Carlin EZ-Temp 90524A - Manual

T
ech support
800-989-2275 carlincombustion.com
Functions
Carlin’s 90524A can be operated as either a triple limit control or a cold-start •
control, determined by the setting of the LOW LIMIT adjustment.
Triple limit operation (LOW LIMIT on): Provides adjustable high limit set- •
ting and maintains an adjustable minimum temperature in the boiler (low
limit setting) while in stand-by (no space heating call); used for tankless
heater applications. (See Figure 3 , page 4.)
Cold-start operation (LOW LIMIT off): Provides adjustable high limit set-
•
ting and low temperature protection (delays circulator start until the boiler
is heated above the fixed minimum temperature setpoint); used to prevent
condensation in the boiler on cold start. (See Figure 4 , page 4.)
The 90524A provides input from zone controllers or relays (ZR contact) and •
output to enable circulators (C1 contact) or zone controllers (ZC contact).
The gas valve/burner output is on the B1 terminal. Call for heat input is on
the T-T terminals.
Specifications
Carlin’s Model 90524A microprocessor-operated temperature controls are •
described below.
Refer to separate product listing sheets for pre-defined models, or request
•
a control to meet your specifications, within the available ranges listed
below.
Model 90524A
Input power (L1-L2) 120 VAC, 10 VA, 60 Hz
Control power (T-T) 24 VAC, 130 mA
High limit range Adjustable
High limit differential Adjustable (fixed if low limit is used or if
differential setpoint is OFF)
Low limit range Adjustable with OFF position
Low limit differential Adjustable (fixed if differential setpoint is
OFF)
Low temp function
Low temp differential
Fixed
Fixed
Temperature ranges
Setting —
Differential —
Any value/range between 50° & 250°
Any value/range between 5°F and 100°F
Contact ratings
Full load
Locked rotor
Burner, circulator and ZC contacts
120 VAC, 10 amps (total current on all
contacts not to exceed 16 amps)
120 VAC, 60 amps (total current on all
contacts not to exceed 96 amps)
Ambient temperature +32°F to +140°F (0°C to +60°C)
Storage temperature -40°F to +185°F (-40°C to +85°C)
Agencies UL Listed US and Canada
Instructions
Front
Rear
(size reduced)
Easy-wire terminal strip
Microprocessor-operated
(Processor coordinates operation and diagnostic)
Easy remote sense
(Electronic sensor, wired to control)
Self-checking program
(Control locks out on diagnostic failure)
Diagnostic/status LED’s
(LED’s indicate power, call for heat, and lockout)
SMC technology on burner relay
(lockout when welded contact sensed)