158
Cleaning — Inspect unit at the beginning of each heating
and cooling season and during each season as operating condi-
tions may require.
MICROCHANNEL HEAT EXCHANGER (MCHX) CON-
DENSER COIL MAINTENANCE AND CLEANING
RECOMMENDATIONS
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 extend 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 core
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.
Fig. 54 — Pulley Alignment
Fig. 55 — Condenser-Fan Adjustment
(Metal Fan)
CAUTION
Do not apply any chemical cleaners to MCHX condenser
coils. These cleaners can accelerate corrosion and damage
the coil.
PLASTIC FAN
PROPELLER
CLEARANCE OF 0.25 INCHES
(6.4 MM) FOR STANDARD
CONDENSER FANS
FAN DECK
SURFACE
FAN ORIFICE
Fig. 56 — Condenser Fan Position (Plastic Fan)
Fig. 57 — Transducer Details
TRANSDUCER
PART
NUMBER
INPUT
RANGE
(in. wg)
OUTPUT
RANGE
OUTPUT
AT 0 IN. WG
USAGE
HK05ZG019 0-5 4-20 mA 4 mA
Air Foil
Fan Cfm
HK05ZG020 0-1 4-20 mA 4 mA
Return
Fan Cfm
HK05ZG022 –0.25-0.25 4-20 mA 12 mA
Building
Pressure
PRESSURE PORTS
LOW
HIGH
S
Z
COM OUT EXC
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