2025 QMark Digital Catalog

ADDITIONAL CONTROLS For Convector Heaters

CONVECTORS MARLEY CUSTOM CAPABILITIES

Two types of control sections are available: • Control sections are 28" long and available in 7" high and 14" high steel models, as well DBA and SHA aluminum models

• An SCR control section which may include one or combinations of Master and Slave SCR's with an SCR type thermostat, or a Control Transformer

To develop a complete catalog number, first start with the catalog number of the selected Blank Control Section. Then add slash marks to separate the catalog numbers that describe the individual controls desired. Also specify finish, heater voltage, phase 1 or 3, and control voltage. All control sections are fully custom, factory made-to-order per application and therefore, all mounting locations, incoming power locations etc, must be verified by MEP engineering. Example : CSH07BCS1/TR24/2CB3P30. This example catalog number would be for a 7-inch Commercial Style Grille Steel Convector control section with a 24v transformer relay, two 3-pole 30 amp Circuit Breakers.

Blank Control Section 1 : CATALOG NO. DESCRIPTION

Circuit Breakers 2 : CATALOG NO.

SIZE

INLET / OUTLET

DESCRIPTION

AMPERAGE VOLTAGE

DBA3BCSF

3 5/8 x 6 x 28 in.

Front Inlet

1CB2P30

(1) Three-Pole Circuit Breaker

30 Amps

Aluminum Draft Barrier Style Control Section

DBA3BCSB

3 5/8 x 6 x 28 in.

Bottom Inlet

1CB2P60

(1) Two-Pole Circuit Breaker

60 Amps

SHABCSF

5 3/8 x 7 x 28 in.

Front Inlet

1CB3P30

(1) Three-Pole Circuit Breaker

30 Amps

SHABCSB

5 3/8 x 7 x 28 in.

Bottom Inlet

1CB3P60

(1) Three-Pole Circuit Breaker

60 Amps

208, 240, 277 VAC

CSH07BCS1

7 in. High

Bottom Inlet/Top Outlet

2CB2P30

(2) Two-Pole Circuit Breaker

30 Amps

CSH14BCS1

14 in. High

Bottom Inlet/Top Outlet

2CB2P60

(2) Two-Pole Circuit Breaker

60 Amps

Steel Commercial Style Control Section

CSH14BCS3

14 in. High

Bottom Inlet/Front Outlet

2CB3P30

(2) Three-Pole Circuit Breaker

30 Amps

DSH07BCS1

7 in. High

Bottom Inlet/Top Outlet

2CB3P60

(2) Three-Pole Circuit Breaker

60 Amps

DSH14BCS1

14 in. High

Bottom Inlet/Top Outlet

DSH07BCS2

7 in. High

Front Inlet/Top Outlet

SCR Controls 2 – Lead:

Steel Decorative Style Control Section

DSH14BCS2

14 in. High

Front Inlet/Top Outlet

CATALOG NO.

DESCRIPTION

Control Transformer, 50 VA Rating:

Lead SCR Control Rated 25 Amps @120 – 480V AC. Lead units accept 0-10V DC, 4-20mA, or 135 OHM proportional control inputs. Each Lead SCR can provide low voltage signal to Follower SCR(s) 4

M90525A

CATALOG NO.

DESCRIPTION

M90548A

Lead SCR Control Rated 48 Amps @120 – 480V AC

TR24

240/208V Primary, 24V Secondary Step Down Transformer

M90548A-2

3-phase Lead SCR Control Rated 48 Amps @120 – 480V AC

TR27

277V Primary, 24V Secondary Step Down Transformer

SCR Controls 2 – Follower:

Thermostat & Receptacle:

CATALOG NO.

DESCRIPTION

CATALOG NO.

DESCRIPTION

S90525A

SCR Follower unit controller. Rated 25 Amps.

Single-Pole Pilot Duty Thermostat, 60°-120°F Temperature Range– 125 VA Rating Two-Stage Pilot Duty Thermostat, 60°-120°F Temperature Range– 125 VA Rating. Available on 2- or 3-element, single-phase heaters only. Two-Stage Thermostat 60-120°F temperature range, adjustable through outlet grille-tamper-resistant. Available on 2- or 3-element, single phase heaters only. 120V Receptacle Duplex receptacle, 120V/20A, mounting in left or right end cap of Steel Convectors only. For Alum. Convectors verify locations with factory.

1PDT

S90548A

SCR Follower unit controller. Rated 48 Amps

2PDT

SCR Thermostat 4 :

CATALOG NO.

DESCRIPTION

2ST

Provides a proportional 2–10 VDC output for controlling 0–100% of the connected load to each Lead SCR 4.

T90613V

R

NOTE: Each SCR incorporates its own zero-firing logic, providing any combination or connection arrangement for single or three phase applications. 25A single phase SCR can be mounted in the SHA aluminum convector. Each Master and Thermostat will require 24V AC Transformer. Specify holding coil voltage where applicable. On all 5 in. high steel convectors the two-pole thermostat must go in the right hand junction box (TR must mount in RH junction box. 2T+TR are invalid in 5 in. high steel convectors). (1) Blank control sections are subject to the same color selections and pricing as the appropriate matching heater. (2) Not available in DBA control sections. (4) Maximum of 8 SCRs is the limit for one thermostat output signal.

Power On/Off Switch:

CATALOG NO.

DESCRIPTION

Pilot Duty Power On/Off Switch; Double-Pole (Disconnects relay holding coil circuit)

DS

160 | Convectors

For more information visit MarleyMEP.com/Products/Convector-Heaters

rev: Nov 2025