Product Overview

ManualsBrandsMaxitrol ManualsHeating SuppliesSignal Conditioner 2 Stage(0-10 vdc input/ 0-20 vdc output)

Additional relays and timers external to SC30 can be replaced

with TR1 - Timer Relay Control. See TR1_MI_EN.

Modulator and modulator-regulator valves are available up

to 5 psi (350 mbar) inlet pressure, 30,000 CFH (850 m3/h)

maximum, and pipe sizes from 3/8” to 4”. (For additional valve

information see Bulletin MMR_MT_EN, or consult your Maxitrol

sales representative.)

SC30 Series Signal Conditioners

READ PRIOR TO INSTALLATION: To Avoid Internal Damage to

SC30 Series Signal Conditioners Follow These Guidelines.

1. Transformer secondary must not be grounded in any portion

of the circuit external to the SC30 Series signal conditioners.

A separate, independent transformer is recommended.

2. Multiple SC30 Series signal conditioners controlled by a signal

source with common outputs (terminals 7 & 8) require separate

transformers for each SC30 Series signal conditioner.

3. Multiple SC30 Series signal conditioners powered by a single

transformer require independent signal inputs (terminals 7 &

8) to each SC30 Series signal conditioner.

For Indirect Fire Gas Applications Using 2-speed Inducers and 2-stage Gas Valves

Maxitrol Company

23555 Telegraph Rd., P.O. Box 2230

Southeld, MI 48037-2230 U.S.A.

www.maxitrol.com

SC30_MS_EN_09.2012

Figure 1: SC30 Series Signal Conditioner

SPECIFICATIONS

DIMENSIONS: 4.75“ W x 3.38“ H x 2.09“ D

SIGNAL CONDITIONER

Ambient Limits ................. -40º to 150ºF (-40º to 66ºC)

SIGNAL CONDITIONER POWER REQUIREMENTS

24 VAC transformer, 20 VA capacity (50/60 Hz).

(No grounded secondary.)

Figure 2: Wiring Diagram

DESCRIPTION

The track mounted SC30 Series controls three functions:

1) Converts a controller’s DC output signal of 0-10 volts to a

0-20 VDC signal to provide compatibility with Maxitrol’s M/MR

Series gas valves.

2) Controls the normally open relay used to switch inducer speed

and gas valve stage. Closes or opens the relay based on

controller’s DC output to the SC30.

Relay closes at approximately 5.3 VDC input

Relay opens at approximately 4.7 VDC input

3) Provides an adjustable timer SC30 (0-30 sec) or xed time,

SC30-XXX: specied in 15 second increments (beginning with

45 seconds - 045) and adjustable VDC (5-15 VDC) output to

the modulating gas valve on startup (powering of SC30). The

feature eliminates problems associated with lighting the burner

at its lowest gas input.

Adjustment potentiometers:

R18 0-30 second timer (SC30 only)

R22 5-15 VDC output voltage (All)