SS-SVN016A-EN
21
Air Handler to Condenser Connections
CCoonnttrrooll wwiirree —— TThheerrmmoossttaatt ssttyyllee wwiirree uupp ttoo sseevveenn ccoonndduuccttoorrss
Table 11. Pairing H air handler to condenser wiring
Cond. Required/
Optional
Air Handler
Connection
Condenser
Connection
Purpose
Instructions
1 Required (RB) J10-1 (AB) J15-1 24VAC It is recommended that the air handler and
condensing unit share low voltage power. If
the air handler and condensing unit have
separate low voltage power, these conductors
can be omitted, but isolation relays are
needed on the remaining control wire
conductors.
2 Required (RB) J10-2 (AB) J15-2 Ground
3 Required (RB) J5-4 (AB) J18-1 Supply fan Command the indoor fan to low speed.
4
Required (RB) J5-6
See
(a) (b) (c) (d) (e)
Supply fan
5 Optional (RB) J5-7 (UC) J21-3 Electric heat Commands first stage of electric heat (if
installed).
See “Symbio Service and Installation Mobile
Application,” p. 31 for details on how to use
the Symbio Service and Installation Mobile
App. Set Primary Heating Source to Not
Installed or a diagnostic for Options Module
Communication Fail will be active. The Symbio
700 will still command the Indoor Fan on with
a W1 or W2 call from the thermostat.
6 Optional (RB) J5-8 (UC) J21-5 Electric heat Commands second stage of electric heat (if
installed).
7 Optional (RB) J5-1 (UC) J16-2 EDC
If the EDC switch in the air handler will be
utilized for low evaporator compressor
protection, use the Symbio Service and
Installation Mobile Application to edit the
following:
• Edit Configuration: set Demand
Management to Demand Limit
• Edit Settings: Refrigeration set Cooling
Demand Limit Capacity Enable Setpoint
to 0%
(a)
Depending on the size of the condensing unit and the space reference, the termination on the Adapter Board will vary for the high-speed fan command.
This conductor will always terminate on Relay Board J5-6.
(b)
If the condensing unit only has one compressor, splice the connection into Adapter Board J7-1. This will command the indoor fan to high speed when
compressor contactor 1 (CC1) is energized.
(c)
If the condensing unit has two compressors, splice the connection into Adapter Board J7-3. This will command the indoor fan to high speed when
compressor contactor 2 (CC2) is energized.
(d)
If the condensing unit has two compressors and you are using a thermostat for a space reference, connect to the Y2 output from the thermostat. This will
command the indoor fan to high speed when a call for second stage of cooling is initiated. There is a chance of both compressors running with the fan on
low speed if the thermostat removes the Y2 call before the minimum compressor on timer has expired.
(e)
If the condensing unit is a 10 or 20 ton version, splice the connection into Adapter Board J12-1. This will command the indoor fan to high speed when both
compressors are fully loaded.
Symbio 700 Configuration and Settings
See “Symbio Service and Installation Mobile Application,” p. 31 for details on editing equipment
configuration. Review and edit the following:
• IInnddoooorr FFaann TTyyppee: When connecting the Symbio Condenser to an electromechanical air
handler with two-speed fan operation, ensure that the Symbio 700 UC indoor fan type
configuration is set to “Single Speed” selection. The air handler relay board will switch the
fan speeds based on the compressor operation / thermostat call.
• PPrriimmaarryy HHeeaattiinngg SSoouurrccee: If the air handler has electric heat, configure the Symbio 700 UC
for primary heating source to “Not Installed”, otherwise a Diagnostic for Options Module
Comm Fail will be active. The Symbio 700 will still turn the indoor fan on with a W1 or W2
call.
CCoonnddeennsseerr aanndd AAiirr HHaannddlleerr PPaaiirr WWiirriinngg IInnffoorrmmaattiioonn
To Next Page
Loading...