9
CONNECT CONTROL WIRING
Route low--voltage control wires through control wiring grommet
and connect leads to control board.
For 24ANA1 models, connect to Infinity connections ABCD
only. Standard non--communicating thermostats are not allowed
unless it is an emergency that User Interface is not working
properly and new User Interface is not available. For emergency
use, connect to standard thermostat connections R, C, Y1 and Y2.
Use No. 18 AWG color--coded, insulated (35
_
C minimum) wire
for all installations.
All wiring must be NEC Class 1 and must be separated from
incoming power leads.
Use furnace transformer or fan coil transformer for control power,
24--v/40--va minimum. The outdoor unit requires a minimum of
27va/24 vac control power.
FINAL WIRING CHECKS
IMPORTANT
: Check factory wiring and field wire connections
to ensure terminations are secured properly. Check wire routing
to ensure wires are not in contact with tubing, sheet metal, etc.
STEP 8
—
Compressor Crankcase Heater
Furnish power to crankcase heater a minimum of 24 hr before
starting unit. To furnish power to heater only, set thermostat to
OFF and close electrical disconnect to outdoor unit.
NOTE
: On 24ANA7 models, starting the compressor without a
minimum of 12 hours of crankcase heat prior to initial start--up
may result in a compressor chattering noise and possible damage
to the compressor.
STEP 9
—
Install Accessories
Refer to the individual instructions packaged with kits or
accessories when installing.
STEP 10
—
Make Airflow Selections
AIRFLOW SELECTION FOR 58CVA/MVB FURNACES
FOR 24ANA7 MODELS ONLY USING NON--COMMUNI-
CATING (NON--INFINITY) THERMOSTATS
The 58CVA/MVB non--condensing variable speed furnaces
provide high-- and low--stage blower operation to match the
capacities of the compressor at high and low stages. To select the
recommended airflow and for adjustments to the manual switches
labeled SW1, A/C and CF on the control board refer to the
furnace Installation, Start--Up, and Operating Instructions. The
315AAV utilizes a control center that allows the installing
technician to select the proper airflows.
The A/C switch
determines the airflow during high stage compressor operation.
Airflow for high-- and low--stage can be calculated at either 350
CFM per ton or 400 CFM per ton based on the positions of
SW1--5.
AIRFLOW SELECTION FOR FK4, FV4 FAN COILS FOR
24ANA7 MODELS ONLY USING NON--COMMUNICAT-
ING (NON--INFINITY) THERMOSTATS
The FK4 and FV4 provide high-- and low--stage blower operation
to match the capacities of compressor at high-- and low--stage. To
select recommended airflow, refer to the FK4 and FV4
Installation Instructions. The FK4 and FV4 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. This fan coil has an
adjustable blower off delay factory set at 90 sec. for high-- and
low--stage blower operation.
For other combinations of equipment consult the Product Data
Sheet.
When using communicating (Infinity) control, dipswitch
adjustments are not necessary.
Airflows are determined by
Infinity Control setup. This fan coil is the FE4A or FE5A.
STEP 11
—
Start--Up
CAUTION
!
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this caution may result in minor personal
injury, equipment damage or improper operation.
To prevent compressor damage or personal injury,
observe the following:
S
Do not overcharge system with refrigerant.
S
Do not operate unit in a vacuum or at negative pressure.
S
Do not disable low pressure switch
S
Dome temperatures may be hot in scroll and bottom
temperatures may be hot in recip.
CAUTION
!
ENVIRONMENTAL HAZARD
Failure to follow this caution may result in environmental
damage.
Federal regulations require that you do not vent
refrigerant to the atmosphere. Recover during system
repair or final unit disposal.
Follow these steps to properly start up the system:
1. After system is evacuated, fully back seat (open) liquid
and vapor service valves.
2. Unit is shipped with valve stem(s) front seated (closed)
and caps installed. Replace stem caps after system is
opened to refrigerant flow (back seated). Replace caps
finger--tight and tighten with wrench an additional 1/12
turn.
3. Close electrical disconnects to energize system.
4. Set room thermostat or User Interface at desired
temperature. Be sure set point is below indoor ambient
temperature and is set low enough to energize desired
stage.
5. Set room thermostat or User Interface to COOL and fan
control to ON or AUTO mode, as desired. Operate unit for
15 minutes. Check system refrigerant charge.
0
10
20
30
40
50
60
70
80
90
0
20
40
60
80
100
120
TEMPERATURE (DEG. F)
RESISTANCE (KOHMS)
THERMISTOR CURVE
A91431
Fig. 9
---
Resistance Values Versus Temperature
24AN
A