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TW Series Water to Water
evaporator coil as shown in Figure #5. If
temperature drops below or remains at the
limit trip for 30 seconds, the controller will shut the
compressor down and enter into a soft lockout
condition. Both the status LED and the Alarm
contact will be active. The LED will flash (six (6)
times) the code associated with this alarm
condition. If this alarm occurs 2 times (or 4 if Dip
switch is set to 4) within an hour the controller will
enter into a hard lockout condition.
NOTICE: Freeze sensor will not guard
against the loss of water. Flow switch is
recommended to prevent unit from running
if water flow is lost or reduced.
•
INTELLIGENT RESET: If a fault condition is initiated,
the 5 minute delay on break time period is initiated
and the unit will restart after these delays expire.
During this period the fault LED will indicate the
cause of the fault. If the fault condition still exists or
occurs 2 or 4 times (depending on 2 or 4 setting for
Lockout dip switch) before 60 minutes, the unit will
go into a hard lockout and requires a manual lockout
reset.
•
LOCKOUT RESET: A hard lockout can be reset by
turning the unit thermostat off and then back on
when the "RESET" dip switch is set to "Y" or by
shutting off unit power at the circuit breaker when
the "RESET" dip switch is set to "R".
OPTIONS
Number of factory installed options are available on TW
Series of Heat Pumps. The following details the purpose,
function and components of each option.
Heat Recovery Package (HRP)
The heat recovery package is a factory installed option
on TW series heat pumps. The HRP can be used to heat
potable water during unit operation using waste heat
from the compressor discharge gas. In some cases the
HRP can provide most or all of the hot water
requirements for a typical home.
The HRP consists of three major components:
•
Double wall, vented refrigerant to water heat
exchanger
•
Circulating pump
•
Control circuit
The heat exchanger is rated for use with potable water
and is acceptable for use as a domestic water heating
device in most building codes.
The pump circulates water between the domestic hot
water tank and HRP heat exchanger in the Heat Pump.
The control circuit ensures that the HRP only operates
when there is available heat from the compressor and
when the water is within a safe temperature range of
below 140 deg F.
Revised 02-16
When the heat pump compressor operates, the HRP will
monitor the temperature of the discharge gas from the
f
reeze
compressor. Once discharge gas is hot enough to
provide useful heat to the domestic water tank, the
circulating pump will be enabled, drawing water from
the tank, through the HRP heat exchanger and then
depositing the heated water back into the tank. If the
water temperature reaches 140 deg F, the circulating
pump is disabled to prevent over heating of the
domestic water. The HRP is provided with an on/off
switch in case the end user desires that the HRP be
inactivated (typically during the winter months when
space heating is most important).
NOTICE: If heat recovery unit is installed in
an area where freezing may occur, the unit
must be drained during winter months to
prevent heat exchanger damage. Heat
exchanger ruptures that occur due to
freezing will void the heat recovery package
warranty along with the heat pump
warranty.
DPS Water Flow Proving
The DPS water flow proving switch is a factory installed
option available for the WW series. The DPS prevents
compressor operation if there is inadequate water flow
through the water to refrigerant heat exchanger in the
heat pump.
The DPS operates by monitoring the water side pressure
drop across the water to refrigerant heat exchanger.
When the pressure drop between the water in and water
out lines reaches a pre-set value, compressor operation
is enabled.
Pump Relay
The factory installed pump relay can be used to energize
a supply pump or solenoid valve when there is a call for
compressor operation. This relay can be used to switch
either high or low voltage power.
Comfort Alert Module
The Comfort Alert diagnostics module (CADM) is a
breakthrough innovation for troubleshooting heat pump
system failures. (Figure #6)
Options | 9
Figure # 6
6720220047 (2016/02)
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Table of Contents
Troubleshooting
