Unit installation

NOTE: The unit is considered balanced even if there is a
difference of -+10 CFM (or -+5 1/s or 17 m3/h) between the two air
flows.
Balancing Dampers
Balancing dampers (sometimes called butterfly dampers) are
located in fresh-air intake and stale-air exhaust of the ERV. (See
Fig. 11.) Some field modification may be required to ensure proper
adjustment of balancing dampers while located in flexible duct.
Insulating over these dampers is strongly recomnmnded after
balancing is complete to prevent condensation problems.
NOTE: Temporary flow collars are not needed with the new
ERVCCLHA models since the air flow pressure taps are
incorporated in the access door. (See Fig. 11.)
VENTILATION EVALUATION
[ UNIT DAMAGE HAZARD
Failure to follow this caution may result in reduced unit
efficiency, capacity or unit life.
DO NOT use ERV during construction of a house or when
sanding drywall. This type of dust may damage system.
Ventilator Sizing
Tables 3 and 4 should be used to determine the required airflow fnr
a home. These guidelines are taken from ASHRAE 62.2-2004.
Table 3 - Ventilation Air Requirements, cfm
FLOOR BEDROOMS
AREA(if2) 0-1 2-3 4-5 6-7 >7
<1500 30 45 60 75 90
1501-3000 45 60 75 90 105
3001-4500 60 75 90 105 120
4501-6000 75 90 105 120 135
6001-7500 90 105 120 135 150
>7500 105 120 135 150 165
Table 4 - Ventilation Air Requirements, L/s
FLOOR BEDROOMS
AREA
(m2) 0-1 2-3 4-5 6-7 >7
<139 14 21 28 35 42
139.1-279 21 28 35 42 50
279.1-416 28 35 42 50 57
416.1-557 35 42 50 57 64
557.1-697 42 50 57 64 71
>697 50 57 64 71 78
Freshair flow
ExhaustAirFI0w
Fig. 11 - Balancing ERVCCLHA
A05264
CONTROL BOARD OPERATION
Board Function
To ensure proper operation of ERV. configuration jumpers are
located on electronic control board and must match configuration
setup shown in Fig. 12 under Jumper Table. Jumpers are factory set
and do not require any changes unless control board is replaced. If
control board is replaced, or unusual start-up operation is
encountered, check jumpers to make sure they are located properly.
NOTE: Power disconnect for 30 seconds is required to reset the
CPU when changing jumpers.
Outdoor Ambient Below 23 ° F (-5 ° C)
The ERV continually monitors outside air temperature. If outside
air is at or below 23 ° F (-5 ° C), ERV will cycle between air
exchange and defrost.
The ERV measure the incoming air temperature and will cycle unit
in and out of defrost, depending on outdoor ambient. The intake
damper will close and circulate indoor air through the core for 6 to
10 minutes. This time depends on jumper location. Refer to Table 5
for defrost cycle.
Table 5 - Defrost Cycle
ERV DEFROST CYCLES
Extended Defrost
Outside Standard
Temp °F / °C Defrost (as shipped) (Jumper JU1 -F
Removed)
Above 23°F / No Defrost No Defrost
_5oc
23 to 5°F / 10 Minute Defrost/60 10 Minute Defrost/30
-5 to -15°C Minute Exchange Minute Exchange
4 to - 17°F / 10 Minute Defrost/30 10 Minute Defrost/20
- 16 to -27°C Minute Exchange Minute Exchange
Below -18°F/ 10 Minute Defrost/20 10 Minute Defrost/15
-28°C Minute Exchange Minute Exchange
OFF and INTERMITTENT/OFF Mode
When ERV is Off, K1 relay is open (see Fig. 12).
High-Speed Air Exchange
When high-speed air exchange occurs. K1 relay closes and K2 (12
VDC relay) is energized. This opens low-speed contacts, and
closes high-speed contacts. Then. 115 VAC is applied between
orange and gray wires on Molex( R;plug (pins 1 and 6) and blower
motor runs in high-speed operation. Also, 115 VAC is applied
across pins 5 and 7, this energizes interlock relay (see Fig. 12).
Low-Speed Air Exchange
When low-speed air exchange occurs, K1 relay closes and K2 (12
VDC relay) is de-energized. This keeps low-speed contacts closed