Check Charge - Bryant 598B Installation And Start-Up Instructions Manual

ACCESSORY
Wind Baffle
Coastal Filter
Support Feet
†Liquid-Line Solenoid Valve
* For tubing line sets between 50 and 175 ft, refer to Application Guideline and Service Manual for Residential Split System Air Conditioners and Heat Pumps using Puron®
Refrigerant. Crankcase heater and start assist are standard on two-speed units.
†All two-speed units require hard shut-off TXV.
M, N, P, or R and humidity rises, the humidistat contacts open and
de-energize the relay. If relay is de-energized, the system operates
on high-speed compressor and low-speed airflow until humidistat
closes. Fig. 9L and 9Q shows the wiring with a Bryant Thermi-
distat which controls temperature and humidity level without the
need for an additional humidistat and relay.
IX. MAKE AIRFLOW SELECTIONS
A. AIRFLOW SELECTION FOR 333AAV FURNACES
The 333AAV Non-Condensing Variable-Speed Furnaces provide
high- and low-speed blower operation to match the capacities of
compressor high and low speeds. To select recommended airflow,
refer to Table 4 and the 333AAV Installation Instructions. These
settings are made on the furnace airflow selector board by moving
the appropriate color-coded jumper wires. The ORANGE jumper
wire should be set to the AC position for cooling only. The
YELLOW COOL SIZE jumper is used to select airflow to match
the needed tons of cooling. The BLUE CFM/TON jumper wire is
used to select slight adjustments to airflow of 400, 350, or 315
CFM per ton. (See Table 4.)
B. AIRFLOW SELECTION FOR 355MAV FURNACES
The 355MAV Condensing Variable-Speed Furnaces provide high-
and low-speed blower operation to match the capacities of com-
pressor at high and low speeds. To select recommended airflow,
refer to Table 5 and the 355MAV Installation Instructions. The
355MAV utilizes a control center that allows the installing
technician to select proper airflows. For adjustments to the manual
switches labeled A/C and CF and recommended switch positions,
refer to Table 5. High-speed airflow is determined by the position
of the A/C switches, and low-speed airflow is determined by the
position of the CF switches. This furnace has a built-in, non-
adjustable 90 sec off delay for cooling mode blower operation.
C. AIRFLOW SELECTION FOR FK4C OR FV4A FAN
COILS
The FK4C and FV4A provides high- and low-speed blower
operation to match the capacities of compressor at high and low
speeds. To select recommended airflow, refer to Table 6 and the
FK4C or FV4A Installation Instructions. The FK4C and FV4A
utilize an EASY SELECT control board that allows the installing
technician to select proper airflows. For adjustments to control
board and recommended A/C SIZE and CFM ADJUST selections,
refer to Table 6. This fan coil has an adjustable blower off delay
factory set at 90 sec. for high- and low-speed blower operation.
X. START-UP
CAUTION: To prevent compressor damage or personal
injury, observe the following:
• Do not overcharge system with refrigerant.
• Do not operate unit in a vacuum or at negative pressure.
• Do not disable low-pressure switch.
TABLE 2—ACCESSORY USAGE
REQUIRED FOR
LOW-AMBIENT
APPLICATIONS
(BELOW 55°F)
See Low-Ambient Instructions
No
Recommended
No
Follow these steps to properly start up the system:
NOTE: Bryant electronic thermostats are equipped with a 15
minute staging timer. This timer prevents the two-speed system
from operating at high speed until unit has been operating in low
speed for 15 minutes unless there is at least a 5°F difference
between room temperature and thermostat set point. To force high
speed (after a minimum of 2 minutes in low speed), adjust the set
point at least 5° below room ambient.
XI. CHECK CHARGE
—6—
REQUIRED FOR
LONG-LINE
*
APPLICATIONS
(50-175 FT)
No
No
No
See Long-line
Application
Guideline
CAUTION: To prevent personal injury wear safety
glasses, protective clothing, and gloves when handling
refrigerant and observe the following:
• Back seating service valves are not equipped with
Schrader valves. Fully back seat (counter clockwise)
valve stem before removing gage port cap.
CAUTION: Do not vent refrigerant to atmosphere. Re-
cover during system repair or final unit disposal.
1. The outdoor unit is equipped with a crankcase heater which
operates when the compressor is off. Energize crankcase
heater 24 hr. before starting unit. To energize heater only,
set indoor thermostat to OFF position and close power
disconnect to unit. Starting the compressor without 24 hours
of crankcase heat may cause damage to the compressor.
2. Fully back seat (open) liquid and vapor tube service valves.
3. Unit is shipped with valve stem(s) front seated and caps
installed. Replace stem caps after system is opened to
refrigerant flow (back seated). Replace caps finger tight and
tighten additional 1/12 turn (20 ft-lb torque) with wrench.
4. Close electrical disconnects to energize system.
5. Set room thermostat at desired temperature. Be sure set
point is below indoor ambient and is set low enough to
energize desired speed.
6. Set room thermostat to COOL and fan control to AUTO or
ON as desired. Wait for appropriate time delay(s) and 2
minute minimum low-speed run time. Operate unit for 15
minutes. Check refrigerant charge.
WARNING: Service valve gage ports are not equipped
with Schrader valves. To prevent personal injury, make
sure gage manifold is connected to the valve gage ports
before moving valves off fully back seated position. Wear
safety glasses and gloves when handling refrigerant.
REQUIRED FOR
SEACOAST
APPLICATIONS
(WITHIN 2 MILES)
No
Yes
Recommended
No