York LY8S User Manual

Page 7

036-21618-003 Rev. A (1205)

Unitary Products Group

For additional connection diagrams for all UPG equipment refer to “Low Voltage System Wiring” document available online at
www.upgnet.com in the Product Catalog Section.

Thermostat Chart

AC1

Single Stage A/C w/Single Stage Furnace, 1 Stage Cooling Ready - (G,L)*8/9S, XYF80-U, XYF80-U*L, XYF90-U

HM1

Humidistat

Thermostat Installer Setup Number 1 -

System Type - must be set to 0

Selection of GAS/ELEC switch

on thermostat not necessary

Thermostat Installer Setup Number 15 -

Compressor Protection - must be set to 5

24V HUMIDIFIER

Fan

First Stage Heat

Single Stage Heat

24-Volt Hot (Cool XFMR)

24-Volt Hot (Heat XFMR)

24-Volt Hot

24-Volt Common

First Stage Cool

Y/Y2

Single/Second Stage Cool

Single Stage Cool

*DN11C00124

24-Volt Common

Optional w/Batteries

*BN11C01124

*DP11C40124

PSC

FURNACE CONTROL

SINGLE STAGE

AIR CONDITIONING

*BN11C00124

*BP11C50124

*PP11C70224

THERMOSTAT

HP1

W/031-01975- Series Demand Control

Single Stage H/P - E*RD, E*BD, ERHS, HPX13 - w/Single Stage Furnace, 1 Stage Cooling Ready - (G,L)*8/9S, XYF80-U, XYF80-U*L, XY

F90-U

SINGLE STAGE

HEAT PUMP

*DN22U00124

*BP21H50124

*PP32H70124

THERMOSTAT

PSC

FURNACE CONTROL

*BN21H00124

*DP21H40124

*DN21H00124

N/A

24-Volt Common

24-Volt Hot

Emergency Heat

Reversing Valve–Energized in Cool

24-Volt Common

First Stage Heat/Cool

Y/Y2

Single/Second Stage Cool

Single Stage Heat/Cool

24-Volt Hot

Second Stage Heat

Single Stage Heat

W1/66

First Stage Heat Out

Fan

First Stage Heat

Step 1 of Thermostat User Configuration Menu

must be set to Heat Pump 1

Step 9 of Thermostat User Configuration Menu

must be set to Pump OFF

Reversing Valve–Energized in Cool

Malfunction Light

X/L

Malfunction Light