139
6. Thoroughly apply Totaline environmentally balanced coil
cleaner solution to all coil surfaces including finned area,
tube sheets and coil headers.
7. Hold garden sprayer nozzle close to finned areas and apply
cleaner with a vertical, up-and-down motion. Avoid spraying
in horizontal pattern to minimize potential for fin damage.
8. Ensure cleaner thoroughly penetrates deep into finned areas.
9. Interior and exterior finned areas must be thoroughly
cleaned.
10. Finned surfaces should remain wet with cleaning solution
for 10 minutes.
11. Ensure surfaces are not allowed to dry before rinsing. Reap-
plying cleaner as needed to ensure 10-minute saturation is
achieved.
12. Thoroughly rinse all surfaces with low velocity clean water
using downward rinsing motion of water spray nozzle. Pro-
tect fins from damage from the spray nozzle.
MICROCHANNEL HEAT EXCHANGER (MCHX) CON-
DENSER COIL MAINTENANCE AND CLEANING REC-
OMMENDATIONS
Routine cleaning of coil surfaces is essential to maintain proper
operation of the unit. Elimination of contamination and remov-
al 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 coil
face or trapped within the mounting frame and brackets.
2. Put on personal protective equipment including safety glass-
es 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 in-
dustrial 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.
CONDENSATE DRAIN
Check and clean each year at start of cooling season. In winter,
keep drains and traps dry.
FILTERS
Clean or replace at start of each heating and cooling season, or
more often if operating conditions require. Refer to Installation
Instructions for type and size.
NOTE: The unit requires industrial grade throwaway filters capa-
ble of withstanding face velocities up to 625 fpm.
OUTDOOR-AIR INLET SCREENS
Clean screens with steam or hot water and a mild detergent. Do
not use disposable filters in place of screens.
Lubrication
FAN SHAFT BEARINGS
Lubricate bearings at least every 6 months with suitable bear-
ing grease. Do not over grease. Typical lubricants are:
*Preferred lubricant because it contains rust and oxidation inhibitors.
CONDENSER AND EVAPORATOR-FAN MOTOR BEAR-
INGS
The condenser and evaporator-fan motors have permanently
sealed bearings, so no field lubrication is necessary.
Evaporator Fan Performance Adjustment
Fan motor pulleys (Fig. 45) are designed for speed shown in
Physical Data table in unit Installation Instructions (factory
speed setting).
To change fan speeds, change pulleys.
To align fan and motor pulleys:
1. Shut off unit power supply.
2. Loosen fan shaft pulley bushing.
3. Slide fan pulley along fan shaft.
4. Make angular alignment by loosening motor from mounting
plate.
5. Retighten pulley.
6. Return power to the unit.
CAUTION
Do not apply any chemical cleaners to MCHX condenser
coils. These cleaners can accelerate corrosion and damage
the coil.
CAUTION
Excessive water pressure will fracture the braze between air
centers and refrigerant tubes.
MANUFACTURER
LUBRICANT
Texaco
Regal AFB-2*
Mobil
Mobilplex EP No. 1
Sunoco
Prestige 42
Texaco
Multifak 2
IMPORTANT: Check to ensure that the unit drive matches
the duct static pressure using Tables 3-26.
Fig. 45 — Evaporator-Fan Alignment
and Adjustment
Summary of Contents for WEATHERMAKER 48A2020
Page 112: ...112 Fig 20 Typical Main Control Box Wiring Schematic 48 50A Units ...
Page 113: ...113 Fig 21 Typical Auxiliary Control Box Wiring Schematic ...
Page 114: ...114 Fig 22 Typical 2 Stage Gas Heat Wiring Schematic Size 060 Units Shown ...
Page 115: ...115 Fig 23 Typical Staged Gas Heat Wiring Schematic Size 060 Units Shown TO NEXT PAGE ...
Page 116: ...116 Fig 23 Typical Staged Gas Heat Wiring Schematic Size 060 Units Shown cont ...
Page 117: ...117 Fig 24 Typical Electric Heat Control Schematic 50 Series Size 060 Units Shown ...
Page 118: ...118 Fig 25 Typical Controls Option Wiring Schematic SW1 SW2 OR DEHUMIDIFY SWITCH ...
Page 119: ...119 Fig 26 Typical Power Schematic 48 50A2 A3 A4 A5 060 Unit Shown ...
Page 120: ...120 Fig 27 Typical Power Schematic of Greenspeed Low Ambient Option 48 50A 060 Unit Shown ...
Page 121: ...121 Fig 28 Typical Small Chassis Component Location Size 020 035 Units ...
Page 122: ...122 Fig 29 Typical Large Chassis Component Locations Size 040 060 Units ...
Page 185: ...185 APPENDIX C VFD INFORMATION cont Fig F Internal Enclosure Fan Replacement A48 7716 ...