Application Brochure

© 2013 553_A - 04/13
10 of 16
A Watts Water Technologies Company
1 Radiant Floor Heat / 1 Heat Pump / Relative Humidity
553_A-5
Description
The 553 operates a radiant floor as the first stage of heat and heat pump for second
stage heat and first stage cooling. The radiant floor can shut off during moderate outdoor
weather to allow only the heat pump to provide heating. The thermostat can operate
an optional humidifier or dehumidifier to maintain desired relative humidity settings. An
optional duct sensor provides freeze protection to the DX coil.
Setup Menu Essential
Setting
Sensor 1 DUCT
Y Relay HP
W Term OTHR
ACC Relay DHUM
G / O Relay O or B
Note: Assumes air handling unit operates
fan when Y or ACC are on.
ACC
Y
O
W
Outdoor
Sensor
070
553
Heat Pump
Fan
Boiler
Radiant Floor
Duct
Sensor
083
Wiring
Center