Instruction manual

CLIMATEMASTER WATER-SOURCE HEAT PUMPS
D (ERV) Series
Rev.: 04 April, 2014
4
ClimateMaster Water-Source Heat Pumps
16. Replace access panel onto the ERV unit and secure.
17. Restore power to unit.
18. Cleanup once unit is operating properly, caulk
any open joints, holes or seams to make the units
completely air and water tight.
19. Leave this instruction manual with owner or in an
envelope to be kept near unit.
Operation
(How It Works)
The unit contains an Energy Recovery Wheel (ERW)
that is a new concept in rotary air-to-air heat exchangers.
Designed as a packaged unit for ease of installation and
maintenance, only the connection of electrical power is
required to make the system operational.
When slowly rotating through counter fl owing exhaust
and fresh air streams the ERW adsorbs sensible heat
and latent heat from the warmer air stream and transfer
this total energy to the cooler air stream during the
second half of its rotating cycle. Rotating at 50-60
revolutions per minute, the wheel provides constant fl ow
of energy from warmer to cooler air stream. The large
energy transfer surface and laminar fl ow through the
wheel causes this constant fl ow of recovered energy
to represent up to 85% of the difference in total energy
contained within the two air streams.
Sensible and latent heat are the two components of total
heat. Sensible heat is energy contained in dry air and
latent heat is the energy contained within the moisture
of the air. The latent heat load from the outdoor fresh air
on an air conditioning system can often be two to three
times that of the sensible heat load and in the winter it is
a signifi cant part of a humidifi cation heat load.
During both the summer and winter, the ERW transfers
moisture entirely in the vapor phase. This eliminates wet
surfaces that retain dust and promote fungal growth as
well as the need for a condensate pan and drain to carry
water.
Because it is constantly rotating when in the air stream,
the ERV is always being cleaned by air, fi rst in one
direction then the other. Because it is always dry, dust or
other particles impinging on the surface during one half
cycle, are readily removed during the next half cycle.
During the heating season, when outdoor air
temperatures are below 15ºF, it is recommended to use
the (optional) low ambient kit (fi eld installed).
Optional Kit (Factory Installed)
Motorized Intake Air Damper
Damper mounts behind the outdoor air intake hood. It
opens when the ERV is energized and closes when
de-energized. Powered by B30 damper motor.
Pressure Sensor
Measurement device on the ERV to determine airfl ow
across the Enthalpy Wheel.
Low Ambient Control Kit
Prevents frost formation on energy wheel heat transfer
surfaces by terminating the intake blower operation when
discharge air temperature falls below a fi eld selectable
temperature setting. Intake blower operation resumes
operation after temperature rises above the adjustable
temperature differential.
The frost threshold is the outdoor temperature at which
frost will begin to form on the ERV wheel. For Energy
Recovery Ventilators, the frost threshold is typically below
10ºF. Frost threshold is dependent on indoor temperature
and humidify. The table shows how the frost threshold
temperatures vary depending on indoor conditions.
Because Energy Recovery Ventilators have a low frost
threshold, frost control options are not necessary in many
climates. Where outdoor temperatures may drop below
the frost threshold during the ERV operational hours,
exhaust only frost control option is available.
Low Ambient Kit is appropriate for climates with limited
HVAC system operation when outdoor temperatures are
below 10ºF.
Stop-Start-Jog
Control option that allows intermittent operation of the
enthalpy wheel during mild outdoor conditions to provide
cycling and cleaning of the wheel.
Motorized Exhaust Damper
Damper mounts inside the exhaust air hood. It opens
when the ERV is energized and closes when
de-energized. Powered by B31 damper motor.
FROST THRESHOLD TEMPERATURE
INDOOR RH AT 70ºF
FROST THRESHOLD
TEMPERATURE
20% 0ºF
30% 5ºF
40% 10ºF