
UNIT DAMAGE HAZARD
Do not apply any chemical cleaners to MCHX condenser
coils. These cleaners can accelerate corrosion and damage the
coil.
Routine cleaning of coil surfaces is essential to maintain proper
operation of the unit. Elimination of contamination and removal of
harmful residues will greatly increase the life of the coil and ex-
tend the life of the unit. The following steps should be taken to
clean MCHX condenser coils:
1.
Remove any foreign objects or debris attached to the coil
face or trapped within the mounting frame and brackets.
2.
Put on personal protective equipment including safety
glasses and/or face shield, waterproof clothing and gloves.
It is recommended to use full coverage clothing.
3.
Start high pressure water sprayer and purge any soap or
industrial cleaners from sprayer before cleaning condenser
coils. Only clean potable water is authorized for cleaning
condenser coils.
4.
Clean condenser face by spraying the coil steady and uni-
formly from top to bottom while directing the spray
straight toward the coil. Do not exceed 900 psig or
30 degree angle. The nozzle must be at least 12 in. from
the coil face. Reduce pressure and use caution to prevent
damage to air centers.
OUTPUT
OUTPUT
USAGE
RANGE
AT 0 IN. WG
Supply Duct/
4 to 20 mA
4 mA
Air Foil
Fan cfm
Forward
4 to 20 mA
4 mA
Curved
Fan cfm
Return/
4 to 20 mA
4 mA
Exhaust
Fan cfm
Building
4 to 20 mA
12 mA
Pressure
HIGH
LOW
COM
OUT
EXC
EXCHANGER
(MCHX)
S
Z
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