Honeywell T775 Series 2000 Application Manual page 54

Features 150
One Stage
T775A2009
Setpoint Control

Adjustable Minimum Off Time
Auto Differential
Boiler Demand
 
Built-in Display
Combustion Air or Alarm Contact
DHW Control

Digital Input for Setback or Disable
Equal Run Time
External Input 0-10Vdc or 2-10Vdc
First On / First Off Rotation
First On/ Last OFF Rotation
Fixed Last Rotation
Fixed Lead Rotation
Floating Output
Integral Voltage Options

Irreversible High Set Point Limit
Lo/ Hi or Hi/ Lo staging
Modulating Outputs
Nema 4x Models
Optional Input Sensor
Outdoor Reset
Power Supply Voltage 20 to 28 Vac 24, 120, 240 Vac
Pump Exercising
Pump Purging

PWM Mode
Relay Rating 24 Vac 24, 120, 240 Vac
Relay Outputs 1 SPDT 1 SPDT

Sensor Calibration
Sensor Inputs 1 1
Ω Ω
Sensor Type
10k at 77°F 1097 at 77°F
Time Clock with Setback

Adjustable Interstage Delay

Warm Weather Shut Down
1
can be configured with up to two T775S expansion modules for a maximum of 12 stages
2
if staging 4 relays and a pump output add one T775S2008 expansion module
3
if staging 9 relays and a pump output add two T775S2008 expansion modules
Table 7. Cross Reference. (Continued)
152 256
Two Stage T775B2032 One Stage T7775P2003
Setpoint Control Boiler Control
 

 use DI
   
Digital Output for
Alarm
 
Boiler Demand





Type based
 
(T775M2048)
(T775B2016)
 
20 to 28 Vac 24, 120, 240 Vac 24Vac 24, 120, 240 Vac 24, 120, 240 Vac


24 Vac 24, 120, 240 Vac 24, 120, 240 Vac 24, 120, 240 Vac 24, 120, 240 Vac 24, 120, 240 Vac 24, 120, 240 Vac 24, 120, 240 Vac 24, 120, 240 Vac 24, 120, 240 Vac 24, 120, 230 Vac 24, 120, 240 Vac 24, 120, 230 Vac 24, 120, 240 Vac
2 SPST 2 SPDT 1 SPST 4 SPDT


2 2 2 3
Ω Ω Ω Ω
10k at 77°F 1097 at 77°F 10k at 77°F 1097 at 77°F 1097
need external timer
 
(tekmar Timer 031)
 
 
Tekmar Model & T775 Cross
260
T775R2035 One Stage Boiler T7775P2003 T775R2035
& DHW Control
  

use DI  use DI use DI
   
Digital OutPut for
Alarm

  
Boiler Demand



 

Type based
  
T775R2027 T775R2027

   
120 Vac 24, 120, 240 Vac 24, 120, 240 Vac
 

2 SPDT 1 SPST 4 SPDT 2 SPDT
  
2 3 3 2
Ω Ω Ω Ω
at 77°F 10k at 77°F 1097 at 77°F 1097 at 77°F
need external timer
  
(tekmar Timer 031)
 
 
264
262
Our Stage
Two Stage Boiler & T7775P2003 T775P2003
Boiler & DHW
DHW Control
Control
 
 
  use DI
   
Digital Output for Digital Output for
Both
Alarm Alarm
 
 
Boiler Demand Boiler Demand
   

  
  


 
Type based Type based
 


   
120 Vac 24, 120, 240 Vac 115 Vac 24, 120, 240 Vac
   
   
2
2 SPST 4 SPDT 4 SPST
4 SPDT
 
5 3 3 3
Ω Ω Ω Ω
10k at 77°F 1097 at 77°F 10k at 77°F 1097 at 77°F
need external timer need external timer
 
(tekmar Timer 031) (tekmar Timer 031)
   
   
268
Nine Stage T775P2003 & (2)
Boiler & DHW T775S2008
Control


 use DI
 
Digital Output for
Both
Alarm


Boiler Demand
 

 
 



Type based


 
115 Vac 24, 120, 240 Vac
 
 
3
9
12 SPDT

3 3
Ω Ω
10k at 77°F 1097 at 77°F
need external timer

(tekmar Timer 031)
 
 