Specifications

VCES-VUV-IOM-1A – HRV450w & HRV1000w
10
In the HRV450w ventilation mode, the ventilation damper
is open and the supply air is 100% outdoor air. In the
HRV1000w ventilation mode, the ventilation damper is
open and the supply air is a mixture with a percentage of
return air (see Table B2 or Table B3).
In recirculation mode, the ventilation damper is closed,
100% of the supply air is recirculated air from the return
plenum. Units equipped with recirculation control are built
with a damper mechanism controlling airflow through the
intake duct. Ventilation mode is activated by a signal to
terminal S1. Recirculation mode is activated when there is
a signal from W2 or when there is no signal to S1.
Units with frost control are equipped with recirculation
control. Frost control consists of a timer/controller which is
activated by a thermostat which monitors the outside air
temperature passing through the air intake.
When the HRV450w and HRV1000w are in ventilation
mode at temperatures below 23°F [−5°C], the frost control
timer/controller activates recirculation control periodically
to keep the flat plate heat exchanger free from frost.
A bi-metallic disc (field installed) is provided with hydronic
units to prevent the coils from freezing up. This disc is
located near the supply fan and is to be connected to the
zone valve that controls the flow to the coil. When the
temperature in the cabinet goes below freezing, the disc
closes its contacts to engage the flow through the coil to
prevent the coil from freezing. See the wiring diagram on
unit control box cover for more details.
Air Filters
HRV450w
The washable black foam filters should be cleaned
monthly or as required by operating conditions. The op-
tional medium efficiency filters are disposable and should
be replaced monthly or as required by operating condi-
tions. To remove the filters, simply remove the top access
door and slide the filter out of the guide (see Figure 1).
When installing a new filter, the airflow arrow should
point in the direction of the heat exchanger.
HRV1000w
The standard medium efficiency filters are disposable and
should be replaced monthly or as required by operating
conditions. When installing a new filter, the airflow arrow
should point in the direction of the heat exchanger.
To remove the HRV1000w filters, simply remove the bot-
tom access door and slide the filter out of the guide.
Recirculation Control
Frost Control
Freeze Control Temperature Disc
System Service
Monthly Maintenance
WARNING
Disconnect power before maintaining the unit.
!
Figure 1: HRV450w exhaust filter