46
Outdoor fan control for Humidi-MiZer system units
includes a Motormaster® variable-speed control of some or all
outdoor fans, depending on unit model size. The Motormaster
control automatically adjusts the outdoor fan speed to maintain
approximately 80 to 100 F condenser temperature for circuit A
at all outdoor ambient temperatures. Some model sizes have
additional on/off staging of some outdoor fans. This staging is
controlled by both outdoor temperature and condenser coil
temperature.
Compressor staging control for Humid-MiZer units requires
that circuit A always operate when circuit B is on. This applies
to normal operation, service test, and for control alarm respons-
es. This operation difference is required due to the fact that the
Motormaster outdoor fan control senses circuit A only.
SETTING UP THE SYSTEM — The system requires instal-
lation and configuration of either a space relative humidity
sensor or a relative humidity switch input.
COMP
COND COIL
HUMIDI-MIZER COIL
EVAP COIL
INDOOR ENTERING
AIR
OUTDOOR AIR
METERING
DEVICE
CLOSED VALVE
OPEN VALVE
3-WAY VALVE
RH1.x
RH2.x
COMP
COND COIL
HUMIDI-MIZER COIL
EVAP COIL
INDOOR ENTERING
AIR
OUTDOOR AIR
METERING
DEVICE
CLOSED VALVE
OPEN VALVE
3-WAY VALVE
RH1.x
RH2.x
Fig. 6 — Normal Cooling Mode — Humidi-MiZer™ System
Fig. 7 — Subcooling Mode (Reheat1) — Humidi-MiZer System
a48-8222
a48-8223
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