Installation guide

ManualsBrandsTappan ManualsDomestic AppliancesJT4BE, Single Phase

the thermostat inputs to the unit. Thus, when the

switch opens and then closes, there will be a 5

minute short cycling delay before the outdoor

unit will energize.

High-Pressure Switch — A high-pressure

switch is factory-installed and located in the

compressor discharge line internal to the outdoor

unit. The switch is designed to de-energize the

system when very high pressures occur during

abnormal conditions. Under normal conditions,

the switch is closed. If the discharge pressure

rises above 575 psig, then the switch will open

and de-energize the outdoor unit. The switch

will close again once the discharge pressure

decreases to 460 psig. Please note that the switch

interrupts the thermostat inputs to the unit. Thus,

when the switch opens and then closes, there

will be a 5 minute short cycling delay before the

outdoor unit will energize.

Short Cycle Protection — With the system

operating in COOLING mode, note the setpoint

temperature setting of the thermostat, and

gradually raise the setpoint temperature until

the outdoor unit and indoor blower de-energize.

Immediately lower the setpoint temperature of

the thermostat to its original setting and verify

that the indoor blower is energized and that the

outdoor unit remains de-energized. Verify that,

after approximately 5 minutes, the outdoor unit

energizes and that the temperature of the air

supplied to the facility is cooler than ambient

temperature.

Comfort Alert

Diagnostics (Select Models)

— The Comfort Alert

diagnostics module

facilitates troubleshooting heat pump and air

conditioning system failures. This Comfort

Alert

module is designed only for single-phase

systems with scroll compressors that have

internal overload protection. By monitoring and

analyzing data from the compressor and the

thermostat demand, the module can detect the

cause of electrical and system related failures

without any sensors. A ﬂashing LED indicator

communicates the ALERT code and guides the

service technician more quickly and accurately

to the root cause of a problem.

NOTE: This module does not provide safety

protection! The Comfort Alert

module is a

monitoring device and cannot control or shut

down other devices.

LED Description (See Figure 2)

POWER LED (Green): indicates voltage is present

at the power connection of the module.

ALERT LED (Yellow): communicates an

abnormal system condition through a unique

ﬂash code. The ALERT LED will ﬂash a number

of times consecutively, pause and then repeat

the process. The number of consecutive

ﬂashes, deﬁned as the Flash Code, correlates

to a particular abnormal condition. Detailed

descriptions of speciﬁc ALERT Flash Codes are

shown in Table 1 of this manual.

TRIP LED (Red): indicates there is a demand

signal from the thermostat but no current to the

compressor is detected by the module. The TRIP

LED typically indicates the compressor protector

is open or may indicate missing supply power

to the compressor.

The scroll compressor’s run (R), common (C)

and start (S) wires are routed through the holes

in the Comfort Alert

module marked “R,” “C”

and “S.”

24 VAC Power Wiring — The Comfort Alert

module requires a constant nominal 24 VAC

power supply. The wiring to the module’s R and

C terminals must be directly from the indoor unit

or thermostat.

The Comfort Alert

module requires a thermostat

demand signal to operate properly.

NOTE: After the thermostat demand signal is

connected, verify that 24 VAC across Y and C

when demand is present.

TROUBLESHOOTING

Interpreting The Diagnostic LEDs – When

an abnormal system condition occurs, the

Comfort Alert

module displays the appropriate

ALERT and/or TRIP LED will ﬂash a number of

times consecutively, pause and then repeat the

process. To identify a Flash Code number, count

the number of consecutive ﬂashes.

Every time the module powers up, the last

ALERT Flash Code that occurred prior to shut

down is displayed for one minute. The module

will continue to display the LED until the condition

returns to normal or if 24 VAC power is removed

from the module.

Cooling — Gradually lower the thermostat

temperature setpoint below the actual room

temperature and observe that the outdoor unit

and indoor blower energize. Feel the air being

circulated by the indoor blower and verify that it is

cooler than ambient temperature. Listen for any

unusual noises. If present, locate and determine

the source of the noise and correct as necessary.