Manual

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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

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)

Summary of content (8 pages)

PAGE 1
Instructions Functions • Front • 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 setting 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.
PAGE 2
Model 90524A Triple limit or cold-start control — Instructions Where appliance instructions differ from this manual, follow the appliance instructions.
PAGE 3
Model 90524A Triple limit or cold-start control — Instructions Where appliance instructions differ from this manual, follow the appliance instructions. Configurations Model 90524A diagnostic LED’s • 90524A controls have three LED’s, as explained below. See following pages for operating sequence and LED behavior. • • Control kits — 90524A controls mount to a standard 4x4 J-box, supplied with the control. Mount the box directly to a well (new or existing) with hardware supplied, or panel mount.
PAGE 4
Model 90524A Triple limit or cold-start control — Instructions Where appliance instructions differ from this manual, follow the appliance instructions. Figure 3 Equivalent circuit diagram — Triple limit operation (LOW LIMIT on) Triple limit operation — Setup & adjustment • • [ Set low limit setpoint on front of control (item 9, page 2). Set low limit differential at the adjustment potentiometer on the back of the control (item 7, page 2). The differential range is shown on the control label.
PAGE 5
Model 90524A Triple limit or cold-start control — Instructions Where appliance instructions differ from this manual, follow the appliance instructions. Figure 5 Typical — Triple limit operation (LOW LIMIT ON) — Multi-zone controller, zoning with zone valves Carlin part number MN90524AM Rev.
PAGE 6
Model 90524A Triple limit or cold-start control — Instructions Where appliance instructions differ from this manual, follow the appliance instructions. Figure 6 –6– Typical — Triple limit operation (LOW LIMIT ON) — Multi-zone controller, zoning with circulators Carlin part number MN90524AM Rev.
PAGE 7
Model 90524A Triple limit or cold-start control — Instructions Where appliance instructions differ from this manual, follow the appliance instructions. Figure 7 Typical — Cold-start operation (LOW LIMIT OFF) — Delays circulator until boiler has heated above LOW TEMP setting Carlin part number MN90524AM Rev.