HUMIDI-MIZER™ ADAPTIVE DEHUMIDIFICATION SYSTEM
Maintaining indoor space humidity
levels can be increasingly difficult
depending on the time of year,
location of the installation, and the
ability of the equipment to provide
reliable, flexible operation to meet
indoor part load sensible and latent
load requirements. Standard rooftop
performance often cannot meet
these variable requirements, as the
unit’s sensible heat ratio is typically
fixed and the unit is generally
controlled from sensible loads only
via a thermostat.
Carrier’s Humidi-MiZer Adaptive
Dehumidification system is an allinclusive factory installed option,
available on Carrier’s 2-25 ton
unitary rooftop units. It meets the
demand for a cost effective, yet
flexible and high performing solution
to these humidity and part-load
issues.
HUMIDI-MIZER™ ADAPTIVE DEHUMIDIFICATION SYSTEM
How it works: Using a simple space thermostat and humidistat input, the Humidi-MiZer Adaptive Dehumidification system
changes the refrigerant flow by adjusting the position of the refrigerant solenoid valves. There are three modes of operation:
Normal, Sub-Cooling and Hot Gas ReHeat. For units with two refrigerant circuits, each circuit can operate in each of the
three modes independently, giving the unit the ultimate flexibility to satisfy space temperature and humidity loads.
✦Normal
Mode: Refrigerant flows from the outdoor condenser through the normal open Cooling Valve (CV.x) to the
expansion device. Reheat1 Valve (RH1.x) and Reheat2 Valve (RH2.x) are closed.
✦Sub-Cooling
Mode (Reheat 1): This mode increases latent cooling and decreases sensible cooling compared to
normal cooling. Refrigerant flows from the outdoor condenser, through the normally open Reheat1 Valve (RH1.x),
Controls (cont)
and through the reheat condenser coil to the expansion device. Cooling Valve (CV.x) and Reheat2 Valve (RH2.x) are
Reheat 2 (Hot Gas Reheat Mode) — 48PG03-16 —
48PG03-16
closed.
This mode provides maximum latent cooling with little to
Normal Cooling — Refrigerant flows from the outdoor
no sensible capacity. This mode can operate to provide decondenser through the normally open Cooling Valve
humidification when there is no cooling demand. Like
(CV.x) toMode
the expansion
device.
Valve (RH1.x)
and maximum
Gas ReHeat
(Reheat
2):Reheat1
This mode
provides
latent cooling with little to no sensible capacity.
Reheat1 mode, refrigerant flows from the outdoor conReheat2 Valve (RH2.x) are closed.
denser,
through
the normally
open Reheat1
Valve (RH1.x),
This mode can
operate
to
provide
dehumidification
when
there
is
no
cooling
demand.
Like Reheat1
mode,
Reheat 1 (Subcooling Mode) — 48PG03-16 — This
and through the reheat condenser coil to the expansion demodefrom
increases
latent
cooling
and decreasesthrough
sensible coolrefrigerant flows
the
outdoor
condenser,
the
normally
Reheat1
Valve
(RH1.x),
and
through the
vice. Theopen
Cooling
Valve (CV.x)
is closed.
Reheat2
Valve
ing compared to normal cooling. Refrigerant flows from
(RH2.x) is open which provides some compressor disthe
outdoor
condenser,
through
the
normally
open
reheat condenser coil to the expansion device. The Cooling charge
Valvegas
(CV.x)
closed.
Reheat2
Valve
(RH2.x)
is open
to theisreheat
condenser
to further
increase
the
Reheat1 Valve (RH1.x), and through the reheat condenser
reheat of the evaporator airstream.
coilsome
to the compressor
expansion device.
Cooling Valve
andreheat condenser to further increase the reheat of the
which provides
discharge
gas(CV.x)
to the
Reheat2 Valve (RH2.x) are closed.
✦Hot
evaporator airstream.
NORMAL COOLING MODE — HUMIDI-MIZER SYSTEM (48PG03-16)
RH2.x
RH1.x
COND COIL
COMP
HUMIDI-MIZER COIL
CV.x
OUTDOOR AIR
METERING
DEVICE
EVAP COIL
CLOSED VALVE
OPEN VALVE
INDOOR ENTERING
AIR
Cost Effective: Available as a factory installed option on 2 to 25
ton unitiary rooftop products, the Humidi-MiZer Adaptive
Dehumidification system provides a cost effective packaged
alternative for meeting latent load intensive applications and
variable SHR requirements. System installation costs are
simplified and minimized by using Carrier’s Thermidistat™ or a
humidistat device with the thermostat for combined temperature
and humidity sensing in the space.
a48-8172
Factory Installed & Warranted: The Humidi-MiZer Adaptive
Dehumidification system is a factory designed, tested and
installed option, specifically engineered for optimum
performance and reliability with Carrier rooftop units. The
Humidi-MiZer is backed by the rooftop unit’s factory warranty.
160
Temperature Equipment Corporation
17725 Volbrecht Road Lansing, IL 60438
T/708-418-0900 F/708-418-5100