Rheem R-410A User Manual

12.2 Comfort Control
2
Control Wiring
T
he four 18AWG low voltage control wires must be installed from the thermostat to the
indoor unit and from indoor unit to the outdoor unit. The wire length between the thermo-
stat and indoor unit should not be greater than 100 feet. The wire length between the
indoor unit and outdoor unit should not be greater than 125 feet.
A serial communicating HVAC system consists of:
Serial communicating heat pump or serial communicating condensing unit
Serial communicating air handler or serial communicating furnace
Serial communicating thermostat
IIMMPPOORRTTAANNTT::
If the installed system does not meet these requirements, the sys-
tem must be wired using traditional control wiring, reference Section 12.7
Conventional 24VAC Thermostat Control Wiring.
The Comfort Control
2
requires four (4) control wires for unit operation:
R – 24VAC
C – 24VAC common
1 – Data wire 1
2 – Data wire 2
NNoottee::
Comfort Control
2
requires 18 AWG thermostat wire.
NNoottee::
Term dipswitches should be in “ON” position.
If the low voltage control wiring is run in conduit with the power supply, Class I insu-
lation is required. Class II insulation is required if run separate. Low voltage wiring
may be run through the insulated bushing provided in the 7/8 hole in the base
panel, up to and attached to the pigtails from the bottom of the control box. Conduit
can be run to the base panel if desired by removing the insulated bushing.
The serial communicating air handler or serial communicating furnace transformer
is equipped with a 24 volt, 50 VA transformer for proper system operation. See the
wiring diagram in Figure 5 for reference.
12.3 Comfort Control
2
ICC Control Operation
IInnssttaallllaattiioonn VVeerriiffiiccaattiioonn
• 24V AC power on R&C must be present at the ICC for it to operate
• Line voltage must be present at the ICC for the compressor and the outdoor fan
to operate
• The ICC displays a “0” for standby mode. Standby mode indicates line voltage
and 24VAC are present at the ICC and there is not a command for unit operation
from the serial communicating thermostat.
Zero (0) displayed
The unit is in standby
CCoommmmaanndd ffoorr CCoommpprreessssoorr OOppeerraattiioonn ((YY11 LLEEDD))
• If a command for compressor operation is received by the ICC (first stage/second
stage cooling or first stage/second stage heating), the red Y1 LED will illuminate.
• The ICC has an on/off fan delay of one (1) second for each stage of heating or
cooling.
• The ICC ignores the low pressure control for the first 90 seconds of compressor
operation.
• On heat pumps, the ICC ignores the LPC during the defrost cycle.
• The dual 7-segment LED displays five (5) operational status codes:
11)) FFiirrsstt SSttaaggee CCoooolliinngg OOppeerraattiioonn
– When the ICC receives a command for first
stage cooling operation, a lower case “c” is displayed on the dual 7-segment LEDs.
Lower case “c” indicates first stage cooling operation
22)) SSeeccoonndd SSttaaggee CCoooolliinngg OOppeerraattiioonn
– When the ICC receives a command for
second stage cooling operation, an upper case “C” is displayed on the dual 7-
segment LEDs.
2
Figure X – Typical Serial Communication Wiring Diagram
13.X Serial Communication ICC Control Operation
Installation Verification
• 24V AC power on R&C must be present at the ICC for it to operate
• Line voltage must be present at the ICC for the compressor and the outdoor fan to operate
• The ICC displays a “0” for standby mode. Standby mode indicates line voltage and 24VAC
are present at the ICC and there is not a command for unit operation from the serial
communicating thermostat.
Zero (0) displayed
The unit is in standby
Command for Compressor Operation (Y1 LED)
• If a command for compressor operation is received by the ICC (first stage/second stage
cooling or first stage/second stage heating), the red Y1 LED will illuminate.
• The ICC has an on/off fan delay of one (1) second for each stage of heating or cooling.
• The ICC ignores the lower pressure control for the first 90 seconds of compressor operation.
• On heat pumps, the ICC ignores the LPC during the defrost cycle.
• The 7-segment LED can display five (5) codes during a command for unit operation:
1) First Stage Cooling Operation – When the ICC receives a command for first stage
cooling operation, a lower case “c” is displayed on the 7-segment LEDs.
3
Lower case “c” indicates first stage cooling operation
2) Second Stage Cooling Operation – When the ICC receives a command for second stage
cooling operation, an upper case “C” is displayed on the 7-segment LEDs.
Upper case “C” indicates second stage cooling operation
3) First Stage Heating Operation - When the ICC receives a command for first stage
heating operation, “h1” is displayed on the 7-segment LEDs.
“h1” indicates first stage heating operation
4) Second Stage Heating Operation - When the ICC receives a command for second stage
heating operation, “h2” is displayed on the 7-segment LEDs.
“h2” indicates second stage heating operation
5) Defrost Operation – When the ICC starts a defrost cycle, a lower case “d” is displayed
on the 7-segment LEDs.
Lower case “d” indicates defrost operation (in heating mode)
3-minute Anti-short Cycle Timer
COMFORT CONTROL
2
SYSTEM™ CONTROL WIRING
19

Rheem R-410A Specifications

General

Brand	Rheem
Model	R-410A
Category	Heat Pump
Language	English