TJERNLUND, Switch, models:

950-2080 NEW STYLE GAS PRESSURE SWITCH	Manual
PS1503 DUCT AIRSTAT FAN PROVING SWITCH REV A 1099	Manual
PS1503 DUCT BOOSTER FAN SWITCH 8500130 REV A 0499	Dimensions
PS1505 FAN PROVER 8504008 REV 1 0197	Owner'S Instructions
PS1505 IN-LINE DRAFT INDUCER FAN PROVING SWITCH 8500135 REV 1 1296	Manual
PS2501 FAN PROVING SWITCH	Manual
WHKE MILLIVOLT INTERLOCK KIT (COMPATIBLE WITH UC1 CONTROL) 8504108 REV 0802	Installation Manual