iFLOW HVAC INC.
www.iflowhvac.com
21
Mistaking the wiring and not confirming both the heat pump’s
heating and cooling operation may lead to evaporator and
hydronic coil damage that will not be covered under warranty
iFLOW D. H. Evaporator Temperature Sensor:
The installer must field supply and install the optional iFLOW D.H.
Evaporator Temperature Sensor (part number 30ETS02B) and
install it on the suction line of the heat pump. iFLOW uses this D.H.
Evaporator Temperature Sensor to detect the operational state of
the reversing valve. It must be installed for the system to operate. It
is installed on the suction line, close to the evaporator (see diagram
to the right).
iFLOW expects the majority of installations will not be paired with
a heat pump, thus this sensor is not included as a standard item
unfortunately.
Type of Thermostats:
When pairing a heat pump with an iFLOW Hydronic Furnace, you
DO NOT NEED any special or proprietary heat pump thermostat.
iFLOW provides full functionality even with a basic thermostat; all
iFLOW needs is R, W, G, & Y for full performance. iFLOW does not
require staging, auxiliary, emergency or backup functionality from
the thermostat, thus multiple thermostat contacts like W2, Y2, O, B,
E, Em, Aux, etc. will not be used when connecting to the iFLOW.
CAUTION
Thermostat/iFLOW/Heat Pump Wiring:
Unfortunately it seems there is no wiring standardization within
the heat pump industry. As most heat pumps are imported to
North America, variances may occur by country of origin. Overall
operation will be similar but detailed specifics will vary and as such,
iFLOW cannot definitively assist with wiring diagrams. iFLOW will
provide guidelines as ‘suggestions’ but DO NOT assume these are
correct as they can vary by heat pump manufacturer.
When installing an iFLOW with a heat pump, Y is not considered a
call for ‘cooling’; it is considered a call for the ‘compressor on’.
The
installer must know whether the heat pump’s default mode is
heating or cooling. If unsure, simply call for ‘compressor on’
by jumping C and Y at the iFLOW PCB thermostat connection
and then observe what temperature is being delivered to the
evaporator: if hot, ‘Heating’ is the default mode; if cold, then
‘Cooling’ is the default mode.
To what terminal on the heat pump and whether that terminal
connection is marked
(O or B)
, can vary by manufacturer. As such,
the installing contractor
MUST NOT
rely solely on wiring diagrams
without also confirming proper operation. To confirm operation,
initiate a call for cooling and then feel the temperature on the heat
pump line set to the evaporator to confirm chilled refrigerant. Next,
initiate a call for heating to the heat pump. If wired correctly, heated
refrigerant should have arriving at the evaporator coil. Be sure to
confirm operation both heating and cooling to ensure no damage to
the equipment.
CAUTION
* The DH Evap Defrost Sensor must be installed on
the suction pipe to operate for H/P.
DH Evap Defrost Sensor
A / C Evap T. Sensor
