16
Table 11 – Defrost Cycle
OUTSIDE TEMPERATURE
STANDARD DEFROST (AS SHIPPED)
EXTENDED DEFROST
(JUMPER JU1---F REMOVED)
Above 23°F / --- 5 °C No Defrost No Defrost
23°Fto5°F / --- 5 °C t o --- 1 5 °C 6 Minute Defrost/32 Minute Exchange 10 Minute Def rost/30 Minute Exchange
4°F t o --- 1 7 °F / --- 1 6 °C t o --- 2 7 °C 6 Minute Defrost/32 Minute Exchange 10 Minute Defrost/20 Minute Exchange
B e l o w --- 1 8 °F / --- 2 8 °C 6 Minute Defrost/20 Minute Exchange 10 Minute Defrost/15 Minute Exchange
Table 1 2 – JU1 Jumper Definition
JU1A JU1B JU1C JU1D JU1E JU1F JU1G
UNIT IDENTIFICATION
Reverse Damper O peration
In=Normal
OUt=Inverse
Factory Set
Always In
Factory Set
Always In
Table 13 – Jumper Locations
MODEL
JUMPER TABLE
JU1A JU1B JU1C JU1D JU1E JU1F JU1G
HRVCCLHA1150 OUT OUT OUT OUT IN IN IN
HRVCCLHA1250 OUT OUT OUT OUT IN IN IN
HRVCCSVU1150 OUT OUT OUT OUT IN IN IN
HRVCCSVU1250 OUT OUT OUT OUT IN IN IN
HRVCCLVU1150 OUT OUT OUT OUT IN IN IN
HRVCCLVU1200 OUT OUT OUT OUT IN IN IN
HRVCCLVU1330 OUT OUT OUT OUT IN IN IN
If defrost is not working properly, check for proper damper
operation. To do this, turn unit to OFF position. Damper should
close.
Safety Feature
This new control has an added safety feature. If microprocessor
does not detect the thermistor or detects a short circuit, unit will
automatically go into a 6 minute defrost cycle every 20 minutes.
Defrost Check
1. Make sure defrost cable is properly connected into J4.
2. Make sure thermistor assembly is correct. Measure thermistor
temperature reading with multimeter. Select multimeter DC
measurement scale 0-- 20v. At connector J4 (without removing
thermistor cable), measure voltage between pins of thermistor
cable. Depending on temperature of outside air intake, values
should correspond with those in Table 9.
3. If reading is not correct (reading 0v for short circuit or 5v for
open circuit), change thermistor assembly.
Advanced Debugging
Defrost can be simulated using the following procedures:
1. Unplug unit from 115VAC.
2. Disconnect thermistor assembly from J4.
3. Replug unit in 115VAC and select high-- speed exchange.
4. Defrost should start within 2 minutes after high --speed ex-
change has been initiated.
5. After test unplug unit.
6. Connect thermistor cable to J4.
7. Replug unit back in 115VAC.
Control Module Jumpers
Jumpers on the control module give exact configuration to HRV
micro-- controller. If there is a mistake in the jumper configuration,
it can cause improper unit operation. This control has a simplified
jumper selection mode. Jumper selection is done by the presence or
absence of jumper at specific location (see Tables 12 and 13).
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Always disconnect unit from 115VAC prior to making any
jumper change. If unit is not disconnected, micro--controller
will never see jumper change.
!
WARNING
Error Signaling
Two types of error can be signaled by the wall control (automatic
wall control only). In case of error, indicators on wall control will
flash.
When error occurs, set dehumidistat at 80% position. This will
enable you to properly troubleshoot problems.
Type 1—Loss of Memory (Auto Model Only)
All indicators flash rapidly (rate of about once very sec). When this
occurs, reset power and check if problem still exists. If indicators
are still flashing, check red wire for shorting on another
component. If error still exists, wall control has lost its memory.
Replace wall control.
The defective wall control still works even when flashing, it is
working in backup mode. Original modes of wall control are
replaced by backup mode (see Table 14).
Table 14 – Backup Mode
MODES
WALL CONTROL
BACK UP MODE
OFF OFF
1 INTERMITTENT
2 LOW--- SPEED EXCHANGE
3 HIGH--- SPEED EXCHANGE
Type 2—Communication Problem or Unsupported
Mode (Auto Model
Only)
All indicators flashing at a rate of about once every 8 sec.
Communication is not properly entered or is not working.
HRV
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