Product Overview

UNIVERSAL CONTROL MODEL UC1 HIGHLIGHTS
Over time, Tjernlund Products has developed a variety of built-in and accessory interlock controls to match
the needs of different boiler, furnace, and water heater control systems. As the years went by we expanded
the number of power venter models to include a variety of these interlock controls. This led wholesalers to
stock those versions that sold best in their market and special order those variations of the same size power
venter that included a different type or voltage control system. In order to simplify product selection, and at
the same time update our products with a host of new features, we are introducing a new Universal Control
(UC1). It will be the standard interlock used for all of our products with a motor horsepower rating of 1 HP
and less.
The Universal Control (UC1) interlocks mechanical draft and combustion air systems with gas/oil fired heat-
ing equipment. It can be activated by any 18-130 VAC heater control signal or by a pressure switch or relay
using the 5 VDC Control supplied dry contacts.
The UC1 features:
Adjustable pre & post purge
LED status/diagnostic indicators
Selectable voltage to avoid false triggering by electronic burner controls
Prover switch check circuit to verify that the fan prover switch is open prior to operation
A 10-second prover switch delay to eliminate burner start up or wind induced prover switch short cycling
A 5 VDC Control supplied fan prover signal that isolates the burner load circuit from the prover switch circuit
As of July 22, 2002 the following revised models will incorporate the UC1 as their standard interlock control:
HSJ, HS1, HS2, HS3, HS4, HS5
SS1, SS2 (In addition the SS2 also gets a new fan prover)
The following models will be discontinued after July 22, 2002:
HS115-J, HS115-1, HS115-2, HST-J, HST-1, HST-2, GPAK-J, GPAK-1, GPAK-JT, GPAK-1T & SS2G. The
models HSUL-J, HSUL-1, & HSUL-2 will still be available through 2002.
The UC1 will be the standard (optional) accessory interlock control for the following models:
DJ-3, D-3, I, IL, XL (These models will still require the PS1505 Fan Proving Switch)
PAI-3, PAI-4, PAI-5, PAI-6, PAI-7
Interlocking the UC1 with multiple or millivolt appliances:
New millivolt and multiple heater interlock controls that end with "E" will be similar to previous versions, but
designed to easily interface with the UC1 control.
To interlock with one additional 24/115 VAC heater add the new MAC-1E. It is a stripped down auxiliary
board version of the UC1 and is powered by and communicates with the UC1 through a factory-wired whip.
To interlock with a millivolt water heater only, add the WHK-E water heater interlock kit.
To interlock a millivolt water heater and a 24/115 VAC furnace or boiler, add the WHK-E and the MAC-1E.
To interlock more than two 24/115 VAC heaters add the MAC-4E for a total of up to 5 heaters. It is powered
by and communicates with the UC1 through a factory wired whip.
TJERNLUND PRODUCTS, INC.
1601 Ninth Street • White Bear Lake, MN 55110-6794
PHONE [phone] • [phone] • FAX [phone]
Visit our web site • www.tjernlund.com