McQuay MHC Series, Installation & Maintenance Data, Page: 25 / 36

IM 985-1 / Page 25 of 36
Up button
Down button
Right (fan) button
Left (system) button
RC/RH Jumper
Field programming pins
Configuration switch
Reset switch
Specifications–668811201
Electrical rating: ­•­24­VAC­(18-30­VAC)
­ ­ •­1­amp­maximum­per­terminal
­ ­ •­3­amp­maximum­total­load
Temperature control range: ­45°F­to­90°F­(7°C­to­
32°C)­Accuracy:­±­1°F­(±­0 .5°C)
System configurations:
­1-stage­heat,­1-stage­cool,­heat­
pump
Timing: ­Anti-short­Cycle:­4­minutes­­
­ Backlight­Operation
Terminations: ­S1,­S2,­Y,­W/O/B,­G2,­G1,­RC,­RH,­C
For­detailed­installation,­operation­and­application­refer­
to­Operation­&­Application­Guide­LIAF014
Figure 18. Thermostat Parts Diagram - Part No. 668811201
Non-Programmable Electronic Thermostat
(P/N 668811201)
1 Heat/1 Cool, Auto Changeover, Fan Speed Control,
Hardwired
• Configurable
•­ Single-Stage­Heat/Cool­Systems
•­ Single-Stage­Heat­Pump­Systems
•­ Fan­Speed­Control
•­ Large­Display­With­Backlight
•­ Selectable­Fahrenheit­or­Celsius
•­ SimpleSet™­Field­Programming
•­ Status­Indicator­Light
•­ Relay­Outputs­(minimum­voltage­drop­in­thermostat)
•­ Remote­Sensor­Compatible
•­ Ideally­Suited­for:
­
–­Residential­(New­Construction/Replacement)
­ –­Light­Commercial
Specifications–668810301
Electrical rating: ­•­24­VAC­(18-30­VAC)
­ ­ •­1­amp­maximum­per­terminal
­ ­ •­3­amp­maximum­total­load
Temperature control range: ­45°F­to­90°F­(7°C­to­
32°C)­Accuracy:­±­1°F­(±­0 .5°C)
System configurations:
­1-stage­heat,­1-stage­cool,­heat­
pump
Timing: ­Anti-short­Cycle:­4­minutes
­ Backlight­Operation
Terminations: ­S1,­S2,­Y,­W/O/B,­G2,­G1,­RC,­RH,­C
For­detailed­installation,­operation­and­application­refer­
to­Operation­&­Application­Guide­LIA303
Figure 17. Thermostat Parts Diagram - Part No. 668811301
Reset switch
Up button
Down button
Right (fan) button
Left (system) button
RC/RH Jumper
Field programming pins
Configuration switch
Fan switch
Reset switch